tree d620f4cc0fe75ca43b48a675fb7bd681cb7919f3
parent 57069386699994c3e67042fc4928c418f3a39e01
author Swen Schillig <swen@vnet.ibm.com> 1222857742 +0200
committer James Bottomley <James.Bottomley@HansenPartnership.com> 1223053915 -0500

[SCSI] zfcp: fix deadlock caused by shared work queue tasks

Each adapter reopen trigger automatically a scan_port task which
is waiting for the ERP to be finished before further processing.
Since the initial device setup enqueues adapter, port and LUN which
are individual ERP actions, this process would start after
everything is done. Unfortunately the port_reopen requires another
scheduled work to be finished which is queued after the automatic
scan_port -> deadlock !

This fix creates an own work queue for ERP based nameserver requests.

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>