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Locking functions previously using read_lock_irq()/read_lock_irqsave() were
changed to local_irq_disable/save(), leading to gripes.  Use nort variants.

|BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:915
|in_atomic(): 0, irqs_disabled(): 1, pid: 5947, name: alsa-sink-ALC88
|CPU: 5 PID: 5947 Comm: alsa-sink-ALC88 Not tainted 3.18.7-rt1 #9
|Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.404 11/06/2014
| ffff880409316240 ffff88040866fa38 ffffffff815bdeb5 0000000000000002
| 0000000000000000 ffff88040866fa58 ffffffff81073c86 ffffffffa03b2640
| ffff88040239ec00 ffff88040866fa78 ffffffff815c3d34 ffffffffa03b2640
|Call Trace:
| [<ffffffff815bdeb5>] dump_stack+0x4f/0x9e
| [<ffffffff81073c86>] __might_sleep+0xe6/0x150
| [<ffffffff815c3d34>] __rt_spin_lock+0x24/0x50
| [<ffffffff815c4044>] rt_read_lock+0x34/0x40
| [<ffffffffa03a2979>] snd_pcm_stream_lock+0x29/0x70 [snd_pcm]
| [<ffffffffa03a355d>] snd_pcm_playback_poll+0x5d/0x120 [snd_pcm]
| [<ffffffff811937a2>] do_sys_poll+0x322/0x5b0
| [<ffffffff81193d48>] SyS_ppoll+0x1a8/0x1c0
| [<ffffffff815c4556>] system_call_fastpath+0x16/0x1b

Signed-off-by: Mike Galbraith <umgwanakikbuti>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy>

Created attachment 1262542 [details]
snd/pcm: fix snd_pcm_stream_lock*() irqs_disabled() splats

Fixed with d2128c5514137dc62ed32f1403d22f7f11bafa83

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:2077

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:2077