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[SCSI] Make scsi_free_queue() kill pending SCSI commands
Make sure that SCSI device removal via scsi_remove_host() does finish all pending SCSI commands. Currently that's not the case and hence removal of a SCSI host during I/O can cause a deadlock. See also "blkdev_issue_discard() hangs forever if underlying storage device is removed" (http://bugzilla.kernel.org/show_bug.cgi?id=40472). See also http://lkml.org/lkml/2011/8/27/6. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Cc: <stable@kernel.org> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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