Em 28-07-2010 14:43, Jarod Wilson escreveu: > On Wed, Jul 28, 2010 at 07:32:58PM +0300, Maxim Levitsky wrote: >> On Wed, 2010-07-28 at 13:03 -0300, Mauro Carvalho Chehab wrote: >>> Em 28-07-2010 12:14, Maxim Levitsky escreveu: >>>> Some handlers (lirc for example) allocates memory on initialization, >>>> doing so in atomic context is cumbersome. >>>> Fixes warning about sleeping function in atomic context. >>> >>> You should not replace it by a mutex, as the decoding code may happen during >>> IRQ time on several drivers. >> I though decoding code is run by a work queue? > > Yeah, it is. (INIT_WORK(&ir->raw->rx_work, ir_raw_event_work); in > ir_raw_event_register). > >> I don't see any atomic codepath here... > > I think the ir_raw_event_store variants are the only things that are run > from an interrupt context, and none of them touch ir_raw_handler_lock. > That lock is advertised as being for the protection of ir_raw_handler_list > and ir_raw_client_list, which are primarily manipulated by > register/unregister functions, and we just lock them when doing actual IR > decode work (via said work queue) so we don't feed raw IR somewhere that > we shouldn't. I think Maxim is correct here, we should be okay with > changing this to a mutex, unless I'm missing something else. You're probably right. The previous code used to do this at IRQ time, but a latter patch changed it to happen via a workqueue. So, I'm OK with this patch. Cheers, Mauro. -- 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
