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authorDan Williams <dan.j.williams@intel.com>2014-02-07 00:23:15 +0400
committerJames Bottomley <JBottomley@Parallels.com>2014-03-15 21:18:53 +0400
commit2193b1b16cc7c690f74f917c50004dd00c99088e (patch)
tree3cc6191d585038c9515574a0efdca51117955b20 /drivers/scsi/isci
parent3af74a3c07d93e34fce3d6c6dcd73676d8381d21 (diff)
downloadlinux-2193b1b16cc7c690f74f917c50004dd00c99088e.tar.xz
[SCSI] isci: fix needless ata reset escalations
isci is needlessly tying libata's hands by returning SAM_STAT_CHECK_CONDITION to some ata errors. Instead, prefer SAS_PROTO_RESPONSE to let libata (via sas_ata_task_done()) disposition the device-to-host fis. For example isci is triggering an HSM Violation where AHCI is showing a simple media error for the same bus condition: isci: ata7.00: failed command: READ VERIFY SECTOR(S) ata7.00: cmd 40/00:01:00:00:00/00:00:00:00:00/e0 tag 0 res 01/04:00:00:00:00/00:00:00:00:00/e0 Emask 0x3 (HSM violation) ahci: ata6.00: failed command: READ VERIFY SECTOR(S) ata6.00: cmd 40/00:01:00:00:00/00:00:00:00:00/e0 tag 0 res 51/40:01:00:00:00/00:00:00:00:00/e0 Emask 0x9 (media error) Note that the isci response matches this from sas_ata_task_done(): /* We saw a SAS error. Send a vague error. */ [..] dev->sata_dev.fis[3] = 0x04; /* status err */ dev->sata_dev.fis[2] = ATA_ERR; The end effect is that isci is needlessly triggering hard resets when they are not necessary. Reported-by: Xun Ni <xun.ni@intel.com> Tested-by: Nelson Cheng <nelson.cheng@intel.com> Acked-by: Lukasz Dorau <lukasz.dorau@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/isci')
-rw-r--r--drivers/scsi/isci/request.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 99d2930b18c8..56e38096f0c4 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -2723,13 +2723,9 @@ static void isci_process_stp_response(struct sas_task *task, struct dev_to_host_
memcpy(resp->ending_fis, fis, sizeof(*fis));
ts->buf_valid_size = sizeof(*resp);
- /* If the device fault bit is set in the status register, then
- * set the sense data and return.
- */
- if (fis->status & ATA_DF)
+ /* If an error is flagged let libata decode the fis */
+ if (ac_err_mask(fis->status))
ts->stat = SAS_PROTO_RESPONSE;
- else if (fis->status & ATA_ERR)
- ts->stat = SAM_STAT_CHECK_CONDITION;
else
ts->stat = SAM_STAT_GOOD;