cciss: Ignore stale commands after reboot

When doing an unexpected shutdown like kexec the cciss
firmware might still have some commands in flight, which
it is trying to complete.
The driver is doing it's best on resetting the HBA,
but sadly there's a firmware issue causing the firmware
_not_ to abort or drop old commands.
So the firmware will send us commands which we haven't
accounted for, causing the driver to panic.

With this patch we're just ignoring these commands as
there is nothing we could be doing with them anyway.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Acked-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Jens Axboe <axboe@carl.(none)>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/block/cciss_cmd.h b/drivers/block/cciss_cmd.h
index cd665b00c7c5..dbaed1ea0da3 100644
--- a/drivers/block/cciss_cmd.h
+++ b/drivers/block/cciss_cmd.h
@@ -274,6 +274,7 @@ typedef struct _ErrorInfo_struct {
 #define CMD_SCSI        0x03
 #define CMD_MSG_DONE    0x04
 #define CMD_MSG_TIMEOUT 0x05
+#define CMD_MSG_STALE   0xff
 
 /* This structure needs to be divisible by 8 for new
  * indexing method.