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2014-03-31Merge branch 'for-next' into for-linusTakashi Iwai714-14253/+30599
2014-03-31ALSA: hda - Enable beep for ASUS 1015EW. Trevor King1-0/+1
The `lspci -nnvv` output contains (wrapped for line length): 00:1b.0 Audio device [0403]: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller [8086:1e20] (rev 04) Subsystem: ASUSTeK Computer Inc. Device [1043:115d] Signed-off-by: W. Trevor King <wking@tremily.us> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-31ALSA: asihpi: fix some indenting in snd_card_asihpi_pcm_new()Dan Carpenter1-4/+5
This used to be a part of a condition until f3d145aac913 ('ALSA: asihpi: MMAP for non-busmaster cards') but now it's not and we can remove an indent level. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-26ALSA: hda - add headset mic detect quirks for three Dell laptopsHui Wang1-0/+3
When we plug a 3-ring headset on the Dell machines (VID: 0x10ec0255, SID: 0x10280632; VID: 0x10ec0293, SID: 0x1028062c; VID: 0x10ec0293, SID: 0x1028062e), the headset mic can't be detected, after apply this patch, the headset mic can work well. BugLink: https://bugs.launchpad.net/bugs/1297581 Cc: David Henningsson <david.henningsson@canonical.com> Cc: stable@vger.kernel.org Signed-off-by: Hui Wang <hui.wang@canonical.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-25ALSA: hda - Inform the unexpectedly ignored pins by auto-parserTakashi Iwai1-5/+25
The auto-parser may ignore some pins that could be valid when they don't match with the assumption or if there are way too many pins assigned to the same output type. So far, such a pin has been silently ignored, but it's better to leave a message, which would help for debugging and understanding the problem. Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-24Merge tag 'asoc-v3.15-3' of ↵Takashi Iwai197-1247/+2528
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-next ASoC: Updates for v3.15 A few more updates for the merge window: - Fixes for the simple-card DAI format DT mess. - A new driver for Cirrus cs42xx8 devices. - DT support for a couple more devices. - A revert of a previous buggy fix for soc-pcm, plus a few more fixes and cleanups.
2014-03-23Merge remote-tracking branches 'asoc/topic/simple' and 'asoc/topic/sirf' ↵Mark Brown3-33/+62
into asoc-next
2014-03-23Merge remote-tracking branch 'asoc/topic/rcar' into asoc-nextMark Brown7-3/+334
2014-03-23Merge remote-tracking branches 'asoc/topic/max98090' and 'asoc/topic/omap' ↵Mark Brown3-4/+1
into asoc-next
2014-03-23Merge remote-tracking branches 'asoc/topic/intel', 'asoc/topic/io' and ↵Mark Brown5-64/+60
'asoc/topic/kirkwood' into asoc-next
2014-03-23Merge remote-tracking branch 'asoc/topic/davinci' into asoc-nextMark Brown4-19/+106
2014-03-23Merge remote-tracking branch 'asoc/topic/cs42xx8' into asoc-nextMark Brown6-0/+946
2014-03-23Merge remote-tracking branch 'asoc/topic/codecs' into asoc-nextMark Brown8-43/+20
2014-03-23Merge remote-tracking branch 'asoc/topic/core' into asoc-nextMark Brown1-0/+13
2014-03-23Merge tag 'asoc-v3.15-2' into asoc-nextMark Brown109-795/+1958
ASoC: Updates for v3.15 This is mostly a few additional fixes from Lars-Peter, a new driver and cleaning up a git failure with merging the Intel branch (combined with an xargs failure to pay attention to error codes). The history lists a bunch of additional commits for the branch but the content of those commits is actually present already but not recorded in history due to git failing. Unfortunately xargs is used in the merge script and it doesn't do a good job of noticing errors from the commands it invokes. # gpg: Signature made Thu 13 Mar 2014 14:25:44 GMT using RSA key ID 7EA229BD # gpg: Good signature from "Mark Brown <broonie@sirena.org.uk>" # gpg: aka "Mark Brown <broonie@debian.org>" # gpg: aka "Mark Brown <broonie@kernel.org>" # gpg: aka "Mark Brown <broonie@tardis.ed.ac.uk>" # gpg: aka "Mark Brown <broonie@linaro.org>" # gpg: aka "Mark Brown <Mark.Brown@linaro.org>"
2014-03-23Merge tag 'asoc-v3.15' into asoc-nextMark Brown215-4560/+17516
