USB: cdc-acm.c: fix recursive lock in acm_start_wb error path

[linux-2.6-omap-h63xx.git] / drivers / usb / class / cdc-acm.c

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 20104443081ad1fc260d4ba74f17a0c9828eca69..d50a99f70aee8d33941e5445f62bef41778093d3 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -158,16 +158,12 @@ static int acm_wb_is_avail(struct acm *acm)
 }
 
 /*
- * Finish write.
+ * Finish write. Caller must hold acm->write_lock
  */
 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 {
-       unsigned long flags;
-
-       spin_lock_irqsave(&acm->write_lock, flags);
        wb->use = 0;
        acm->transmitting--;
-       spin_unlock_irqrestore(&acm->write_lock, flags);
 }
 
 /*
@@ -482,6 +478,7 @@ static void acm_write_bulk(struct urb *urb)
 {
        struct acm_wb *wb = urb->context;
        struct acm *acm = wb->instance;
+       unsigned long flags;
 
        if (verbose || urb->status
                        || (urb->actual_length != urb->transfer_buffer_length))
@@ -490,7 +487,9 @@ static void acm_write_bulk(struct urb *urb)
                        urb->transfer_buffer_length,
                        urb->status);
 
+       spin_lock_irqsave(&acm->write_lock, flags);
        acm_write_done(acm, wb);
+       spin_unlock_irqrestore(&acm->write_lock, flags);
        if (ACM_READY(acm))
                schedule_work(&acm->work);
        else