[PATCH] cciss: force ignore of responses to unsent scsi commands after kexec reboot

From: Neil Horman
Date: Thu Jun 14 2007 - 11:32:33 EST

Hey -
cciss hardware currently can continue to send responses to scsi commands
after the host system has undergone a kexec reboot. The way the drier is
currently written, reception of these commands results in a BUG halt, since it
can't match the response to any issued command since the boot. This patch
corrects that by using the kexec reset_devices command line paramter to force
ignore any commands that it cant correlate.


Signed-off-by: Neil Horman <nhorman@xxxxxxxxxxxxx>

cciss.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 5acc6c4..ec1c1d2 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -2131,6 +2131,14 @@ static int add_sendcmd_reject(__u8 cmd, int ctlr, unsigned long complete)
ctlr, complete);
/* not much we can do. */
+ /* We might get notification of completion of commands
+ * which we never issued in this kernel if this boot is
+ * taking place after previous kernel's crash. Simply
+ * ignore the commands in this case.
+ */
+ if (reset_devices)
+ return 0;
return 1;

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