[SCSI] qla2xxx: Correct residual-count handling discrepancies during UNDERRUN handling.
For recent ISPs, software during CS_UNDERRUN handling must
determine if the two residuals, firmware-calculated and FCP_RSP,
are different to recognize if a frame has been dropped. Update
the driver to catch this condition, and clear the
SS_RESIDUAL_UNDER and lscsi_status bits. This logic is
consistent with what earlier firmwares did by explicitly
cracking open the FCP_RSP statuses and clearing
SS_RESIDUAL_UNDER.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index c4768c4..1104bd2 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1012,8 +1012,14 @@
case CS_DATA_UNDERRUN:
resid = resid_len;
/* Use F/W calculated residual length. */
- if (IS_FWI2_CAPABLE(ha))
+ if (IS_FWI2_CAPABLE(ha)) {
+ if (scsi_status & SS_RESIDUAL_UNDER &&
+ resid != fw_resid_len) {
+ scsi_status &= ~SS_RESIDUAL_UNDER;
+ lscsi_status = 0;
+ }
resid = fw_resid_len;
+ }
if (scsi_status & SS_RESIDUAL_UNDER) {
scsi_set_resid(cp, resid);