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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2010-01-06 10:16:51 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-01-20 15:24:35 -0800
commit04a723ea9c53ba608b0411aa36948bb57c51a08e (patch)
tree1a5d7395ccc864b8bdf8688396688951e28a4ca8
parentb132b04e193908a94d95065d0628f8fb0159cc55 (diff)
downloadlinux-04a723ea9c53ba608b0411aa36948bb57c51a08e.tar.gz
USB: Fix duplicate sysfs problem after device reset.
Borislav Petkov reports issues with duplicate sysfs endpoint files after a resume from a hibernate. It turns out that the code to support alternate settings under xHCI has issues when a device with a non-default alternate setting is reset during the hibernate: [ 427.681810] Restarting tasks ... [ 427.681995] hub 1-0:1.0: state 7 ports 6 chg 0004 evt 0000 [ 427.682019] usb usb3: usb resume [ 427.682030] ohci_hcd 0000:00:12.0: wakeup root hub [ 427.682191] hub 1-0:1.0: port 2, status 0501, change 0000, 480 Mb/s [ 427.682205] usb 1-2: usb wakeup-resume [ 427.682226] usb 1-2: finish reset-resume [ 427.682886] done. [ 427.734658] ehci_hcd 0000:00:12.2: port 2 high speed [ 427.734663] ehci_hcd 0000:00:12.2: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT [ 427.746682] hub 3-0:1.0: hub_reset_resume [ 427.746693] hub 3-0:1.0: trying to enable port power on non-switchable hub [ 427.786715] usb 1-2: reset high speed USB device using ehci_hcd and address 2 [ 427.839653] ehci_hcd 0000:00:12.2: port 2 high speed [ 427.839666] ehci_hcd 0000:00:12.2: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT [ 427.847717] ohci_hcd 0000:00:12.0: GetStatus roothub.portstatus [1] = 0x00010100 CSC PPS [ 427.915497] hub 1-2:1.0: remove_intf_ep_devs: if: ffff88022f9e8800 ->ep_devs_created: 1 [ 427.915774] hub 1-2:1.0: remove_intf_ep_devs: bNumEndpoints: 1 [ 427.915934] hub 1-2:1.0: if: ffff88022f9e8800: endpoint devs removed. [ 427.916158] hub 1-2:1.0: create_intf_ep_devs: if: ffff88022f9e8800 ->ep_devs_created: 0, ->unregistering: 0 [ 427.916434] hub 1-2:1.0: create_intf_ep_devs: bNumEndpoints: 1 [ 427.916609] ep_81: create, parent hub [ 427.916632] ------------[ cut here ]------------ [ 427.916644] WARNING: at fs/sysfs/dir.c:477 sysfs_add_one+0x82/0x96() [ 427.916649] Hardware name: System Product Name [ 427.916653] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:12.2/usb1/1-2/1-2:1.0/ep_81' [ 427.916658] Modules linked in: binfmt_misc kvm_amd kvm powernow_k8 cpufreq_ondemand cpufreq_powersave cpufreq_userspace freq_table cpufreq_conservative ipv6 vfat fat +8250_pnp 8250 pcspkr ohci_hcd serial_core k10temp edac_core [ 427.916694] Pid: 278, comm: khubd Not tainted 2.6.33-rc2-00187-g08d869a-dirty #13 [ 427.916699] Call Trace: The problem is caused by a mismatch between the USB core's view of the device state and the USB device and xHCI host's view of the device state. After the device reset and re-configuration, the device and the xHCI host think they are using alternate setting 0 of all interfaces. However, the USB core keeps track of the old state, which may include non-zero alternate settings. It uses intf->cur_altsetting to keep the endpoint sysfs files for the old state across the reset. The bandwidth allocation functions need to know what the xHCI host thinks the current alternate settings are, so original patch set intf->cur_altsetting to the alternate setting 0. This caused duplicate endpoint files to be created. The solution is to not set intf->cur_altsetting before calling usb_set_interface() in usb_reset_and_verify_device(). Instead, we add a new flag to struct usb_interface to tell usb_hcd_alloc_bandwidth() to use alternate setting 0 as the currently installed alternate setting. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Tested-by: Borislav Petkov <petkovbb@googlemail.com> Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/core/hcd.c18
-rw-r--r--drivers/usb/core/hub.c15
-rw-r--r--include/linux/usb.h1
3 files changed, 24 insertions, 10 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 0495fa65122..80995ef0868 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1684,6 +1684,24 @@ int usb_hcd_alloc_bandwidth(struct usb_device *udev,
}
}
if (cur_alt && new_alt) {
+ struct usb_interface *iface = usb_ifnum_to_if(udev,
+ cur_alt->desc.bInterfaceNumber);
+
+ if (iface->resetting_device) {
+ /*
+ * The USB core just reset the device, so the xHCI host
+ * and the device will think alt setting 0 is installed.
+ * However, the USB core will pass in the alternate
+ * setting installed before the reset as cur_alt. Dig
+ * out the alternate setting 0 structure, or the first
+ * alternate setting if a broken device doesn't have alt
+ * setting 0.
+ */
+ cur_alt = usb_altnum_to_altsetting(iface, 0);
+ if (!cur_alt)
+ cur_alt = &iface->altsetting[0];
+ }
+
/* Drop all the endpoints in the current alt setting */
for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
ret = hcd->driver->drop_endpoint(hcd, udev,
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index b9f5fcd713e..35cc8b9ba1f 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3695,19 +3695,14 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
usb_enable_interface(udev, intf, true);
ret = 0;
} else {
- /* We've just reset the device, so it will think alt
- * setting 0 is installed. For usb_set_interface() to
- * work properly, we need to set the current alternate
- * interface setting to 0 (or the first alt setting, if
- * the device doesn't have alt setting 0).
+ /* Let the bandwidth allocation function know that this
+ * device has been reset, and it will have to use
+ * alternate setting 0 as the current alternate setting.
*/
- intf->cur_altsetting =
- usb_find_alt_setting(config, i, 0);
- if (!intf->cur_altsetting)
- intf->cur_altsetting =
- &config->intf_cache[i]->altsetting[0];
+ intf->resetting_device = 1;
ret = usb_set_interface(udev, desc->bInterfaceNumber,
desc->bAlternateSetting);
+ intf->resetting_device = 0;
}
if (ret < 0) {
dev_err(&udev->dev, "failed to restore interface %d "
diff --git a/include/linux/usb.h b/include/linux/usb.h
index e101a2d04d7..d7ace1b80f0 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -192,6 +192,7 @@ struct usb_interface {
unsigned needs_altsetting0:1; /* switch to altsetting 0 is pending */
unsigned needs_binding:1; /* needs delayed unbind/rebind */
unsigned reset_running:1;
+ unsigned resetting_device:1; /* true: bandwidth alloc after reset */
struct device dev; /* interface specific device info */
struct device *usb_dev;