ASoC: Updates for v3.15 Quite a busy release for ASoC this time, more on janitorial work than exciting new features but welcome nontheless: - Lots of cleanups from Takashi for enumerations; the original API for these was error prone so he's refactored lots of code to use more modern APIs which avoid issues. - Elimination of the ASoC level wrappers for I2C and SPI moving us closer to converting to regmap completely and avoiding some randconfig hassle. - Provide both manually and transparently locked DAPM APIs rather than a mix of the two fixing some concurrency issues. - Start converting CODEC drivers to use separate bus interface drivers rather than having them all in one file helping avoid dependency issues. - DPCM support for Intel Haswell and Bay Trail platforms. - Lots of work on improvements for simple-card, DaVinci and the Renesas rcar drivers. - New drivers for Analog Devices ADAU1977, TI PCM512x and parts of the CSR SiRF SoC. # gpg: Signature made Wed 12 Mar 2014 23:05:45 GMT using RSA key ID 7EA229BD # gpg: Good signature from "Mark Brown <broonie@sirena.org.uk>" # gpg: aka "Mark Brown <broonie@debian.org>" # gpg: aka "Mark Brown <broonie@kernel.org>" # gpg: aka "Mark Brown <broonie@tardis.ed.ac.uk>" # gpg: aka "Mark Brown <broonie@linaro.org>" # gpg: aka "Mark Brown <Mark.Brown@linaro.org>"
2014-03-23Merge remote-tracking branches 'asoc/fix/cs42l51', 'asoc/fix/cs42l52', ↵Mark Brown17-46/+29
'asoc/fix/cs42l73', 'asoc/fix/rcar', 'asoc/fix/spear' and 'asoc/fix/tegra' into asoc-linus
2014-03-23ASoC: pcm: Drop incorrect double/extra freesMark Brown1-3/+0
The changes in "ASoC: pcm: free path list before exiting from error conditions" actually introduced both double frees (in case where the path list was allocated but empty) and frees of unallocated memory (in cases where the error being handled was -ENOMEM. Drop the commit for now. Fixes: e4ad1accb (ASoC: pcm: free path list before exiting from error conditions) Reported-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Mark Brown <broonie@linaro.org> Cc: stable@vger.kernel.org
2014-03-21ASoC: mfld_machine: Fix compile errorLars-Peter Clausen1-1/+1
Fixes: 115f3f8 ("ASoC: mfld_machine: Convert to table based DAPM and control setup") Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-21ASoC: rsnd: add DeviceTree supportKuninori Morimoto7-3/+334
Support for loading the Renesas R-Car sound driver via DeviceTree. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-21ASoC: mfld_machine: Convert to table based DAPM and control setupLars-Peter Clausen1-29/+20
Use table based setup to register the controls and DAPM widgets and routes. This on one hand makes the code a bit cleaner and on the other hand the board level DAPM elements get registered in the card's DAPM context rather than in the CODEC's DAPM context. The mfld_machine driver is a bit special in that it directly writes to one of the CODEC registers from one of the control handlers. Previous to this patch it was able to get a pointer to the CODEC from the control, since the control was registered with the CODEC. This won't be possible anymore once the control is registered with the card. Since there are already global variables in the driver accessed in the same function the patch adds a global variable that holds a pointer to the CODEC and uses that. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-20ASoC: cs42xx8: Add codec driver support for CS42448/CS42888Nicolin Chen6-0/+946
This patch adds support for the Cirrus Logic CS42448/CS42888 Audio CODEC that has six/four 24-bit AD and eight 24-bit DA converters. [ CS42448/CS42888 supports both I2C and SPI control ports. As initial patch, this patch only adds the support for I2C. ] Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com> Acked-by: Brian Austin <brian.austin@cirrus.com> Acked-by: Paul Handrigan <Paul.Handrigan@cirrus.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-20ALSA: hda - verify pin:cvt connection on preparing a stream for Intel HDMI codecMengdong Lin1-0/+32
This is a temporary fix for some Intel HDMI codecs to avoid no sound output for a resuming playback after S3. After S3, the audio driver restores pin:cvt connection selections by snd_hda_codec_resume_cache(). However this can happen before the gfx side is ready and such connect selection is overlooked by HW. After gfx is ready, the pins make the default selection again. And this will cause multiple pins share a same convertor and mute control will affect each other. Thus a resumed audio playback become silent after S3. This patch verifies pin:cvt connection on preparing a stream, to assure the pin selects the right convetor and an assigned convertor is not shared by other unused pins. Apply this fix-up on Haswell, Broadwell and Valleyview (Baytrail). We need this temporary fix before a reliable software communication channel is established between audio and gfx, to sync audio/gfx operations. Signed-off-by: Mengdong Lin <mengdong.lin@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-20ASoC: tegra: Use flat regcacheDylan Reid6-7/+7
