[PATCH] usb-storage: use usb_reset_composite_device

This patch (as701) modifies usb-storage to take advantage of the new
usb_reset_composite_device() API.  Now we will be able to safely request
port resets even if other drivers are bound to a mass-storage device.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index 0142fe82f6b8..e232c7c89909 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -221,6 +221,37 @@ static int storage_resume(struct usb_interface *iface)
 #endif /* CONFIG_PM */
 
 /*
+ * The next two routines get called just before and just after
+ * a USB port reset, whether from this driver or a different one.
+ */
+
+static void storage_pre_reset(struct usb_interface *iface)
+{
+        struct us_data *us = usb_get_intfdata(iface);
+
+        US_DEBUGP("%s\n", __FUNCTION__);
+
+        /* Make sure no command runs during the reset */
+        mutex_lock(&us->dev_mutex);
+}
+
+static void storage_post_reset(struct usb_interface *iface)
+{
+        struct us_data *us = usb_get_intfdata(iface);
+
+        US_DEBUGP("%s\n", __FUNCTION__);
+
+        /* Report the reset to the SCSI core */
+        scsi_lock(us_to_host(us));
+        usb_stor_report_bus_reset(us);
+        scsi_unlock(us_to_host(us));
+
+        /* FIXME: Notify the subdrivers that they need to reinitialize
+         * the device */
+        mutex_unlock(&us->dev_mutex);
+}
+
+/*
  * fill_inquiry_response takes an unsigned char array (which must
  * be at least 36 characters) and populates the vendor name,
  * product name, and revision fields. Then the array is copied
@@ -1002,6 +1033,8 @@ static struct usb_driver usb_storage_driver = {
         .suspend =      storage_suspend,
         .resume =       storage_resume,
 #endif
+        .pre_reset =    storage_pre_reset,
+        .post_reset =   storage_post_reset,
         .id_table =     storage_usb_ids,
 };