tree 98a55b2caf4315617fbb9187e5a15c7f53740ff8
parent 30cd324e9787ccc9a5ede59742d5409857550692
author Steven Rostedt <srostedt@redhat.com> 1230049944 -0500
committer Ingo Molnar <mingo@elte.hu> 1230054325 +0100

ring-buffer: fix dangling commit race

Impact: fix stuck trace-buffers

If an interrupt comes in during the rb_set_commit_to_write and
pushes the tail page forward just at the right time, the commit
updates will miss the adding of the interrupt data. This will
cause the commit pointer to cease from moving forward.

Thanks to Jiaying Zhang for finding this race.

Reported-by: Jiaying Zhang <jiayingz@google.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>