blk-mq-debug: Make show() operations interruptible
Allow users to interrupt show operations instead of making a user space process unkillable if ownership of q->sysfs_lock cannot be obtained. Signed-off-by: NBart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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