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authorAndrew Vasquez <andrew.vasquez@qlogic.com>2007-10-19 15:59:18 -0700
committerJames Bottomley <jejb@mulgrave.localdomain>2007-10-23 15:54:41 -0400
commit6acf8190025e9c4ea513d4084ff089d476112816 (patch)
treed91f79a0afcb36abc91d1bbf2dc8c98d7f6ac869
parent285d0321d15cf3130b3347a207ceae652ccc95b5 (diff)
[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>
-rw-r--r--drivers/scsi/qla2xxx/qla_isr.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index c4768c4f399..1104bd2eed4 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1012,8 +1012,14 @@ qla2x00_status_entry(scsi_qla_host_t *ha, void *pkt)
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);