Commit 2db03a7f authored by Yoshihiro Shimoda's avatar Yoshihiro Shimoda Committed by Greg Kroah-Hartman

usb: gadget: udc: renesas_usb3: Fix usb_gadget_giveback_request() calling

commit aca5b9eb upstream.

According to the gadget.h, a "complete" function will always be called
with interrupts disabled. However, sometimes usb3_request_done() function
is called with interrupts enabled. So, this function should be held
by spin_lock_irqsave() to disable interruption. Also, this driver has
to call spin_unlock() to avoid spinlock recursion by this driver before
calling usb_gadget_giveback_request().
Reported-by: default avatarKazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
Tested-by: default avatarKazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
Fixes: 746bfe63 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller")
Signed-off-by: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a09ecc93
......@@ -685,21 +685,32 @@ static struct renesas_usb3_request *usb3_get_request(struct renesas_usb3_ep
return usb3_req;
}
static void usb3_request_done(struct renesas_usb3_ep *usb3_ep,
struct renesas_usb3_request *usb3_req, int status)
static void __usb3_request_done(struct renesas_usb3_ep *usb3_ep,
struct renesas_usb3_request *usb3_req,
int status)
{
struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
unsigned long flags;
dev_dbg(usb3_to_dev(usb3), "giveback: ep%2d, %u, %u, %d\n",
usb3_ep->num, usb3_req->req.length, usb3_req->req.actual,
status);
usb3_req->req.status = status;
spin_lock_irqsave(&usb3->lock, flags);
usb3_ep->started = false;
list_del_init(&usb3_req->queue);
spin_unlock_irqrestore(&usb3->lock, flags);
spin_unlock(&usb3->lock);
usb_gadget_giveback_request(&usb3_ep->ep, &usb3_req->req);
spin_lock(&usb3->lock);
}
static void usb3_request_done(struct renesas_usb3_ep *usb3_ep,
struct renesas_usb3_request *usb3_req, int status)
{
struct renesas_usb3 *usb3 = usb3_ep_to_usb3(usb3_ep);
unsigned long flags;
spin_lock_irqsave(&usb3->lock, flags);
__usb3_request_done(usb3_ep, usb3_req, status);
spin_unlock_irqrestore(&usb3->lock, flags);
}
static void usb3_irq_epc_pipe0_status_end(struct renesas_usb3 *usb3)
......
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