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[SCSI] libfc: fix rport event race between READY and LOGO
When a remote port becomes ready and a LOGO is received before the READY event is in rport_work waiting on the mutex, the event is changed to LOGO and the work queued, so both the calls to rport_work see the LOGO event, and both try to do the list_del(), causing a crash. Don't change the event if it is already set. Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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