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usb: musb: host: Handle highmem in PIO mode

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In case of USB bulk transfer, when himem page
is received, the usb_sg_init function sets the
urb transfer buffer to NULL. When such URB
transfer is handled, kernel crashes in PIO mode.
Handle this by mapping the highmem buffer in PIO mode.

Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
Signed-off-by: Praveena NADAHALLY <praveen.nadahally@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Virupax Sadashivpetimath
2012-08-07 14:46:20 +05:30
committed by Felipe Balbi
parent decadacbd7
commit 8e8a551654
2 changed files with 96 additions and 5 deletions
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3
drivers/usb/musb/musb_host.h
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@@ -35,6 +35,8 @@
#ifndef _MUSB_HOST_H
#define _MUSB_HOST_H
#include <linux/scatterlist.h>
static inline struct usb_hcd *musb_to_hcd(struct musb *musb)
{
return container_of((void *) musb, struct usb_hcd, hcd_priv);
@@ -71,6 +73,7 @@ struct musb_qh {
u16 maxpacket;
u16 frame; /* for periodic schedule */
unsigned iso_idx; /* in urb->iso_frame_desc[] */
struct sg_mapping_iter sg_miter; /* for highmem in PIO mode */
};
/* map from control or bulk queue head to the first qh on that ring */