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path: root/drivers/usb/gadget/pxa27x_udc.h
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Diffstat (limited to 'drivers/usb/gadget/pxa27x_udc.h')
-rw-r--r--drivers/usb/gadget/pxa27x_udc.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/gadget/pxa27x_udc.h b/drivers/usb/gadget/pxa27x_udc.h
index e25225e26586..ff61e4866e8a 100644
--- a/drivers/usb/gadget/pxa27x_udc.h
+++ b/drivers/usb/gadget/pxa27x_udc.h
@@ -318,6 +318,11 @@ struct udc_usb_ep {
* @queue: requests queue
* @lock: lock to pxa_ep data (queues and stats)
* @enabled: true when endpoint enabled (not stopped by gadget layer)
+ * @in_handle_ep: number of recursions of handle_ep() function
+ * Prevents deadlocks or infinite recursions of types :
+ * irq->handle_ep()->req_done()->req.complete()->pxa_ep_queue()->handle_ep()
+ * or
+ * pxa_ep_queue()->handle_ep()->req_done()->req.complete()->pxa_ep_queue()
* @idx: endpoint index (1 => epA, 2 => epB, ..., 24 => epX)
* @name: endpoint name (for trace/debug purpose)
* @dir_in: 1 if IN endpoint, 0 if OUT endpoint
@@ -346,6 +351,7 @@ struct pxa_ep {
spinlock_t lock; /* Protects this structure */
/* (queues, stats) */
unsigned enabled:1;
+ unsigned in_handle_ep:1;
unsigned idx:5;
char *name;