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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2008-01-28 16:08:23 +0000
committerJeff Garzik <jeff@garzik.org>2008-02-01 12:26:40 -0500
commit92ba5d02d993ccf4a87b945779fe052f67c3c334 (patch)
tree83bec429c99badb5b95efadc3d4fefd14290c2e5 /drivers/ata/pata_sl82c105.c
parent4a537a5518e81dba342eccbffcfa5c27cb5781d4 (diff)
pata_sl82c105: dual channel support
Use qc_defer to serialize the two channels Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/pata_sl82c105.c')
-rw-r--r--drivers/ata/pata_sl82c105.c33
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/ata/pata_sl82c105.c b/drivers/ata/pata_sl82c105.c
index 1388cef52c0..81ef207f826 100644
--- a/drivers/ata/pata_sl82c105.c
+++ b/drivers/ata/pata_sl82c105.c
@@ -26,7 +26,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_sl82c105"
-#define DRV_VERSION "0.3.2"
+#define DRV_VERSION "0.3.3"
enum {
/*
@@ -206,6 +206,34 @@ static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
sl82c105_set_piomode(ap, qc->dev);
}
+/**
+ * sl82c105_qc_defer - implement serialization
+ * @qc: command
+ *
+ * We must issue one command per host not per channel because
+ * of the reset bug.
+ *
+ * Q: is the scsi host lock sufficient ?
+ */
+
+static int sl82c105_qc_defer(struct ata_queued_cmd *qc)
+{
+ struct ata_host *host = qc->ap->host;
+ struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
+ int rc;
+
+ /* First apply the usual rules */
+ rc = ata_std_qc_defer(qc);
+ if (rc != 0)
+ return rc;
+
+ /* Now apply serialization rules. Only allow a command if the
+ other channel state machine is idle */
+ if (alt && alt->qc_active)
+ return ATA_DEFER_PORT;
+ return 0;
+}
+
static struct scsi_host_template sl82c105_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
@@ -245,6 +273,7 @@ static struct ata_port_operations sl82c105_port_ops = {
.bmdma_stop = sl82c105_bmdma_stop,
.bmdma_status = ata_bmdma_status,
+ .qc_defer = sl82c105_qc_defer,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
@@ -312,7 +341,7 @@ static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id
};
/* for now use only the first port */
const struct ata_port_info *ppi[] = { &info_early,
- &ata_dummy_port_info };
+ NULL };
u32 val;
int rev;