[SCSI] aic94xx: fix TMF ascb handling to prevent sequencer panic

This is a particularly nasty bug.  The problem is that if any internal
ascb times out, currently we free it even though it's pending at the
sequencer.  This results in the sequencer getting terminally confused
and the error message:

BUG:sequencer:dl:no ascb

Being returned when it comes back.  The way to fix this is to manage
freeing the ascb from the tasklet completion routine, so that we only
free it when the sequencer actually returns it.  The code is also
altered to use on stack completions and transfer variables.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_hwi.h b/drivers/scsi/aic94xx/aic94xx_hwi.h
index 150f6706d23f..abc757559c1a 100644
--- a/drivers/scsi/aic94xx/aic94xx_hwi.h
+++ b/drivers/scsi/aic94xx/aic94xx_hwi.h
@@ -140,7 +140,7 @@ struct asd_ascb {
 
         /* internally generated command */
         struct timer_list timer;
-        struct completion completion;
+        struct completion *completion;
         u8        tag_valid:1;
         __be16    tag;            /* error recovery only */
 
@@ -294,7 +294,6 @@ static inline void asd_init_ascb(struct asd_ha_struct *asd_ha,
         ascb->timer.function = NULL;
         init_timer(&ascb->timer);
         ascb->tc_index = -1;
-        init_completion(&ascb->completion);
 }
 
 /* Must be called with the tc_index_lock held!