Commit-ID: 64ddedc03c9ecbe97b0700e85c5f11d2f5a4565c Gitweb: http://git.kernel.org/tip/64ddedc03c9ecbe97b0700e85c5f11d2f5a4565c Author: Li Zefan <lizf@xxxxxxxxxxxxxx> AuthorDate: Fri, 20 Mar 2009 09:48:47 +0800 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Fri, 20 Mar 2009 11:20:05 +0100 blktrace: don't increase blk_probes_ref if failed to setup blk trace do_blk_trace_setup() may return EBUSY, but the current code doesn't decrease blk_probes_ref in this case. Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx> Cc: Jens Axboe <jens.axboe@xxxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Acked-by: Frederic Weisbecker <fweisbec@xxxxxxxxx> LKML-Reference: <49C2F5FF.80002@xxxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- kernel/trace/blktrace.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 223b92e..11e7c8d 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -468,9 +468,6 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, bt->pid = buts->pid; bt->trace_state = Blktrace_setup; - if (atomic_add_return(1, &blk_probes_ref) == 1) - blk_register_tracepoints(); - ret = -EBUSY; old_bt = xchg(&q->blk_trace, bt); if (old_bt) { @@ -478,6 +475,9 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, goto err; } + if (atomic_add_return(1, &blk_probes_ref) == 1) + blk_register_tracepoints(); + return 0; err: if (bt) { -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html