kernel/linux.git/drivers/pps/clients, branch v3.2.95

pps: do not crash when failed to register

2016-11-20T01:01:28+00:00

commit 368301f2fe4b07e5fb71dba3cc566bc59eb6705f upstream. With this command sequence: modprobe plip modprobe pps_parport rmmod pps_parport the partport_pps modules causes this crash: BUG: unable to handle kernel NULL pointer dereference at (null) IP: parport_detach+0x1d/0x60 [pps_parport] Oops: 0000 [#1] SMP ... Call Trace: parport_unregister_driver+0x65/0xc0 [parport] SyS_delete_module+0x187/0x210 The sequence that builds up to this is: 1) plip is loaded and takes the parport device for exclusive use: plip0: Parallel port at 0x378, using IRQ 7. 2) pps_parport then fails to grab the device: pps_parport: parallel port PPS client parport0: cannot grant exclusive access for device pps_parport pps_parport: couldn't register with parport0 3) rmmod of pps_parport is then killed because it tries to access pardev->name, but pardev (taken from port->cad) is NULL. So add a check for NULL in the test there too. Link: http://lkml.kernel.org/r/20160714115245.12651-1-jslaby@suse.cz Signed-off-by: Jiri Slaby Acked-by: Rodolfo Giometti Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Ben Hutchings

pps: Use pps_lookup_dev to reduce ldisc coupling

2013-03-06T03:23:58+00:00

commit 03a7ffe4e542310838bac70ef85acc17536b6d7c upstream. Now that N_TTY uses tty->disc_data for its private data, 'subclass' ldiscs cannot use ->disc_data for their own private data. (This is a regression is v3.8-rc1) Use pps_lookup_dev to associate the tty with the pps source instead. This fixes a crashing regression in 3.8-rc1. Signed-off-by: George Spelvin Acked-by: Rodolfo Giometti Signed-off-by: Greg Kroah-Hartman Signed-off-by: Ben Hutchings

pps gpio client: add missing dependency

2011-11-02T23:07:02+00:00

Add "depends on GENERIC_HARDIRQS" to avoid compile breakage on s390: drivers/built-in.o: In function `pps_gpio_remove': linux-next/drivers/pps/clients/pps-gpio.c:189: undefined reference to `free_irq' Signed-off-by: Heiko Carstens Cc: James Nuss Cc: Rodolfo Giometti Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

pps: new client driver using GPIO

2011-11-02T23:07:02+00:00

This client driver allows you to use a GPIO pin as a source for PPS signals. Platform data [1] are used to specify the GPIO pin number, label, assert event edge type, and whether clear events are captured. This driver is based on the work by Ricardo Martins who submitted an initial implementation [2] of a PPS IRQ client driver to the linuxpps mailing-list on Dec 3 2010. [1] include/linux/pps-gpio.h [2] http://ml.enneenne.com/pipermail/linuxpps/2010-December/004155.html [akpm@linux-foundation.org: remove unneeded cast of void*] Signed-off-by: James Nuss Cc: Ricardo Martins Acked-by: Rodolfo Giometti Signed-off-by: Ricardo Martins Cc: Alexander Gordeev Cc: Igor Plyatov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

pps: default echo function

2011-11-02T23:07:02+00:00

A default echo function has been provided so it is no longer an error when you specify PPS_ECHOASSERT or PPS_ECHOCLEAR without an explicit echo function. This allows some code re-use and also makes it easier to write client drivers since the default echo function does not normally need to change. Signed-off-by: James Nuss Reviewed-by: Ben Gardiner Acked-by: Rodolfo Giometti Cc: Ricardo Martins Cc: Alexander Gordeev Cc: Igor Plyatov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

pps: change to new flag variable

2011-03-17T13:05:35+00:00

Replace EXTRA_CFLAGS with ccflags-y. Signed-off-by: matt mooney Acked-by: WANG Cong Signed-off-by: Michal Marek

pps: claim parallel port exclusively

2011-01-26T00:50:00+00:00

Both pps_parport and pps_gen_parport are written in a way that they can't share a port with any other driver. This can result in locking up the process that loads modules or even the whole kernel if the modules are compiled in. Use PARPORT_FLAG_EXCL to indicate this. Signed-off-by: Alexander Gordeev Cc: Alexander Gordeev Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

pps ktimer: remove noisy message

2011-01-26T00:49:59+00:00

Signed-off-by: Rodolfo Giometti Reported-by: Ingo Molnar Cc: Alexander Gordeev Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

pps: add parallel port PPS client

2011-01-13T16:03:21+00:00

Add parallel port PPS client. It uses a standard method for capturing timestamps for assert edge transitions: getting a timestamp soon after an interrupt has happened. This is not a very precise source of time information due to interrupt handling delays. However, timestamps for clear edge transitions are much more precise because the interrupt handler continuously polls hardware port until the transition is done. Hardware port operations require only about 1us so the maximum error should not exceed this value. This was my primary goal when developing this client. Clear edge capture could be disabled using clear_wait parameter. Signed-off-by: Alexander Gordeev Acked-by: Rodolfo Giometti Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

pps: timestamp is always passed to dcd_change()

2011-01-13T16:03:20+00:00

Remove the code that gatheres timestamp in pps_tty_dcd_change() in case passed ts parameter is NULL because it never happens in the current code. Fix comments as well. Signed-off-by: Alexander Gordeev Acked-by: Rodolfo Giometti Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds