diff options
| author | Anton Blanchard <anton@samba.org> | 2012-09-03 16:47:56 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-05 16:05:20 +1000 |
| commit | 1b6ca2a6fe56e7697d57348646e07df08f43b1bb (patch) | |
| tree | e6002bbd58816dfe10b639e2843c804b5dad18c3 /include/sound/mixer_oss.h | |
| parent | 375f561a4131a0f501c8845a2a20f2ca1abc8f7a (diff) | |
powerpc: Update DSCR on all CPUs when writing sysfs dscr_default
Writing to dscr_default in sysfs doesn't actually change the DSCR -
we rely on a context switch on each CPU to do the work. There is no
guarantee we will get a context switch in a reasonable amount of time
so fire off an IPI to force an immediate change.
This issue was found with the following test case:
http://ozlabs.org/~anton/junkcode/dscr_explicit_test.c
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: <stable@kernel.org> # 3.0+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include/sound/mixer_oss.h')
0 files changed, 0 insertions, 0 deletions