uas: Add suspend/resume support

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 8023944f2501..7a16ed8e8aac 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -1091,6 +1091,45 @@ static int uas_post_reset(struct usb_interface *intf)
         return 0;
 }
 
+static int uas_suspend(struct usb_interface *intf, pm_message_t message)
+{
+        struct Scsi_Host *shost = usb_get_intfdata(intf);
+        struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
+
+        /* Wait for any pending requests to complete */
+        flush_work(&devinfo->work);
+        if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000) == 0) {
+                shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
+                return -ETIME;
+        }
+
+        return 0;
+}
+
+static int uas_resume(struct usb_interface *intf)
+{
+        return 0;
+}
+
+static int uas_reset_resume(struct usb_interface *intf)
+{
+        struct Scsi_Host *shost = usb_get_intfdata(intf);
+        struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
+        unsigned long flags;
+
+        if (uas_configure_endpoints(devinfo) != 0) {
+                shost_printk(KERN_ERR, shost,
+                             "%s: alloc streams error after reset", __func__);
+                return -EIO;
+        }
+
+        spin_lock_irqsave(shost->host_lock, flags);
+        scsi_report_bus_reset(shost, 0);
+        spin_unlock_irqrestore(shost->host_lock, flags);
+
+        return 0;
+}
+
 static void uas_disconnect(struct usb_interface *intf)
 {
         struct Scsi_Host *shost = usb_get_intfdata(intf);
@@ -1114,6 +1153,9 @@ static struct usb_driver uas_driver = {
         .disconnect = uas_disconnect,
         .pre_reset = uas_pre_reset,
         .post_reset = uas_post_reset,
+        .suspend = uas_suspend,
+        .resume = uas_resume,
+        .reset_resume = uas_reset_resume,
         .id_table = uas_usb_ids,
 };