tree 455b30ad8a4efffe84e472e9036fcd319eab0f82
parent bd024e82e4cd95c7f1a475a55f99871936c2b2db
author Qi Liu <liuqi115@huawei.com> 1594975763 +0800
committer Will Deacon <will@kernel.org> 1594979504 +0100

drivers/perf: Prevent forced unbinding of PMU drivers

Forcefully unbinding PMU drivers during perf sampling will lead to
a kernel panic, because the perf upper-layer framework call a NULL
pointer in this situation.

To solve this issue, "suppress_bind_attrs" should be set to true, so
that bind/unbind can be disabled via sysfs and prevent unbinding PMU
drivers during perf sampling.

Signed-off-by: Qi Liu <liuqi115@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1594975763-32966-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>