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USB: gadget: Fix "scheduling while atomic" bugs in ci13xxx_udc

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dma_pool_alloc() require sleeping context when called with GFP_KERNEL
argument.  Hence release the spin lock before calling dma_pool_alloc().

usb_ep_alloc_request can also be called with non-atomic GFP flags.  Hence
get rid off spin lock while allocation request memory.

Use GFP_ATOMIC flag for allocating request for ep0 in interrupt handler.

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pavankumar Kondeti 2010-12-07 17:54:00 +05:30 committed by Greg Kroah-Hartman
parent 409a15da98
commit 0a91efa2f9
1 changed files with 3 additions and 6 deletions
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9
drivers/usb/gadget/ci13xxx_udc.c
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@ -1626,7 +1626,7 @@ __acquires(udc->lock)
spin_unlock(udc->lock);
retval = usb_ep_enable(&mEp->ep, &ctrl_endpt_desc);
if (!retval) {
mEp->status = usb_ep_alloc_request(&mEp->ep, GFP_KERNEL);
mEp->status = usb_ep_alloc_request(&mEp->ep, GFP_ATOMIC);
if (mEp->status == NULL) {
usb_ep_disable(&mEp->ep);
retval = -ENOMEM;
@ -2055,7 +2055,6 @@ static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
{
struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
struct ci13xxx_req *mReq = NULL;
unsigned long flags;
trace("%p, %i", ep, gfp_flags);
@ -2064,8 +2063,6 @@ static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
return NULL;
}
spin_lock_irqsave(mEp->lock, flags);
mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
if (mReq != NULL) {
INIT_LIST_HEAD(&mReq->queue);
@ -2080,8 +2077,6 @@ static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
dbg_event(_usb_addr(mEp), "ALLOC", mReq == NULL);
spin_unlock_irqrestore(mEp->lock, flags);
return (mReq == NULL) ? NULL : &mReq->req;
}
@ -2404,9 +2399,11 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
/* this allocation cannot be random */
for (k = RX; k <= TX; k++) {
INIT_LIST_HEAD(&mEp->qh[k].queue);
spin_unlock_irqrestore(udc->lock, flags);
mEp->qh[k].ptr = dma_pool_alloc(udc->qh_pool,
GFP_KERNEL,
&mEp->qh[k].dma);
spin_lock_irqsave(udc->lock, flags);
if (mEp->qh[k].ptr == NULL)
retval = -ENOMEM;
else