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[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>
This commit is contained in:
Andrew Vasquez 2007-10-19 15:59:18 -07:00 committed by James Bottomley
parent 285d0321d1
commit 6acf819002
1 changed files with 7 additions and 1 deletions
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8
drivers/scsi/qla2xxx/qla_isr.c
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@ -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);