tree 6070ae50cded8086ceab61092348790b39876146
parent 15424921222f2bed0aa92ef1e8bc94f753d2c6ea
author Swen Schillig <swen@vnet.ibm.com> 1211192257 +0200
committer James Bottomley <James.Bottomley@HansenPartnership.com> 1212676033 -0500

[SCSI] zfcp: receiving an unsolicted status can lead to I/O stall

Processing of an unsolicted status request can lead to a locking race
of the request_queue's queue_lock during the recreation of the
used up status read request while still in interrupt context
of the response handler.

Detaching the 'refill' of the long running status read requests from
the handler to a scheduled work is solving this issue.

In addition, each refill-run is trying to re-establish the full amount
of status read requests, which might have failed in earlier runs.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>