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authorDan Williams <dan.j.williams@intel.com>2015-01-16 15:13:02 -0800
committerTejun Heo <tj@kernel.org>2015-01-19 09:10:07 -0500
commit72dd299d5039a336493993dcc63413cf31d0e662 (patch)
tree0fff3d311e7afa17c0b46cb8b19024c64086b2ce /drivers/ata
parent19406d7d9512254d1a467997101bb77b090a44be (diff)
libata: allow sata_sil24 to opt-out of tag ordered submission
Ronny reports: https://bugzilla.kernel.org/show_bug.cgi?id=87101 "Since commit 8a4aeec8d "libata/ahci: accommodate tag ordered controllers" the access to the harddisk on the first SATA-port is failing on its first access. The access to the harddisk on the second port is working normal. When reverting the above commit, access to both harddisks is working fine again." Maintain tag ordered submission as the default, but allow sata_sil24 to continue with the old behavior. Cc: <stable@vger.kernel.org> Cc: Tejun Heo <tj@kernel.org> Reported-by: Ronny Hegewald <Ronny.Hegewald@online.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-core.c5
-rw-r--r--drivers/ata/sata_sil24.c2
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 23c2ae03a7ab..d1a05f9bb91f 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4771,7 +4771,10 @@ static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
return NULL;
for (i = 0, tag = ap->last_tag + 1; i < max_queue; i++, tag++) {
- tag = tag < max_queue ? tag : 0;
+ if (ap->flags & ATA_FLAG_LOWTAG)
+ tag = i;
+ else
+ tag = tag < max_queue ? tag : 0;
/* the last tag is reserved for internal command. */
if (tag == ATA_TAG_INTERNAL)
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index d81b20ddb527..ea655949023f 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -246,7 +246,7 @@ enum {
/* host flags */
SIL24_COMMON_FLAGS = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA |
ATA_FLAG_NCQ | ATA_FLAG_ACPI_SATA |
- ATA_FLAG_AN | ATA_FLAG_PMP,
+ ATA_FLAG_AN | ATA_FLAG_PMP | ATA_FLAG_LOWTAG,
SIL24_FLAG_PCIX_IRQ_WOC = (1 << 24), /* IRQ loss errata on PCI-X */
IRQ_STAT_4PORTS = 0xf,