Since commit 058e55e120ca which fixed that commands without valid
error/status codes did not result in any sense error, the returned sense
errors were completely bogus as ata_to_sense_error did not have valid
inputs in the first place.
For example the following ATA error
exception Emask 0x10 SAct 0x20c000 SErr 0x280100 action 0x6 frozen
irq_stat 0x08000000, interface fatal error
SError: { UnrecovData 10B8B BadCRC }
failed command: READ FPDMA QUEUED
cmd 60/e0:70:20:0a:00/00:00:00:00:00/40 tag 14 ncq dma 114688 in
res 40/00:ac:20:5e:50/00:00:5d:01:00/40 Emask 0x10 (ATA bus error)
status: { DRDY }
got turned into the following nonsensical SCSI error
FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
Sense Key : Illegal Request [current]
Add. Sense: Unaligned write command
CDB: Read(16) 88 00 00 00 00 00 00 00 0a 20 00 00 00 e0 00 00
This has nothing to do with an unaligned write command, but is due to an
ATA EH-triggered abort. But ata_to_sense_error only knows about
status and error, both of which aren't even valid here as the command
has been aborted.
Add an additional section to ata_gen_ata_sense which handles
errors not coming from the device first, before calling into
ata_to_sense_error.
According to the SAT-5 spec a reset should cause a Unit Attention event,
which the SCSI subsystem should handle to retry its commands but I
am not sure how much of that infra is present in Linux's SCSI layer, so
this is a simpler solution.
Signed-off-by: Lorenz Brun <lorenz@xxxxxxxx>
---
drivers/ata/libata-scsi.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 551077cea4e4..61c6a4e8123a 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -13,6 +13,7 @@
* - http://www.t13.org/
*/
+#include "scsi/scsi_proto.h"
#include <linux/compat.h>
#include <linux/slab.h>
#include <linux/kernel.h>
@@ -1013,6 +1014,21 @@ static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21);
return;
}
+ if (qc->err_mask & (AC_ERR_HSM | AC_ERR_ATA_BUS | AC_ERR_HOST_BUS |
+ AC_ERR_SYSTEM | AC_ERR_OTHER)) {
+ /* Command aborted because of some issue with the ATA subsystem
+ * Should technically cause unit attention, but this is better
+ * than nothing, which results in nonsensical errors.
+ * POWER ON, RESET, OR BUS DEVICE RESET OCCURRED
+ */
+ ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0x29, 0x00);
+ return;
+ }
+ if (qc->err_mask & AC_ERR_TIMEOUT) {
+ /* COMMAND TIMEOUT DURING PROCESSING */
+ ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0x2e, 0x02);
+ return;
+ }
/* Use ata_to_sense_error() to map status register bits
* onto sense key, asc & ascq.
*/
--
2.40.1
