Commit 6acf8190 authored Oct 19, 2007 by Andrew Vasquez Committed by James Bottomley Oct 23, 2007

[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>

parent 285d0321

drivers/scsi/qla2xxx/qla_isr.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -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);