Few of us have seen the AIC94XX driver get stuck reading the
ATOMICSTATCTL register in a loop for ever. The possible immortal loop
in asd_ddbsite_update_word() is made mortal now! Retry worked just
fine!
Signed-off-by: Malahal Naineni <malahal@xxxxxxxxxx>
diff -r 5f7a0e8a8265 drivers/scsi/aic94xx/aic94xx_reg.h
--- a/drivers/scsi/aic94xx/aic94xx_reg.h Wed Oct 25 13:28:35 2006 -0700
+++ b/drivers/scsi/aic94xx/aic94xx_reg.h Fri Oct 27 10:22:59 2006 -0700
@@ -226,20 +226,30 @@ static inline int asd_ddbsite_update_wor
u16 oldval, u16 newval)
{
u8 done;
+ int retries = 100;
+ int i;
+
u16 oval = asd_ddbsite_read_word(asd_ha, ddb_site_no, offs);
if (oval != oldval)
return -EAGAIN;
asd_write_reg_word(asd_ha, AOLDDATA, oldval);
asd_write_reg_word(asd_ha, ANEWDATA, newval);
- do {
+ for (i = 0; i < retries; i++) {
done = asd_read_reg_byte(asd_ha, ATOMICSTATCTL);
- } while (!(done & ATOMICDONE));
- if (done & ATOMICERR)
- return -EFAULT; /* parity error */
- else if (done & ATOMICWIN)
- return 0; /* success */
- else
- return -EAGAIN; /* oldval different than current value */
+ if (done & ATOMICDONE) {
+ if (done & ATOMICERR)
+ return -EFAULT; /* parity error */
+ else if (done & ATOMICWIN)
+ return 0; /* success */
+ else
+ /* oldval different than current value */
+ return -EAGAIN;
+ }
+ }
+
+ /* ATOMICDONE is not set after repeated retries! Broken chip? */
+ WARN_ON(1);
+ return -EAGAIN;
}
static inline int asd_ddbsite_update_byte(struct asd_ha_struct *asd_ha,
-
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