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| author | Jeff Moyer <jmoyer@redhat.com> | 2014-09-02 13:17:00 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-11-05 20:27:40 +0000 |
| commit | 1cc8e21690688b24b0b9388dbb14e1d2cf4f94b4 (patch) | |
| tree | 66c1fbf3c45571f78bb1b4c907f134affada8f0c /block/genhd.c | |
| parent | 11d3b506cc0db26d2f2078bd4df88803cd06c819 (diff) | |
| download | kernel_samsung_smdk4412-1cc8e21690688b24b0b9388dbb14e1d2cf4f94b4.zip kernel_samsung_smdk4412-1cc8e21690688b24b0b9388dbb14e1d2cf4f94b4.tar.gz kernel_samsung_smdk4412-1cc8e21690688b24b0b9388dbb14e1d2cf4f94b4.tar.bz2 | |
aio: add missing smp_rmb() in read_events_ring
commit 2ff396be602f10b5eab8e73b24f20348fa2de159 upstream.
We ran into a case on ppc64 running mariadb where io_getevents would
return zeroed out I/O events. After adding instrumentation, it became
clear that there was some missing synchronization between reading the
tail pointer and the events themselves. This small patch fixes the
problem in testing.
Thanks to Zach for helping to look into this, and suggesting the fix.
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
[bwh: Backported to 3.2: adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'block/genhd.c')
0 files changed, 0 insertions, 0 deletions