kernel/linux.git/drivers/firewire/ohci.c, branch v5.4.151

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman

drivers: Remove explicit invocations of mmiowb()

2019-04-08T11:01:02+00:00

mmiowb() is now implied by spin_unlock() on architectures that require it, so there is no reason to call it from driver code. This patch was generated using coccinelle: @mmiowb@ @@ - mmiowb(); and invoked as: $ for d in drivers include/linux/qed sound; do \ spatch --include-headers --sp-file mmiowb.cocci --dir $d --in-place; done NOTE: mmiowb() has only ever guaranteed ordering in conjunction with spin_unlock(). However, pairing each mmiowb() removal in this patch with the corresponding call to spin_unlock() is not at all trivial, so there is a small chance that this change may regress any drivers incorrectly relying on mmiowb() to order MMIO writes between CPUs using lock-free synchronisation. If you've ended up bisecting to this commit, you can reintroduce the mmiowb() calls using wmb() instead, which should restore the old behaviour on all architectures other than some esoteric ia64 systems. Acked-by: Linus Torvalds Signed-off-by: Will Deacon

Merge tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394

2018-02-02T22:57:44+00:00

Pull firewire updates from Stefan Richter - make JMicron JMB38x controllers work with IOMMU-equipped systems - IP-over-1394: allow user-configured MTU of up to 4096 bytes * tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: firewire-ohci: work around oversized DMA reads on JMicron controllers firewire: net: max MTU off by one

firewire-ohci: work around oversized DMA reads on JMicron controllers

2018-01-13T16:19:12+00:00

At least some JMicron controllers issue buggy oversized DMA reads when fetching context descriptors, always fetching 0x20 bytes at once for descriptors which are only 0x10 bytes long. This is often harmless, but can cause page faults on modern systems with IOMMUs: DMAR: [DMA Read] Request device [05:00.0] fault addr fff56000 [fault reason 06] PTE Read access is not set firewire_ohci 0000:05:00.0: DMA context IT0 has stopped, error code: evt_descriptor_read This works around the problem by always leaving 0x10 padding bytes at the end of descriptor buffer pages, which should be harmless to do unconditionally for controllers in case others have the same behavior. Signed-off-by: Hector Martin Reviewed-by: Clemens Ladisch Signed-off-by: Stefan Richter

locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns to READ_ONCE()/WRITE_ONCE()

2017-10-25T09:01:08+00:00

Please do not apply this to mainline directly, instead please re-run the coccinelle script shown below and apply its output. For several reasons, it is desirable to use {READ,WRITE}_ONCE() in preference to ACCESS_ONCE(), and new code is expected to use one of the former. So far, there's been no reason to change most existing uses of ACCESS_ONCE(), as these aren't harmful, and changing them results in churn. However, for some features, the read/write distinction is critical to correct operation. To distinguish these cases, separate read/write accessors must be used. This patch migrates (most) remaining ACCESS_ONCE() instances to {READ,WRITE}_ONCE(), using the following coccinelle script: ---- // Convert trivial ACCESS_ONCE() uses to equivalent READ_ONCE() and // WRITE_ONCE() // $ make coccicheck COCCI=/home/mark/once.cocci SPFLAGS="--include-headers" MODE=patch virtual patch @ depends on patch @ expression E1, E2; @@ - ACCESS_ONCE(E1) = E2 + WRITE_ONCE(E1, E2) @ depends on patch @ expression E; @@ - ACCESS_ONCE(E) + READ_ONCE(E) ---- Signed-off-by: Mark Rutland Signed-off-by: Paul E. McKenney Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: davem@davemloft.net Cc: linux-arch@vger.kernel.org Cc: mpe@ellerman.id.au Cc: shuah@kernel.org Cc: snitzer@redhat.com Cc: thor.thayer@linux.intel.com Cc: tj@kernel.org Cc: viro@zeniv.linux.org.uk Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/1508792849-3115-19-git-send-email-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar

firewire: ohci: propagate return code from soft_reset to probe and resume

2015-11-05T13:25:31+00:00

software_reset() may fail - due to unresponsive chip with -EBUSY (-16), or - due to ejected or unseated card with -ENODEV (-19). Let the PCI probe and resume routines log the actual error code instead of hardwired -EBUSY. Signed-off-by: Stefan Richter

firewire: ohci: fix JMicron JMB38x IT context discovery

2015-11-05T13:17:30+00:00

Reported by Clifford and Craig for JMicron OHCI-1394 + SDHCI combo controllers: Often or even most of the time, the controller is initialized with the message "added OHCI v1.10 device as card 0, 4 IR + 0 IT contexts, quirks 0x10". With 0 isochronous transmit DMA contexts (IT contexts), applications like audio output are impossible. However, OHCI-1394 demands that at least 4 IT contexts are implemented by the link layer controller, and indeed JMicron JMB38x do implement four of them. Only their IsoXmitIntMask register is unreliable at early access. With my own JMB381 single function controller I found: - I can reproduce the problem with a lower probability than Craig's. - If I put a loop around the section which clears and reads IsoXmitIntMask, then either the first or the second attempt will return the correct initial mask of 0x0000000f. I never encountered a case of needing more than a second attempt. - Consequently, if I put a dummy reg_read(...IsoXmitIntMaskSet) before the first write, the subsequent read will return the correct result. - If I merely ignore a wrong read result and force the known real result, later isochronous transmit DMA usage works just fine. So let's just fix this chip bug up by the latter method. Tested with JMB381 on kernel 3.13 and 4.3. Since OHCI-1394 generally requires 4 IT contexts at a minium, this workaround is simply applied whenever the initial read of IsoXmitIntMask returns 0, regardless whether it's a JMicron chip or not. I never heard of this issue together with any other chip though. I am not 100% sure that this fix works on the OHCI-1394 part of JMB380 and JMB388 combo controllers exactly the same as on the JMB381 single- function controller, but so far I haven't had a chance to let an owner of a combo chip run a patched kernel. Strangely enough, IsoRecvIntMask is always reported correctly, even though it is probed right before IsoXmitIntMask. Reported-by: Clifford Dunn Reported-by: Craig Moore Cc: stable@vger.kernel.org Signed-off-by: Stefan Richter

firewire: ohci: Remove unused function

2015-01-22T10:08:52+00:00

Remove the function ar_prev_buffer_index() that is not used anywhere. This was partially found by using a static code analysis program called cppcheck. Signed-off-by: Rickard Strandqvist Signed-off-by: Stefan Richter

firewire: ohci: replace vm_map_ram() with vmap()

2014-11-19T10:57:50+00:00

vm_map_ram() is intended for short-lived objects, so using it for the AR buffers could fragment address space, especially on a 32-bit machine. For an allocation that lives as long as the device, vmap() is the better choice. Signed-off-by: Clemens Ladisch Signed-off-by: Stefan Richter

Merge tag 'firewire-fix-vt6315' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394

2014-07-27T16:42:06+00:00

Pull firewire regression fix from Stefan Richter: "IEEE 1394 (FireWire) subsystem fix: MSI don't work on VIA PCIe controllers with some isochronous workloads (regression since v3.16-rc1)" * tag 'firewire-fix-vt6315' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: firewire: ohci: disable MSI for VIA VT6315 again