This is a note to let you know that I've just added the patch titled
Subject: USB: fix toggle mismatch in disable_endpoint paths
to my gregkh-2.6 tree. Its filename is
usb-fix-toggle-mismatch-in-disable_endpoint-paths.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From stern@xxxxxxxxxxxxxxxxxxx Sat Jan 24 16:15:49 2009
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 15 Jan 2009 17:03:33 -0500 (EST)
Subject: USB: fix toggle mismatch in disable_endpoint paths
To: Greg KH <greg@xxxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>, USB list <linux-usb@xxxxxxxxxxxxxxx>
Message-ID: <Pine.LNX.4.44L0.0901151700570.2181-100000@xxxxxxxxxxxxxxxxxxxx>
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
This patch (as1200) finishes some fixes that were left incomplete by
an earlier patch.
Although nobody has addressed this issue in the past, it turns out
that we need to distinguish between two different modes of disabling
and enabling endpoints. In one mode only the data structures in
usbcore are affected, and in the other mode the host controller and
device hardware states are affected as well.
The earlier patch added an extra argument to the routines in the
enable_endpoint pathways to reflect this difference. This patch adds
corresponding arguments to the disable_endpoint pathways. Without
this change, the endpoint toggle state can get out of sync between
the host and the device. The exact mechanism depends on the details
of the host controller (whether or not it stores its own copy of the
toggle values).
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Reported-by: Dan Streetman <ddstreet@xxxxxxxx>
Tested-by: Dan Streetman <ddstreet@xxxxxxxx>
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/core/driver.c | 2 +-
drivers/usb/core/hub.c | 4 ++--
drivers/usb/core/message.c | 40 ++++++++++++++++++++++++----------------
drivers/usb/core/usb.h | 5 +++--
4 files changed, 30 insertions(+), 21 deletions(-)
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -284,7 +284,7 @@ static int usb_unbind_interface(struct d
* supports "soft" unbinding.
*/
if (!driver->soft_unbind)
- usb_disable_interface(udev, intf);
+ usb_disable_interface(udev, intf, false);
driver->disconnect(intf);
usb_cancel_queued_reset(intf);
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2382,8 +2382,8 @@ static int hub_port_debounce(struct usb_
void usb_ep0_reinit(struct usb_device *udev)
{
- usb_disable_endpoint(udev, 0 + USB_DIR_IN);
- usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
+ usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
+ usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
usb_enable_endpoint(udev, &udev->ep0, true);
}
EXPORT_SYMBOL_GPL(usb_ep0_reinit);
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1039,14 +1039,15 @@ static void remove_intf_ep_devs(struct u
* @dev: the device whose endpoint is being disabled
* @epaddr: the endpoint's address. Endpoint number for output,
* endpoint number + USB_DIR_IN for input
+ * @reset_hardware: flag to erase any endpoint state stored in the
+ * controller hardware
*
- * Deallocates hcd/hardware state for this endpoint ... and nukes all
- * pending urbs.
- *
- * If the HCD hasn't registered a disable() function, this sets the
- * endpoint's maxpacket size to 0 to prevent further submissions.
+ * Disables the endpoint for URB submission and nukes all pending URBs.
+ * If @reset_hardware is set then also deallocates hcd/hardware state
+ * for the endpoint.
*/
-void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr)
+void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr,
+ bool reset_hardware)
{
unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK;
struct usb_host_endpoint *ep;
@@ -1056,15 +1057,18 @@ void usb_disable_endpoint(struct usb_dev
if (usb_endpoint_out(epaddr)) {
ep = dev->ep_out[epnum];
- dev->ep_out[epnum] = NULL;
+ if (reset_hardware)
+ dev->ep_out[epnum] = NULL;
} else {
ep = dev->ep_in[epnum];
- dev->ep_in[epnum] = NULL;
+ if (reset_hardware)
+ dev->ep_in[epnum] = NULL;
}
if (ep) {
ep->enabled = 0;
usb_hcd_flush_endpoint(dev, ep);
- usb_hcd_disable_endpoint(dev, ep);
+ if (reset_hardware)
+ usb_hcd_disable_endpoint(dev, ep);
}
}
@@ -1072,17 +1076,21 @@ void usb_disable_endpoint(struct usb_dev
* usb_disable_interface -- Disable all endpoints for an interface
* @dev: the device whose interface is being disabled
* @intf: pointer to the interface descriptor
+ * @reset_hardware: flag to erase any endpoint state stored in the
+ * controller hardware
*
* Disables all the endpoints for the interface's current altsetting.
*/
-void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf)
+void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf,
+ bool reset_hardware)
{
struct usb_host_interface *alt = intf->cur_altsetting;
int i;
for (i = 0; i < alt->desc.bNumEndpoints; ++i) {
usb_disable_endpoint(dev,
- alt->endpoint[i].desc.bEndpointAddress);
+ alt->endpoint[i].desc.bEndpointAddress,
+ reset_hardware);
}
}
@@ -1103,8 +1111,8 @@ void usb_disable_device(struct usb_devic
dev_dbg(&dev->dev, "%s nuking %s URBs\n", __func__,
skip_ep0 ? "non-ep0" : "all");
for (i = skip_ep0; i < 16; ++i) {
- usb_disable_endpoint(dev, i);
- usb_disable_endpoint(dev, i + USB_DIR_IN);
+ usb_disable_endpoint(dev, i, true);
+ usb_disable_endpoint(dev, i + USB_DIR_IN, true);
}
dev->toggle[0] = dev->toggle[1] = 0;
@@ -1274,7 +1282,7 @@ int usb_set_interface(struct usb_device
remove_intf_ep_devs(iface);
usb_remove_sysfs_intf_files(iface);
}
- usb_disable_interface(dev, iface);
+ usb_disable_interface(dev, iface, true);
iface->cur_altsetting = alt;
@@ -1353,8 +1361,8 @@ int usb_reset_configuration(struct usb_d
*/
for (i = 1; i < 16; ++i) {
- usb_disable_endpoint(dev, i);
- usb_disable_endpoint(dev, i + USB_DIR_IN);
+ usb_disable_endpoint(dev, i, true);
+ usb_disable_endpoint(dev, i + USB_DIR_IN, true);
}
config = dev->actconfig;
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -15,9 +15,10 @@ extern void usb_enable_endpoint(struct u
struct usb_host_endpoint *ep, bool reset_toggle);
extern void usb_enable_interface(struct usb_device *dev,
struct usb_interface *intf, bool reset_toggles);
-extern void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr);
+extern void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr,
+ bool reset_hardware);
extern void usb_disable_interface(struct usb_device *dev,
- struct usb_interface *intf);
+ struct usb_interface *intf, bool reset_hardware);
extern void usb_release_interface_cache(struct kref *ref);
extern void usb_disable_device(struct usb_device *dev, int skip_ep0);
extern int usb_deauthorize_device(struct usb_device *);
Patches currently in gregkh-2.6 which might be from stern@xxxxxxxxxxxxxxxxxxx are
usb.current/usb-don-t-enable-wakeup-by-default-for-pci-host-controllers.patch
usb.current/usb-fix-char-device-disconnect-handling.patch
usb.current/usb-fix-suspend-resume-of-pci-usb-controllers.patch
usb.current/usb-fix-toggle-mismatch-in-disable_endpoint-paths.patch
driver-core.current/klist.c-bit-0-in-pointer-can-t-be-used-as-flag.patch
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