When using an rbtree cache, there can be allocations the first time a register is accessed. This can cause an attempt to schedule while atomic in the case that the regmap is using a spinlock. This could be fixed by either initializing all the registers or using a flat cache. The register maps for tegra30_ahub and tegra30_i2s are dense and don't save much from using a tree so convert them to flat. Tegra30 changes tested on Norrin, Tegra20 changes compile. Signed-off-by: Dylan Reid <dgreid@chromium.org> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-19ASoC: cs42l51: Fix SOC_DOUBLE_R_SX_TLV shift values for ADC, PCM, and Analog ↵Brian Austin1-5/+4
kcontrols The shift values for the ADC,PCM, and Analog kcontrols were wrong causing wrong values for the SOC_DOUBLE_R_SX_TLV macros Fixed the TLV for aout_tlv to show -102dB correctly Fixes: 1d99f2436d (ASoC: core: Rework SOC_DOUBLE_R_SX_TLV add SOC_SINGLE_SX_TLV) Reported-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Brian Austin <brian.austin@cirrus.com> Signed-off-by: Mark Brown <broonie@linaro.org> Cc: stable@vger.kernel.org
2014-03-19ALSA: compress: Pass through return value of open ops callbackCharles Keepax1-1/+1
The snd_compr_open function would always return 0 even if the compressed ops open function failed, obviously this is incorrect. Looks like this was introduced by a small typo in: commit a0830dbd4e42b38aefdf3fb61ba5019a1a99ea85 ALSA: Add a reference counter to card instance This patch returns the value from the compressed op as it should. Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-19ASoC: io: Remove support for ASoC cache in conjunction with regmapMark Brown1-31/+4
Since all regmap CODECs should be (and are) using the more advance regmap cache infrastructure remove the code which supports that and just proxy I/O straight through to regmap. Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-19ASoC: Add helper function to cast component back to CODECLars-Peter Clausen1-0/+13
Add a helper function to cast back from a component struct to the CODEC struct it is embedded in. This is useful in situations where we know that a certain component is a CODEC and want to get access to some CODEC specific properties. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-19ASoC: simple-card: overwrite cpu_dai->fmt with codec_dai->fmtNicolin Chen2-6/+20
The current simple-card driver separates the daimft for cpu_dai and codec_dai. So we might get different values for them (0x4003 and 0x1003 for example): asoc-simple-card sound-cs42888.12: cpu : 2024000.esai / 4003 / 132000000 asoc-simple-card sound-cs42888.12: codec : cs42888 / 1003 / 24576000 asoc-simple-card sound-cs42888.12: cs42888 <-> 2024000.esai mapping ok This is not allowed at all as we need to keep the DAIFMT settings identical for both the ends of the link. Thus this patch fixes it by overwriting the cpu_dai->fmt with codec_dai->fmt since we defined the DAIFMT_MASTER basing on CODEC at the first place while the other bits are same. Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-18ASoC: cs42l52: Fix mask bits for SOC_VALUE_ENUM_SINGLEBrian Austin1-4/+4
The mask bits values were wrong for the SOC_VALUE_ENUM_SINGLE for the PCM/ADC Swap controls Reported-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Brian Austin <brian.austin@cirrus.com> Signed-off-by: Mark Brown <broonie@linaro.org> Cc: stable@vger.kernel.org
2014-03-18ASoC: cs42l73: Fix mask bits for SOC_VALUE_ENUM_SINGLEBrian Austin1-3/+3
The mask bits values were wrong for the SOC_VALUE_ENUM_SINGLE for the mono mix controls. Reported-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Brian Austin <brian.austin@cirrus.com> Signed-off-by: Mark Brown <broonie@linaro.org> Cc: stable@vger.kernel.org
2014-03-18ASoC: add S/PDIF support to Armada 370 DB ASoC driverThomas Petazzoni3-3/+35
The Armada 370 DB board not only has analog audio input/output, but also S/PDIF input/output. This commit adds support for S/PDIF in the ASoC machine driver of the Armada 370 DB platform, and adjusts the Device Tree bindings documentation accordingly. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-18ASoC: codecs: Replace instances of rtd->codec with dai->codecLars-Peter Clausen8-19/+10
With CODEC to CODEC links rtd->codec does not necessarily point to the driver's CODEC. CODEC drivers should always use dai->codec and never even look at the PCM runtime. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Acked-by: Jyri Sarha <jsarha@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-18ASoC: tlv320aic31xx: Don't call kfree for memory allocated by devm_kzallocAxel Lin1-8/+3
The kfree call is not necessary, but we need to call snd_soc_unregister_codec() in remove(). Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Jyri Sarha <jsarha@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-18Merge branch 'topic/alc28x' into for-nextTakashi Iwai1-0/+77
