bdc: Fix bug causing crash after multiple disconnects

[ Upstream commit a95bdfd22076497288868c028619bc5995f5cc7f ]

Multiple connects/disconnects can cause a crash on the second
disconnect. The driver had a problem where it would try to send
endpoint commands after it was disconnected which is not allowed
by the hardware. The fix is to only allow the endpoint commands
when the endpoint is connected. This will also fix issues that
showed up when using configfs to create gadgets.

Signed-off-by: Sasi Kumar <sasi.kumar@broadcom.com>
Signed-off-by: Al Cooper <alcooperx@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c
index cc4a16e253ac5c5c1d2b449e0473da6cac647f45..174555e94a6c00c3e858082d1dab6ccfa2da2495 100644 (file)
--- a/drivers/usb/gadget/udc/bdc/bdc_core.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
@@ -282,6 +282,7 @@ static void bdc_mem_init(struct bdc *bdc, bool reinit)
         * in that case reinit is passed as 1
         */
        if (reinit) {
+               int i;
                /* Enable interrupts */
                temp = bdc_readl(bdc->regs, BDC_BDCSC);
                temp |= BDC_GIE;
@@ -291,6 +292,9 @@ static void bdc_mem_init(struct bdc *bdc, bool reinit)
                /* Initialize SRR to 0 */
                memset(bdc->srr.sr_bds, 0,
                                        NUM_SR_ENTRIES * sizeof(struct bdc_bd));
+               /* clear ep flags to avoid post disconnect stops/deconfigs */
+               for (i = 1; i < bdc->num_eps; ++i)
+                       bdc->bdc_ep_array[i]->flags = 0;
        } else {
                /* One time initiaization only */
                /* Enable status report function pointers */

diff --git a/drivers/usb/gadget/udc/bdc/bdc_ep.c b/drivers/usb/gadget/udc/bdc/bdc_ep.c
index d49c6dc1082dc980b47620a63fb28e35f5780c67..9ddc0b4e92c9c94235cb24a5e5d90a6e7682a96d 100644 (file)
--- a/drivers/usb/gadget/udc/bdc/bdc_ep.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_ep.c
@@ -615,7 +615,6 @@ int bdc_ep_enable(struct bdc_ep *ep)
        }
        bdc_dbg_bd_list(bdc, ep);
        /* only for ep0: config ep is called for ep0 from connect event */
-       ep->flags |= BDC_EP_ENABLED;
        if (ep->ep_num == 1)
                return ret;
 
@@ -759,10 +758,13 @@ static int ep_dequeue(struct bdc_ep *ep, struct bdc_req *req)
                                        __func__, ep->name, start_bdi, end_bdi);
        dev_dbg(bdc->dev, "ep_dequeue ep=%p ep->desc=%p\n",
                                                ep, (void *)ep->usb_ep.desc);
-       /* Stop the ep to see where the HW is ? */
-       ret = bdc_stop_ep(bdc, ep->ep_num);
-       /* if there is an issue with stopping ep, then no need to go further */
-       if (ret)
+       /* if still connected, stop the ep to see where the HW is ? */
+       if (!(bdc_readl(bdc->regs, BDC_USPC) & BDC_PST_MASK)) {
+               ret = bdc_stop_ep(bdc, ep->ep_num);
+               /* if there is an issue, then no need to go further */
+               if (ret)
+                       return 0;
+       } else
                return 0;
 
        /*
@@ -1911,7 +1913,9 @@ static int bdc_gadget_ep_disable(struct usb_ep *_ep)
                __func__, ep->name, ep->flags);
 
        if (!(ep->flags & BDC_EP_ENABLED)) {
-               dev_warn(bdc->dev, "%s is already disabled\n", ep->name);
+               if (bdc->gadget.speed != USB_SPEED_UNKNOWN)
+                       dev_warn(bdc->dev, "%s is already disabled\n",
+                                ep->name);
                return 0;
        }
        spin_lock_irqsave(&bdc->lock, flags);