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authorMing Lei <ming.lei@redhat.com>2019-01-15 06:59:52 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-15 07:29:57 +0300
commitfe76fc6aaf538df27708ffa3e5d549a6c8e16142 (patch)
tree4fda8ebbcb82694899a476026684951e25d9b853 /Documentation
parent3719876809e745b9db5293d418600c194bbf5c23 (diff)
downloadlinux-fe76fc6aaf538df27708ffa3e5d549a6c8e16142.tar.xz
sbitmap: Protect swap_lock from hardirq
Because we may call blk_mq_get_driver_tag() directly from blk_mq_dispatch_rq_list() without holding any lock, then HARDIRQ may come and the above DEADLOCK is triggered. Commit ab53dcfb3e7b ("sbitmap: Protect swap_lock from hardirq") tries to fix this issue by using 'spin_lock_bh', which isn't enough because we complete request from hardirq context direclty in case of multiqueue. Cc: Clark Williams <williams@redhat.com> Fixes: ab53dcfb3e7b ("sbitmap: Protect swap_lock from hardirq") Cc: Jens Axboe <axboe@kernel.dk> Cc: Ming Lei <ming.lei@redhat.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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