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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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2
include/usbdescriptors.h
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@ -199,7 +199,7 @@ struct usb_endpoint_descriptor {
u8 bmAttributes;
u16 wMaxPacketSize;
u8 bInterval;
} __attribute__ ((packed)) __attribute__ ((aligned(2)));
} __attribute__ ((packed));
struct usb_interface_descriptor {
u8 bLength;