From: Du Xing duxing2007@xxxxxxxxx
In skel_read,the reader blocked in wait_for_completion before submit bulk in urb.
Using processed_urb is totally unnecessary, remove it can fix the bug.
---
Signed-off-by: Du Xing duxing2007@xxxxxxxxx
---
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index ce31017..14e4889 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -61,7 +61,6 @@ struct usb_skel {
__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
int errors; /* the last request tanked */
bool ongoing_read; /* a read is going on */
- bool processed_urb; /* indicates we haven't processed the urb */
spinlock_t err_lock; /* lock for errors */
struct kref kref;
struct mutex io_mutex; /* synchronize I/O with disconnect */
@@ -269,17 +268,6 @@ retry:
* we must finish now
*/
dev->bulk_in_copied = 0;
- dev->processed_urb = 1;
- }
-
- if (!dev->processed_urb) {
- /*
- * the URB hasn't been processed
- * do it now
- */
- wait_for_completion(&dev->bulk_in_completion);
- dev->bulk_in_copied = 0;
- dev->processed_urb = 1;
}
/* errors must be reported */?韬{.n?????%??檩??w?{.n???{炳???骅w* jg????????G??⒏ ⒎?:+v???????? ????＂??????
