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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
common/cmd_usb.c
View File

@ -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");

27
common/usb.c
View File

@ -49,6 +49,7 @@
#include <asm/processor.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <usb.h>
#ifdef CONFIG_4xx
@ -279,30 +280,32 @@ usb_set_maxpacket_ep(struct usb_device *dev, int if_idx, int ep_idx)
{
int b;
struct usb_endpoint_descriptor *ep;
u16 ep_wMaxPacketSize;
ep = &dev->config.if_desc[if_idx].ep_desc[ep_idx];
b = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
ep_wMaxPacketSize = get_unaligned(&ep->wMaxPacketSize);
if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_CONTROL) {
/* Control => bidirectional */
dev->epmaxpacketout[b] = ep->wMaxPacketSize;
dev->epmaxpacketin[b] = ep->wMaxPacketSize;
dev->epmaxpacketout[b] = ep_wMaxPacketSize;
dev->epmaxpacketin[b] = ep_wMaxPacketSize;
USB_PRINTF("##Control EP epmaxpacketout/in[%d] = %d\n",
b, dev->epmaxpacketin[b]);
} else {
if ((ep->bEndpointAddress & 0x80) == 0) {
/* OUT Endpoint */
if (ep->wMaxPacketSize > dev->epmaxpacketout[b]) {
dev->epmaxpacketout[b] = ep->wMaxPacketSize;
if (ep_wMaxPacketSize > dev->epmaxpacketout[b]) {
dev->epmaxpacketout[b] = ep_wMaxPacketSize;
USB_PRINTF("##EP epmaxpacketout[%d] = %d\n",
b, dev->epmaxpacketout[b]);
}
} else {
/* IN Endpoint */
if (ep->wMaxPacketSize > dev->epmaxpacketin[b]) {
dev->epmaxpacketin[b] = ep->wMaxPacketSize;
if (ep_wMaxPacketSize > dev->epmaxpacketin[b]) {
dev->epmaxpacketin[b] = ep_wMaxPacketSize;
USB_PRINTF("##EP epmaxpacketin[%d] = %d\n",
b, dev->epmaxpacketin[b]);
}
@ -333,6 +336,7 @@ int usb_parse_config(struct usb_device *dev, unsigned char *buffer, int cfgno)
struct usb_descriptor_header *head;
int index, ifno, epno, curr_if_num;
int i;
u16 ep_wMaxPacketSize;
ifno = -1;
epno = -1;
@ -378,8 +382,15 @@ int usb_parse_config(struct usb_device *dev, unsigned char *buffer, int cfgno)
dev->config.if_desc[ifno].no_of_ep++;
memcpy(&dev->config.if_desc[ifno].ep_desc[epno],
&buffer[index], buffer[index]);
le16_to_cpus(&(dev->config.if_desc[ifno].ep_desc[epno].\
wMaxPacketSize));
ep_wMaxPacketSize = get_unaligned(&dev->config.\
if_desc[ifno].\
ep_desc[epno].\
wMaxPacketSize);
put_unaligned(le16_to_cpu(ep_wMaxPacketSize),
&dev->config.\
if_desc[ifno].\
ep_desc[epno].\
wMaxPacketSize);
USB_PRINTF("if %d, ep %d\n", ifno, epno);
break;
default:

10
drivers/serial/usbtty.c
View File

@ -25,6 +25,7 @@
#include <config.h>
#include <circbuf.h>
#include <stdio_dev.h>
#include <asm/unaligned.h>
#include "usbtty.h"
#include "usb_cdc_acm.h"
#include "usbdescriptors.h"
@ -626,6 +627,9 @@ static void usbtty_init_strings (void)
usb_strings = usbtty_string_table;
}
#define init_wMaxPacketSize(x) le16_to_cpu(get_unaligned(\
&ep_descriptor_ptrs[(x) - 1]->wMaxPacketSize));
static void usbtty_init_instances (void)
{
int i;
@ -688,14 +692,12 @@ static void usbtty_init_instances (void)
endpoint_instance[i].rcv_attributes =
ep_descriptor_ptrs[i - 1]->bmAttributes;
endpoint_instance[i].rcv_packetSize =
le16_to_cpu(ep_descriptor_ptrs[i - 1]->wMaxPacketSize);
endpoint_instance[i].rcv_packetSize = init_wMaxPacketSize(i);
endpoint_instance[i].tx_attributes =
ep_descriptor_ptrs[i - 1]->bmAttributes;
endpoint_instance[i].tx_packetSize =
le16_to_cpu(ep_descriptor_ptrs[i - 1]->wMaxPacketSize);
endpoint_instance[i].tx_packetSize = init_wMaxPacketSize(i);
endpoint_instance[i].tx_attributes =
ep_descriptor_ptrs[i - 1]->bmAttributes;

8
drivers/usb/gadget/epautoconf.c
View File

@ -25,6 +25,7 @@
#include <linux/usb/ch9.h>
#include <asm/errno.h>
#include <linux/usb/gadget.h>
#include <asm/unaligned.h>
#include "gadget_chips.h"
#define isdigit(c) ('0' <= (c) && (c) <= '9')
@ -127,7 +128,7 @@ static int ep_matches(
* where it's an output parameter representing the full speed limit.
* the usb spec fixes high speed bulk maxpacket at 512 bytes.
*/
max = 0x7ff & le16_to_cpu(desc->wMaxPacketSize);
max = 0x7ff & le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
switch (type) {
case USB_ENDPOINT_XFER_INT:
/* INT: limit 64 bytes full speed, 1024 high speed */
@ -143,7 +144,8 @@ static int ep_matches(
return 0;
/* BOTH: "high bandwidth" works only at high speed */
if ((desc->wMaxPacketSize & __constant_cpu_to_le16(3<<11))) {
if ((get_unaligned(&desc->wMaxPacketSize) &
__constant_cpu_to_le16(3<<11))) {
if (!gadget->is_dualspeed)
return 0;
/* configure your hardware with enough buffering!! */
@ -176,7 +178,7 @@ static int ep_matches(
/* min() doesn't work on bitfields with gcc-3.5 */
if (size > 64)
size = 64;
desc->wMaxPacketSize = cpu_to_le16(size);
put_unaligned(cpu_to_le16(size), &desc->wMaxPacketSize);
}
return 1;
}

10
drivers/usb/gadget/s3c_udc_otg.c
View File

@ -40,6 +40,7 @@
#include <linux/usb/gadget.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <asm/io.h>
#include <asm/mach-types.h>
@ -586,7 +587,8 @@ static int s3c_ep_enable(struct usb_ep *_ep,
if (!_ep || !desc || ep->desc || _ep->name == ep0name
|| desc->bDescriptorType != USB_DT_ENDPOINT
|| ep->bEndpointAddress != desc->bEndpointAddress
|| ep_maxpacket(ep) < le16_to_cpu(desc->wMaxPacketSize)) {
|| ep_maxpacket(ep) <
le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
DEBUG("%s: bad ep or descriptor\n", __func__);
return -EINVAL;
@ -603,8 +605,8 @@ static int s3c_ep_enable(struct usb_ep *_ep,
/* hardware _could_ do smaller, but driver doesn't */
if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
&& le16_to_cpu(desc->wMaxPacketSize) != ep_maxpacket(ep))
|| !desc->wMaxPacketSize) {
&& le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) !=
ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {
DEBUG("%s: bad %s maxpacket\n", __func__, _ep->name);
return -ERANGE;
@ -620,7 +622,7 @@ static int s3c_ep_enable(struct usb_ep *_ep,
ep->stopped = 0;
ep->desc = desc;
ep->pio_irqs = 0;
ep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
/* Reset halt state */
s3c_udc_set_nak(ep);

2
include/usbdescriptors.h
View File

@ -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;