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USB: Use (get|put)_unaligned for accessing wMaxPacketSize

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In 9792987721 Stefan describes a usecase
where the previous behavior of leaving wMaxPacketSize be unaligned
caused fatal problems.  The initial fix for this problem was incomplete
however as it showed another cases of non-aligned access that previously
worked implicitly.  This switches to making sure that all access of
wMaxPacketSize are done via (get|put)_unaligned.

In order to maintain a level of readability to the code in some cases
we now use a variable for the value of wMaxPacketSize and in others, a
macro.

Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Remy Bohmer <linux@bohmer.net>

OpenRISC:
Tested-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>

Beagleboard xM, Pandaboard run-tested, s5p_goni build-tested.
Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Tom Rini
2011-12-15 08:40:51 -07:00
committed by Remy Bohmer
parent ddc7e541ae
commit b2fb47f187
6 changed files with 39 additions and 21 deletions
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3
common/cmd_usb.c
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@ -28,6 +28,7 @@
#include <common.h>
#include <command.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <part.h>
#include <usb.h>
@ -240,7 +241,7 @@ void usb_display_ep_desc(struct usb_endpoint_descriptor *epdesc)
printf("Interrupt");
break;
}
printf(" MaxPacket %d", epdesc->wMaxPacketSize);
printf(" MaxPacket %d", get_unaligned(&epdesc->wMaxPacketSize));
if ((epdesc->bmAttributes & 0x03) == 0x3)
printf(" Interval %dms", epdesc->bInterval);
printf("\n");