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usb: wusbcore: preserve endianness of cached descriptors 

Do not overwrite the multi-byte fields of usb_wa_descriptor with their
cpu format values after reading the descriptor.  Leave the values as
__le16 and swap on use.  This is more consistent with other uses of USB
descriptors.

Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Pugliese 2013-10-07 10:07:51 -05:00 committed by Greg Kroah-Hartman
parent 679ee475a1
commit 1653d2f88f
3 changed files with 7 additions and 11 deletions
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10
drivers/usb/host/hwa-hc.c
View File

@ -570,14 +570,10 @@ found:
goto error;
}
wa->wa_descr = wa_descr = (struct usb_wa_descriptor *) hdr;
/* Make LE fields CPU order */
wa_descr->bcdWAVersion = le16_to_cpu(wa_descr->bcdWAVersion);
wa_descr->wNumRPipes = le16_to_cpu(wa_descr->wNumRPipes);
wa_descr->wRPipeMaxBlock = le16_to_cpu(wa_descr->wRPipeMaxBlock);
if (wa_descr->bcdWAVersion > 0x0100)
if (le16_to_cpu(wa_descr->bcdWAVersion) > 0x0100)
dev_warn(dev, "Wire Adapter v%d.%d newer than groked v1.0\n",
wa_descr->bcdWAVersion & 0xff00 >> 8,
wa_descr->bcdWAVersion & 0x00ff);
le16_to_cpu(wa_descr->bcdWAVersion) & 0xff00 >> 8,
le16_to_cpu(wa_descr->bcdWAVersion) & 0x00ff);
result = 0;
error:
return result;

2
drivers/usb/wusbcore/wa-rpipe.c
View File

@ -480,7 +480,7 @@ error:
*/
int wa_rpipes_create(struct wahc *wa)
{
wa->rpipes = wa->wa_descr->wNumRPipes;
wa->rpipes = le16_to_cpu(wa->wa_descr->wNumRPipes);
wa->rpipe_bm = kzalloc(BITS_TO_LONGS(wa->rpipes)*sizeof(unsigned long),
GFP_KERNEL);
if (wa->rpipe_bm == NULL)

6
include/linux/usb/wusb-wa.h
View File

@ -279,11 +279,11 @@ struct wa_xfer_result {
struct usb_wa_descriptor {
u8 bLength;
u8 bDescriptorType;
u16 bcdWAVersion;
__le16 bcdWAVersion;
u8 bNumPorts; /* don't use!! */
u8 bmAttributes; /* Reserved == 0 */
u16 wNumRPipes;
u16 wRPipeMaxBlock;
__le16 wNumRPipes;
__le16 wRPipeMaxBlock;
u8 bRPipeBlockSize;
u8 bPwrOn2PwrGood;
u8 bNumMMCIEs;