sbp2_command_orb_lock must be held when accessing the _orb_inuse list.

Fixes an oops in sbp2util_find_command_for_SCpnt after sbp2scsi_abort:
https://bugzilla.novell.com/show_bug.cgi?id=113734

Signed-off-by: Jody McIntyre <scjody@steamballoon.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
(cherry picked from 7945619794314414a5c44df11fca4d3f2a3389cf commit)

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index 12cec7c4a34..f7e18ccc5c0 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -2350,6 +2350,7 @@ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, int dest
         struct scsi_cmnd *SCpnt = NULL;
         u32 scsi_status = SBP2_SCSI_STATUS_GOOD;
         struct sbp2_command_info *command;
+        unsigned long flags;
 
         SBP2_DEBUG("sbp2_handle_status_write");
 
@@ -2451,9 +2452,11 @@ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, int dest
                  * null out last orb so that next time around we write directly to the orb pointer...
                  * Quick start saves one 1394 bus transaction.
                  */
+                spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
                 if (list_empty(&scsi_id->sbp2_command_orb_inuse)) {
                         scsi_id->last_orb = NULL;
                 }
+                spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
 
         } else {
 
@@ -2563,9 +2566,11 @@ static void sbp2scsi_complete_all_commands(struct scsi_id_instance_data *scsi_id
         struct sbp2scsi_host_info *hi = scsi_id->hi;
         struct list_head *lh;
         struct sbp2_command_info *command;
+        unsigned long flags;
 
         SBP2_DEBUG("sbp2scsi_complete_all_commands");
 
+        spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags);
         while (!list_empty(&scsi_id->sbp2_command_orb_inuse)) {
                 SBP2_DEBUG("Found pending command to complete");
                 lh = scsi_id->sbp2_command_orb_inuse.next;
@@ -2582,6 +2587,7 @@ static void sbp2scsi_complete_all_commands(struct scsi_id_instance_data *scsi_id
                         command->Current_done(command->Current_SCpnt);
                 }
         }
+        spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);
 
         return;
 }