Revert "usb-storage: implement autosuspend"

This reverts commit 8dfe4b14869fd185ca25ee88b02ada58a3005eaf.

There are a number of issues still remaining in usb-storage autosuspend,
so, to be safe, we need to revert this for now.

Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 11 insertions, 29 deletions

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 47e56079925..1ba19eaa197 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -285,15 +285,10 @@ static int device_reset(struct scsi_cmnd *srb)
 
         US_DEBUGP("%s called\n", __FUNCTION__);
 
-        result = usb_autopm_get_interface(us->pusb_intf);
-        if (result == 0) {
-
-                /* lock the device pointers and do the reset */
-                mutex_lock(&(us->dev_mutex));
-                result = us->transport_reset(us);
-                mutex_unlock(&us->dev_mutex);
-                usb_autopm_put_interface(us->pusb_intf);
-        }
+        /* lock the device pointers and do the reset */
+        mutex_lock(&(us->dev_mutex));
+        result = us->transport_reset(us);
+        mutex_unlock(&us->dev_mutex);
 
         return result < 0 ? FAILED : SUCCESS;
 }
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index 25e557d4fe6..59181667066 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -184,14 +184,16 @@ static int storage_suspend(struct usb_interface *iface, pm_message_t message)
 {
         struct us_data *us = usb_get_intfdata(iface);
 
-        US_DEBUGP("%s\n", __FUNCTION__);
-
         /* Wait until no command is running */
         mutex_lock(&us->dev_mutex);
 
+        US_DEBUGP("%s\n", __FUNCTION__);
         if (us->suspend_resume_hook)
                 (us->suspend_resume_hook)(us, US_SUSPEND);
 
+        /* When runtime PM is working, we'll set a flag to indicate
+         * whether we should autoresume when a SCSI request arrives. */
+
         mutex_unlock(&us->dev_mutex);
         return 0;
 }
@@ -200,11 +202,13 @@ static int storage_resume(struct usb_interface *iface)
 {
         struct us_data *us = usb_get_intfdata(iface);
 
-        US_DEBUGP("%s\n", __FUNCTION__);
+        mutex_lock(&us->dev_mutex);
 
+        US_DEBUGP("%s\n", __FUNCTION__);
         if (us->suspend_resume_hook)
                 (us->suspend_resume_hook)(us, US_RESUME);
 
+        mutex_unlock(&us->dev_mutex);
         return 0;
 }
 
@@ -302,7 +306,6 @@ static int usb_stor_control_thread(void * __us)
 {
         struct us_data *us = (struct us_data *)__us;
         struct Scsi_Host *host = us_to_host(us);
-        int autopm_rc;
 
         for(;;) {
                 US_DEBUGP("*** thread sleeping.\n");
@@ -311,9 +314,6 @@ static int usb_stor_control_thread(void * __us)
                         
                 US_DEBUGP("*** thread awakened.\n");
 
-                /* Autoresume the device */
-                autopm_rc = usb_autopm_get_interface(us->pusb_intf);
-
                 /* lock the device pointers */
                 mutex_lock(&(us->dev_mutex));
 
@@ -372,12 +372,6 @@ static int usb_stor_control_thread(void * __us)
                         us->srb->result = SAM_STAT_GOOD;
                 }
 
-                /* Did the autoresume fail? */
-                else if (autopm_rc < 0) {
-                        US_DEBUGP("Could not wake device\n");
-                        us->srb->result = DID_ERROR << 16;
-                }
-
                 /* we've got a command, let's do it! */
                 else {
                         US_DEBUG(usb_stor_show_command(us->srb));
@@ -420,10 +414,6 @@ SkipForAbort:
 
                 /* unlock the device pointers */
                 mutex_unlock(&us->dev_mutex);
-
-                /* Start an autosuspend */
-                if (autopm_rc == 0)
-                        usb_autopm_put_interface(us->pusb_intf);
         } /* for (;;) */
 
         /* Wait until we are told to stop */
@@ -941,7 +931,6 @@ retry:
                 /* Should we unbind if no devices were detected? */
         }
 
-        usb_autopm_put_interface(us->pusb_intf);
         complete_and_exit(&us->scanning_done, 0);
 }
 
@@ -1027,7 +1016,6 @@ static int storage_probe(struct usb_interface *intf,
                 goto BadDevice;
         }
 
-        usb_autopm_get_interface(intf); /* dropped in the scanning thread */
         wake_up_process(th);
 
         return 0;
@@ -1065,7 +1053,6 @@ static struct usb_driver usb_storage_driver = {
         .pre_reset =    storage_pre_reset,
         .post_reset =   storage_post_reset,
         .id_table =     storage_usb_ids,
-        .supports_autosuspend = 1,
 };
 
 static int __init usb_stor_init(void)