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usb: musb: patches for v3.6 merge window

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Just two patches here:
 
 First we have a fix to disable DMA in case DMA channel
 request fails.
 
 Second, there's a fix for situations where the user
 kills musb (by rmmod or any other means) while a
 transfer is on the fly. In such cases, we could be
 led into a NULL pointer dereference due to endpoint
 being disabled and endpoint descriptor being NULL.
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Merge tag 'musb-for-v3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next

usb: musb: patches for v3.6 merge window

Just two patches here:

First we have a fix to disable DMA in case DMA channel
request fails.

Second, there's a fix for situations where the user
kills musb (by rmmod or any other means) while a
transfer is on the fly. In such cases, we could be
led into a NULL pointer dereference due to endpoint
being disabled and endpoint descriptor being NULL.
This commit is contained in:
Greg Kroah-Hartman 2012-07-05 15:09:27 -07:00
commit 979eef3326
2 changed files with 19 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
drivers/usb/musb/musb_gadget.c
View file

@ -328,6 +328,13 @@ static void txstate(struct musb *musb, struct musb_request *req)
musb_ep = req->ep;
/* Check if EP is disabled */
if (!musb_ep->desc) {
dev_dbg(musb->controller, "ep:%s disabled - ignore request\n",
musb_ep->end_point.name);
return;
}
/* we shouldn't get here while DMA is active ... but we do ... */
if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
dev_dbg(musb->controller, "dma pending...\n");
@ -650,6 +657,13 @@ static void rxstate(struct musb *musb, struct musb_request *req)
len = musb_ep->packet_sz;
/* Check if EP is disabled */
if (!musb_ep->desc) {
dev_dbg(musb->controller, "ep:%s disabled - ignore request\n",
musb_ep->end_point.name);
return;
}
/* We shouldn't get here while DMA is active, but we do... */
if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
dev_dbg(musb->controller, "DMA pending...\n");

6
drivers/usb/musb/musb_host.c
View file

@ -1746,7 +1746,11 @@ void musb_host_rx(struct musb *musb, u8 epnum)
c->channel_release(dma);
hw_ep->rx_channel = NULL;
dma = NULL;
/* REVISIT reset CSR */
val = musb_readw(epio, MUSB_RXCSR);
val &= ~(MUSB_RXCSR_DMAENAB
| MUSB_RXCSR_H_AUTOREQ
| MUSB_RXCSR_AUTOCLEAR);
musb_writew(epio, MUSB_RXCSR, val);
}
}
#endif /* Mentor DMA */