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From: Tomas Henzl <thenzl@redhat.com>
To: linux-scsi@vger.kernel.org
Cc: steve.masters@lsi.com, michael.benz@lsi.com, aradford@gmail.com,
	bo.yang@lsi.com, Tomas Henzl <thenzl@redhat.com>
Subject: [PATCH 0/2] megaraid_sas: Fix an errant command from hw
Date: Wed, 24 Aug 2011 17:35:28 +0200	[thread overview]
Message-ID: <1314200130-28890-1-git-send-email-thenzl@redhat.com> (raw)

The following patch series provides a partial fix for a problem
seen in kdump after saving vmcore when the driver shuts down.

For unknown reason the card sends a command to the driver with a random values, 
we can then sometimes see this -
BUG: unable to handle kernel NULL pointer dereference at 00000090
....
The proper solution is to prevent this, maybe a firmware change is needed?

The first patch initializes the cmd field to a dummy value so the 'ghost' command
can be recognized.
The second patch removes the call to the megasas_shutdown_controller
in the megasas_shutdown_controller, because the errant cmd is sent while the controller
is shut down and it seems to be enough to only flush cache and disable interrupts.

Tomas

             reply	other threads:[~2011-08-24 15:35 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-24 15:35 Tomas Henzl [this message]
2011-08-24 15:35 ` [PATCH 1/2] megaraid_sas: Remove the shutdown_controller call Tomas Henzl
2011-08-24 20:55   ` adam radford
2011-08-25  8:17     ` Tomas Henzl
2011-08-26  0:00       ` adam radford
2011-09-05 14:17         ` Tomas Henzl
2011-08-24 15:35 ` [PATCH 2/2] megaraid_sas: Initialize the cmd field to a known value Tomas Henzl

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