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swh:1:snp:38ae39f9fd01a4b0ef06fab5668b65bf4c2aca03
Revision df62db5be2e5f070ecd1a5ece5945b590ee112e0 authored by Steven Rostedt (VMware) on 19 April 2017, 16:07:08 UTC, committed by Steven Rostedt (VMware) on 19 April 2017, 18:19:08 UTC 
tracing: Allocate the snapshot buffer before enabling probe
 
Currently the snapshot trigger enables the probe and then allocates the
snapshot. If the probe triggers before the allocation, it could cause the
snapshot to fail and turn tracing off. It's best to allocate the snapshot
buffer first, and then enable the trigger. If something goes wrong in the
enabling of the trigger, the snapshot buffer is still allocated, but it can
also be freed by the user by writting zero into the snapshot buffer file.

Also add a check of the return status of alloc_snapshot().

Cc: stable@vger.kernel.org
Fixes: 77fd5c15e3 ("tracing: Add snapshot trigger to function probes")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 parent 9ed19c7
History
Tip revision: 0cdd776ec92c0fec768c7079331804d3e52d4b27 authored by Linus Torvalds on 15 May 2022, 15:08:51 UTC
Merge tag 'driver-core-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Tip revision: 0cdd776
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