[SCSI] megaraid_{mm,mbox}: fix a bug in reset handler

When abort failed, the driver gets reset handleer called.  In the reset
handler, driver calls 'scsi_done()' callback for same SCSI command packet
(struct scsi_cmnd) multiple times if there are multiple SCSI command packet
in the pend_list.  More over, if there are entry in the pend_lsit with
IOCTL packet associated, the driver returns it to wrong free_list so that,
in turn, the driver could end up with 'NULL pointer dereference..' during
I/O command building with incorrect resource.

Also, the patch contains several minor/cosmetic changes besides this.

Signed-off-by: Seokmann Ju <seokmann.ju@lsil.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/Documentation/scsi/ChangeLog.megaraid b/Documentation/scsi/ChangeLog.megaraid
index 09f6300eda4b..c173806c91fa 100644
--- a/Documentation/scsi/ChangeLog.megaraid
+++ b/Documentation/scsi/ChangeLog.megaraid
@@ -1,3 +1,28 @@
+Release Date    : Mon Apr 11 12:27:22 EST 2006 - Seokmann Ju <sju@lsil.com>
+Current Version : 2.20.4.8 (scsi module), 2.20.2.6 (cmm module)
+Older Version   : 2.20.4.7 (scsi module), 2.20.2.6 (cmm module)
+
+1.      Fixed a bug in megaraid_reset_handler().
+        Customer reported "Unable to handle kernel NULL pointer dereference
+        at virtual address 00000000" when system goes to reset condition
+        for some reason. It happened randomly.
+        Root Cause: in the megaraid_reset_handler(), there is possibility not
+        returning pending packets in the pend_list if there are multiple
+        pending packets.
+        Fix: Made the change in the driver so that it will return all packets
+        in the pend_list.
+
+2.      Added change request.
+        As found in the following URL, rmb() only didn't help the
+        problem. I had to increase the loop counter to 0xFFFFFF. (6 F's)
+        http://marc.theaimsgroup.com/?l=linux-scsi&m=110971060502497&w=2
+
+        I attached a patch for your reference, too.
+        Could you check and get this fix in your driver?
+
+        Best Regards,
+        Jun'ichi Nomura
+
 Release Date    : Fri Nov 11 12:27:22 EST 2005 - Seokmann Ju <sju@lsil.com>
 Current Version : 2.20.4.7 (scsi module), 2.20.2.6 (cmm module)
 Older Version   : 2.20.4.6 (scsi module), 2.20.2.6 (cmm module)