[SCSI] aic94xx: Lock DDB read/write accesses

Extend the use of the DDB lock to include all DDB accesses, because
DDB updates now occur from multiple threads.  This fixes the SMP timeout
problems that we were occasionally seeing with a x260, because the
controller got confused when the DDBs got corrupted.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_seq.c b/drivers/scsi/aic94xx/aic94xx_seq.c
index 0d343cfd4333..2768fe4d66ba 100644
--- a/drivers/scsi/aic94xx/aic94xx_seq.c
+++ b/drivers/scsi/aic94xx/aic94xx_seq.c
@@ -1395,7 +1395,9 @@ void asd_update_port_links(struct asd_ha_struct *asd_ha, struct asd_phy *phy)
         u8  phy_is_up;
         u8  mask;
         int i, err;
+        unsigned long flags;
 
+        spin_lock_irqsave(&asd_ha->hw_prof.ddb_lock, flags);
         for_each_phy(phy_mask, mask, i)
                 asd_ddbsite_write_byte(asd_ha, 0,
                                        offsetof(struct asd_ddb_seq_shared,
@@ -1415,6 +1417,7 @@ void asd_update_port_links(struct asd_ha_struct *asd_ha, struct asd_phy *phy)
                         break;
                 }
         }
+        spin_unlock_irqrestore(&asd_ha->hw_prof.ddb_lock, flags);
 
         if (err)
                 asd_printk("couldn't update DDB 0:error:%d\n", err);