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usb: renesas_usbhs: fix spinlock suspected in a gadget complete function 

According to the gadget.h, a "complete" function will always be called
with interrupts disabled. However, sometimes usbhsg_queue_pop() function
is called with interrupts enabled. So, this function should be held by
usbhs_lock() to disable interruption. Also, this driver has to call
spin_unlock() to avoid spinlock recursion by this driver before calling
usb_gadget_giveback_request().
Otherwise, there is possible to cause a spinlock suspected in a gadget
complete function.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Yoshihiro Shimoda 2015-03-16 16:36:48 +09:00 committed by Felipe Balbi
parent 990919cad5
commit 00f30d29b4
1 changed files with 22 additions and 6 deletions
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28
drivers/usb/renesas_usbhs/mod_gadget.c
View File

@ -119,18 +119,34 @@ struct usbhsg_recip_handle {
/*
* queue push/pop
*/
static void __usbhsg_queue_pop(struct usbhsg_uep *uep,
struct usbhsg_request *ureq,
int status)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
ureq->req.status = status;
spin_unlock(usbhs_priv_to_lock(priv));
usb_gadget_giveback_request(&uep->ep, &ureq->req);
spin_lock(usbhs_priv_to_lock(priv));
}
static void usbhsg_queue_pop(struct usbhsg_uep *uep,
struct usbhsg_request *ureq,
int status)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
unsigned long flags;
dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
ureq->req.status = status;
usb_gadget_giveback_request(&uep->ep, &ureq->req);
usbhs_lock(priv, flags);
__usbhsg_queue_pop(uep, ureq, status);
usbhs_unlock(priv, flags);
}
static void usbhsg_queue_done(struct usbhs_priv *priv, struct usbhs_pkt *pkt)