2014-03-18ALSA: hda/realtek - Restore default value for ALC282Kailang Yang1-0/+77
Restore the registers to prevent the abnormal digital power supply rising ratio/sequence to the codec and causing the incorrect default codec register restoration during initialization. Signed-off-by: Kailang Yang <kailang@realtek.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-18ALSA: oxygen: Xonar DG(X): fix Stereo Upmixing regressionClemens Ladisch1-6/+24
The code introduced in commit 1f91ecc14dee ("ALSA: oxygen: modify adjust_dg_dac_routing function") accidentally disregarded the old value of the playback routing register, so it broke the "Stereo Upmixing" mixer control. The unmuted parts of the channel routing are the same for all settings of the output destination, so it suffices to revert that part of the patch. Fixes: 1f91ecc14dee ('ALSA: oxygen: modify adjust_dg_dac_routing function') Tested-by: Roman Volkov <v1ron@mail.ru> Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-18Merge branch 'topic/alc28x' into for-nextTakashi Iwai1-0/+177
2014-03-18ALSA: hda/realtek - Fix the noise after suspend and resume on ALC282 codecKailang Yang1-0/+73
When the power state of ALC283 codec goes to D3 or return back to D0, it gives a noise via headphone output. To follow the depop procedure, it will be better. Signed-off-by: Kailang Yang <kailang@realtek.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-18ALSA: hda/realtek - Restore default value for ALC283Kailang Yang1-0/+85
Restore the registers to prevent the abnormal digital power supply rising ratio/sequence to the codec and causing the incorrect default codec register restoration during initialization. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=71861 Signed-off-by: Kailang Yang <kailang@realtek.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-03-17ASoC: sirf-audio-codec: Remove snd_soc_codec_set_cache_io() callLars-Peter Clausen1-9/+0
There was a overlap between the snd_soc_codec_set_cache_io() cleanup and the addition of the sirf-audio-codec resulting in the sirf-audio-codec driver still using the old signature of snd_soc_codec_set_cache_io(), which will cause a compile error. Since the core is able to automatically setup IO for this driver we can just remove both the snd_soc_set_cache_io() call and the control_data assignment. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-17ASoC: simple-card: Simplify codeJean-Francois Moine1-5/+5
The global DAI format is used only in the function asoc_simple_card_parse_of(). So, move it from the private data to the stack. Signed-off-by: Jean-Francois Moine <moinejf@free.fr> Reviewed-by: Xiubo Li <Li.Xiubo@freescale.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-17ASoC: davinci-mcasp: Provide correct filter_data for dmaengine for non-DT bootPeter Ujfalusi1-5/+16
When we boot with non-DT mode the damengine will need the channel number and a filter function in order to get the channel. The filter_data is filled in the DAI driver while the filter_function will be provided by the edma-pcm driver. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-17ASoC: davinci: Add edma dmaengine platform driverPeter Ujfalusi2-0/+82
Platform driver glue for SoC using eDMA3 to use dmaengine PCM. The maximum number of periods need to be limited to 19 since the edma dmaengine driver limits the paRAM slot use for audio at in cyclic mode. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-17ASoC: fsi: fixup compile error for simple-cardKuninori Morimoto1-1/+1
This patches fixes c7a507eea1db1430476289f525f9c853d5d485e8 (ASoC: fsi: fixup SND_SOC_DAIFMT_CBx_CFx flags) commit's compie error arch/arm/mach-shmobile/board-mackerel.c:512:2: \ error: unknown field 'fmt' specified in initializer Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Acked-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-17ASoC: tlv320aic31xx: Turn power off only once.Jyri Sarha1-1/+2
Regulator code keep count of enables and disables. Double disable causes an ugly warning. Signed-off-by: Jyri Sarha <jsarha@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-03-17Linux 3.14-rc7Linus Torvalds1-1/+1
2014-03-16Merge branch 'sched-urgent-for-linus' of ↵Linus Torvalds3-3/+12
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler fixes from Ingo Molnar: "Three small fixes" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/clock: Prevent tracing recursion in sched_clock_cpu() stop_machine: Fix^2 race between stop_two_cpus() and stop_cpus() sched/deadline: Deny unprivileged users to set/change SCHED_DEADLINE policy
