diff mbox series

[v2,7/7] scsi: mac_scsi: Treat Last Byte Sent time-out as failure

Message ID 825f9cc5f8887f0d32274442ea7b21449b48f27c.1560043151.git.fthain@telegraphics.com.au (mailing list archive)
State Mainlined
Commit 7c1f3e3447a13a91e95fff6bac7312858c90b0cf
Headers show
Series NCR5380 drivers: fixes and other improvements | expand

Commit Message

Finn Thain June 9, 2019, 1:19 a.m. UTC 
A system bus error during a PDMA send operation can result in bytes being
lost. Theoretically that could cause the target to remain in DATA OUT
phase and the initiator (expecting a phase change) would time-out waiting
for the Last Byte Sent flag. Should that happen, fail the transfer so the
core driver will stop using PDMA with this target.

Cc: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
---
 drivers/scsi/mac_scsi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/scsi/mac_scsi.c b/drivers/scsi/mac_scsi.c
index 8fbec1768bbf..658a719cfcba 100644
--- a/drivers/scsi/mac_scsi.c
+++ b/drivers/scsi/mac_scsi.c
@@ -360,9 +360,12 @@  static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
 		if (hostdata->pdma_residual == 0) {
 			if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
 			                          TCR_LAST_BYTE_SENT,
-			                          TCR_LAST_BYTE_SENT, HZ / 64) < 0)
+			                          TCR_LAST_BYTE_SENT,
+			                          HZ / 64) < 0) {
 				scmd_printk(KERN_ERR, hostdata->connected,
 				            "%s: Last Byte Sent timeout\n", __func__);
+				result = -1;
+			}
 			goto out;
 		}