From: Vivek Gautam <gautam.vivek@samsung.com>
Date: Mon, 13 May 2013 10:23:37 +0000 (+0530)
Subject: usb: Use get_unaligned() in usb_endpoint_maxp() for wMaxPacketSize
X-Git-Tag: v2013.07-rc1~3^2~8
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=f903a20d1fc0e99741da671095c6b9ac7c13c7ae;p=oweals%2Fu-boot.git

usb: Use get_unaligned() in usb_endpoint_maxp() for wMaxPacketSize

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@samsung.com>
Cc: Ilya Yanok <ilya.yanok@cogentembedded.com>
Cc: Marek Vasut <marex@denx.de>
---

diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index d1d732c283..bd48704c87 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(