usb: cdc-wdm: Fix submission of URB after suspension
There's a window under which cdc-wdm may submit
an URB to a device about to be suspended. This
introduces a flag to prevent it.
Signed-off-by: Oliver Neukum <neukum@b1-systems.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 72e2eb0..a6b5e9f 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -53,7 +53,7 @@
#define WDM_INT_STALL 5
#define WDM_POLL_RUNNING 6
#define WDM_RESPONDING 7
-
+#define WDM_SUSPENDING 8
#define WDM_MAX 16
@@ -231,7 +231,8 @@
spin_lock(&desc->iuspin);
clear_bit(WDM_READ, &desc->flags);
set_bit(WDM_RESPONDING, &desc->flags);
- if (!test_bit(WDM_DISCONNECTING, &desc->flags)) {
+ if (!test_bit(WDM_DISCONNECTING, &desc->flags)
+ && !test_bit(WDM_SUSPENDING, &desc->flags)) {
rv = usb_submit_urb(desc->response, GFP_ATOMIC);
dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d",
__func__, rv);
@@ -800,6 +801,7 @@
rv = -EBUSY;
} else {
#endif
+ set_bit(WDM_SUSPENDING, &desc->flags);
cancel_work_sync(&desc->rxwork);
kill_urbs(desc);
#ifdef CONFIG_PM
@@ -830,6 +832,7 @@
dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
mutex_lock(&desc->lock);
rv = recover_from_urb_loss(desc);
+ clear_bit(WDM_SUSPENDING, &desc->flags);
mutex_unlock(&desc->lock);
return rv;
}