[U-Boot] [PATCH 1/2] usb: Use get_unaligned() in usb_endpoint_maxp() for wMaxPacketSize
Vivek Gautam
gautam.vivek at samsung.com
Mon May 13 12:23:37 CEST 2013
Use unaligned access to fetch wMaxPacketSize in usb_endpoint_maxp()
api.
In its absence we see following data abort message:
==============================================================
data abort
MAYBE you should read doc/README.arm-unaligned-accesses
pc : [<bf794e24>] lr : [<bf794e1c>]
sp : bf37c7b0 ip : 0000002f fp : 00000000
r10: 00000000 r9 : 00000002 r8 : bf37fecc
r7 : 00000001 r6 : bf7d8931 r5 : bf7d891c r4 : bf7d8800
r3 : bf7d65b0 r2 : 00000002 r1 : bf7d65b4 r0 : 00000027
Flags: nZCv IRQs off FIQs off Mode SVC_32
Resetting CPU ...
resetting ...
==============================================================
Signed-off-by: Vivek Gautam <gautam.vivek at samsung.com>
Cc: Ilya Yanok <ilya.yanok at cogentembedded.com>
Cc: Marek Vasut <marex at denx.de>
---
Based on u-boot-usb/next. Tested with 'u-boot-usb/master' branch.
include/linux/usb/ch9.h | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index d1d732c..bd48704 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -35,6 +35,7 @@
#include <linux/types.h> /* __u8 etc */
#include <asm/byteorder.h> /* le16_to_cpu */
+#include <asm/unaligned.h> /* get_unaligned() */
/*-------------------------------------------------------------------------*/
@@ -596,7 +597,7 @@ static inline int usb_endpoint_is_isoc_out(
*/
static inline int usb_endpoint_maxp(const struct usb_endpoint_descriptor *epd)
{
- return __le16_to_cpu(epd->wMaxPacketSize);
+ return __le16_to_cpu(get_unaligned(&epd->wMaxPacketSize));
}
static inline int usb_endpoint_interrupt_type(
--
1.7.6.5
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