On Wed, Sep 15, 2010 at 05:57:10AM -0700, Brian Rogers wrote: > On 09/08/2010 07:16 AM, Jarod Wilson wrote: > >On Wed, Sep 08, 2010 at 07:04:03AM -0700, Brian Rogers wrote: > >>ir_dev->raw is also null. If I check these pointers before using > >>them, and bail out if both are null, then I get a working lircd, but > >>of course the file /sys/devices/virtual/rc/rc0/protocols no longer > >>does anything. On 2.6.35.4, the system never creates the > >>/sys/class/rc/rc0/current_protocol file. Is it the case that the > >>'protocols' file should never appear, because my card can't support > >>this feature? > >Hm... So protocols is indeed intended for hardware that handles raw IR, as > >its a list of raw IR decoders available/enabled/disabled for the receiver. > >But some devices that do onboard decoding and deal with scancodes still > >need to support changing protocols, as they can be told "decode rc5" or > >"decode nec", etc... My memory is currently foggy on how it was exactly > >that it was supposed to be donee though. :) (Yet another reason I really > >need to poke at the imon driver code again). > > How about the attached patch? Does this look like a reasonable > solution for 2.6.36? > > Brian > > From 7937051c5e2c8b5b0410172d48e62d54bd1906ee Mon Sep 17 00:00:00 2001 > From: Brian Rogers <brian@xxxxxxxx> > Date: Wed, 8 Sep 2010 05:33:34 -0700 > Subject: [PATCH] ir-core: Fix null dereferences in the protocols sysfs interface > > For some cards, ir_dev->props and ir_dev->raw are both NULL. These cards are > using built-in IR decoding instead of raw, and can't easily be made to switch > protocols. > > So upon reading /sys/class/rc/rc?/protocols on such a card, return 'builtin' as > the supported and enabled protocol. Return -EINVAL on any attempts to change > the protocol. And most important of all, don't crash. > > Signed-off-by: Brian Rogers <brian@xxxxxxxx> > --- > drivers/media/IR/ir-sysfs.c | 17 +++++++++++------ > 1 files changed, 11 insertions(+), 6 deletions(-) Yeah, this looks pretty sane for 2.6.36, would just be a short-lived panic preventer until David's interface changes get merged after 2.6.37-rc1. Acked-by: Jarod Wilson <jarod@xxxxxxxxxx> -- Jarod Wilson jarod@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
