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During port disable operations "SG_IO" ioctl sent on device gets stuck in kernel and never returns causing system hang.

Solution Verified - Updated 2016-04-06T03:58:16+00:00 -

Issue

SG_IO ioctl gets stuck in kernel. Steps to Reproduce:
Have a thread running SG_IO ioctl to devices
disable/enable ports in loop
sometimes it causes SG_IO to get stuck
When the qla2xxx driver loses access to multiple, remote ports, there is a race condition which can occur which will keep the request stuck on a scsi request queue indefinitely.

Environment

Red Hat Enterprise Linux 6
kernel-2.6.32-220.el6.x86_64
qla2xxx driver

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