[PATCH] Snoop SET FEATURES - WRITE CACHE ENABLE/DISABLE command(v5)
This patch makes libata snoop 'SET FEATURES - WRITE CACHE
ENABLE/DISABLE' command, executing requisite revalidation processes
to update cached data.
Signed-off-by: Forrest Zhao <forrest.zhao@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 51b3a0d..ddaad1a 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -5194,6 +5194,7 @@
INIT_WORK(&ap->port_task, NULL, NULL);
INIT_WORK(&ap->hotplug_task, ata_scsi_hotplug, ap);
+ INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan, ap);
INIT_LIST_HEAD(&ap->eh_done_q);
init_waitqueue_head(&ap->eh_wait_q);
diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index 6285257..f82799e 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -1554,6 +1554,9 @@
if (rc)
break;
+ /* schedule the scsi_rescan_device() here */
+ queue_work(ata_aux_wq, &(ap->scsi_rescan_task));
+
ehc->i.action &= ~ATA_EH_REVALIDATE;
} else if (dev->class == ATA_DEV_UNKNOWN &&
ehc->tries[dev->devno] &&
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 5f90d8e..45a49be 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -1306,6 +1306,17 @@
u8 *cdb = cmd->cmnd;
int need_sense = (qc->err_mask != 0);
+ /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
+ * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
+ * cache
+ */
+ if (!need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
+ ((qc->tf.feature == SETFEATURES_WC_ON) ||
+ (qc->tf.feature == SETFEATURES_WC_OFF))) {
+ qc->ap->eh_info.action |= ATA_EH_REVALIDATE;
+ ata_port_schedule_eh(qc->ap);
+ }
+
/* For ATA pass thru (SAT) commands, generate a sense block if
* user mandated it or if there's an error. Note that if we
* generate because the user forced us to, a check condition
@@ -2992,3 +3003,28 @@
return rc;
}
+
+/**
+ * ata_scsi_dev_rescan - initiate scsi_rescan_device()
+ * @data: Pointer to ATA port to perform scsi_rescan_device()
+ *
+ * After ATA pass thru (SAT) commands are executed successfully,
+ * libata need to propagate the changes to SCSI layer.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+void ata_scsi_dev_rescan(void *data)
+{
+ struct ata_port *ap = data;
+ struct ata_device *dev;
+ unsigned int i;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ dev = &ap->device[i];
+
+ if (ata_dev_enabled(dev))
+ scsi_rescan_device(&(dev->sdev->sdev_gendev));
+ }
+}
+
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index 1dd496f..bdd4888 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -104,6 +104,7 @@
unsigned int (*actor) (struct ata_scsi_args *args,
u8 *rbuf, unsigned int buflen));
extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
+extern void ata_scsi_dev_rescan(void *data);
/* libata-eh.c */
extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);