2014-03-16Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds4-6/+15
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf fixes from Ingo Molnar: "Misc smaller fixes" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86: Fix leak in uncore_type_init failure paths perf machine: Use map as success in ip__resolve_ams perf symbols: Fix crash in elf_section_by_name perf trace: Decode architecture-specific signal numbers
2014-03-16ipc: Fix 2 bugs in msgrcv() MSG_COPY implementationMichael Kerrisk1-0/+2
While testing and documenting the msgrcv() MSG_COPY flag that Stanislav Kinsbursky added in commit 4a674f34ba04 ("ipc: introduce message queue copy feature" => kernel 3.8), I discovered a couple of bugs in the implementation. The two bugs concern MSG_COPY interactions with other msgrcv() flags, namely: (A) MSG_COPY + MSG_EXCEPT (B) MSG_COPY + !IPC_NOWAIT The bugs are distinct (and the fix for the first one is obvious), however my fix for both is a single-line patch, which is why I'm combining them in a single mail, rather than writing two mails+patches. ===== (A) MSG_COPY + MSG_EXCEPT ===== With the addition of the MSG_COPY flag, there are now two msgrcv() flags--MSG_COPY and MSG_EXCEPT--that modify the meaning of the 'msgtyp' argument in unrelated ways. Specifying both in the same call is a logical error that is currently permitted, with the effect that MSG_COPY has priority and MSG_EXCEPT is ignored. The call should give an error if both flags are specified. The patch below implements that behavior. ===== (B) (B) MSG_COPY + !IPC_NOWAIT ===== The test code that was submitted in commit 3a665531a3b7 ("selftests: IPC message queue copy feature test") shows MSG_COPY being used in conjunction with IPC_NOWAIT. In other words, if there is no message at the position 'msgtyp'. return immediately with the error in ENOMSG. What was not (fully) tested is the behavior if MSG_COPY is specified *without* IPC_NOWAIT, and there is an odd behavior. If the queue contains less than 'msgtyp' messages, then the call blocks until the next message is written to the queue. At that point, the msgrcv() call returns a copy of the newly added message, regardless of whether that message is at the ordinal position 'msgtyp'. This is clearly bogus, and problematic for applications that might want to make use of the MSG_COPY flag. I considered the following possible solutions to this problem: (1) Force the call to block until a message *does* appear at the position 'msgtyp'. (2) If the MSG_COPY flag is specified, the kernel should implicitly add IPC_NOWAIT, so that the call fails with ENOMSG for this case. (3) If the MSG_COPY flag is specified, but IPC_NOWAIT is not, generate an error (probably, EINVAL is the right one). I do not know if any application would really want to have the functionality of solution (1), especially since an application can determine in advance the number of messages in the queue using msgctl() IPC_STAT. Obviously, this solution would be the most work to implement. Solution (2) would have the effect of silently fixing any applications that tried to employ broken behavior. However, it would mean that if we later decided to implement solution (1), then user-space could not easily detect what the kernel supports (but, since I'm somewhat doubtful that solution (1) is needed, I'm not sure that this is much of a problem). Solution (3) would have the effect of informing broken applications that they are doing something broken. The downside is that this would cause a ABI breakage for any applications that are currently employing the broken behavior. However: a) Those applications are almost certainly not getting the results they expect. b) Possibly, those applications don't even exist, because MSG_COPY is currently hidden behind CONFIG_CHECKPOINT_RESTORE. The upside of solution (3) is that if we later decided to implement solution (1), user-space could determine what the kernel supports, via the error return. In my view, solution (3) is mildly preferable to solution (2), and solution (1) could still be done later if anyone really cares. The patch below implements solution (3). PS. For anyone out there still listening, it's the usual story: documenting an API (and the thinking about, and the testing of the API, that documentation entails) is the one of the single best ways of finding bugs in the API, as I've learned from a lot of experience. Best to do that documentation before releasing the API. Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Cc: Stanislav Kinsbursky <skinsbursky@parallels.com> Cc: stable@vger.kernel.org Cc: Serge Hallyn <serge.hallyn@canonical.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>