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| author | Yogesh Gaur <yn.gaur@samsung.com> | 2016-07-27 09:33:04 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2016-07-28 00:56:34 +1000 |
| commit | 4d6334ef8948b69d7e29013bf46b8518ac902127 (patch) | |
| tree | e418c26b0e390af62168955d1846b0dbcb850866 /drivers/firmware/broadcom/bcm47xx_sprom.c | |
| parent | 58e950e5249eed9c6b7048b93cbd196b484d2559 (diff) | |
| download | linux-next-4d6334ef8948b69d7e29013bf46b8518ac902127.tar.gz | |
ipc/msg.c: use freezable blocking call
Avoid waking up every thread sleeping in a msgrcv call during suspend and
resume by calling a freezable blocking call. Previous patches modified
the freezer to avoid sending wakeups to threads that are blocked in
freezable blocking calls.
Ref: https://lkml.org/lkml/2013/5/1/424
Backtrace:
[<c03e3924>] (__schedule+0x0/0x5d8) from [<c03e3f88>] (schedule+0x8c/0x90)
[<c03e3efc>] (schedule+0x0/0x90) from [<c01ef9f8>] (do_msgrcv+0x2e0/0x368)
[<c01ef718>] (do_msgrcv+0x0/0x368) from [<c01efaac>] (SyS_msgrcv+0x2c/0x38)
[<c01efa80>] (SyS_msgrcv+0x0/0x38) from [<c001a180>] (ret_fast_syscall+0x0/0x48)
tPlay0Cb2 R running 0 297 204 0x00000001
This call was selected to be converted to a freezable call because it
doesn't hold any locks or release any resources when interrupted that
might be needed by another freezing task or a kernel driver during
suspend, and is a common site where idle userspace tasks are blocked.
Signed-off-by: Yogesh Gaur <yn.gaur@samsung.com>
Signed-off-by: Manjeet Pawar <manjeet.p@samsung.com>
Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Reviewed-by : Ajeet Yadav <ajeet.y@samsung.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/firmware/broadcom/bcm47xx_sprom.c')
0 files changed, 0 insertions, 0 deletions