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207 lines
6.2 KiB
Diff
207 lines
6.2 KiB
Diff
commit 032f44791457d9aa50c6a194a2d475f07e311afd
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Author: Felix Fietkau <nbd@openwrt.org>
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Date: Wed Jul 9 12:08:23 2014 +0200
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Revert "USB: unbind all interfaces before rebinding any"
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This reverts commit 59f0103d74e4a32cbaa054d5011ea287fcfb83e4.
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The commit has been found to cause USB regressions on AR933x and
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BCM4705.
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--- a/drivers/usb/core/driver.c
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+++ b/drivers/usb/core/driver.c
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@@ -953,7 +953,8 @@ EXPORT_SYMBOL_GPL(usb_deregister);
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* it doesn't support pre_reset/post_reset/reset_resume or
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* because it doesn't support suspend/resume.
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*
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- * The caller must hold @intf's device's lock, but not @intf's lock.
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+ * The caller must hold @intf's device's lock, but not its pm_mutex
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+ * and not @intf->dev.sem.
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*/
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void usb_forced_unbind_intf(struct usb_interface *intf)
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{
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@@ -966,37 +967,16 @@ void usb_forced_unbind_intf(struct usb_i
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intf->needs_binding = 1;
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}
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-/*
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- * Unbind drivers for @udev's marked interfaces. These interfaces have
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- * the needs_binding flag set, for example by usb_resume_interface().
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- *
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- * The caller must hold @udev's device lock.
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- */
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-static void unbind_marked_interfaces(struct usb_device *udev)
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-{
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- struct usb_host_config *config;
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- int i;
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- struct usb_interface *intf;
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-
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- config = udev->actconfig;
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- if (config) {
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- for (i = 0; i < config->desc.bNumInterfaces; ++i) {
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- intf = config->interface[i];
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- if (intf->dev.driver && intf->needs_binding)
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- usb_forced_unbind_intf(intf);
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- }
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- }
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-}
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-
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/* Delayed forced unbinding of a USB interface driver and scan
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* for rebinding.
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*
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- * The caller must hold @intf's device's lock, but not @intf's lock.
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+ * The caller must hold @intf's device's lock, but not its pm_mutex
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+ * and not @intf->dev.sem.
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*
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* Note: Rebinds will be skipped if a system sleep transition is in
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* progress and the PM "complete" callback hasn't occurred yet.
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*/
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-static void usb_rebind_intf(struct usb_interface *intf)
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+void usb_rebind_intf(struct usb_interface *intf)
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{
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int rc;
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@@ -1013,66 +993,68 @@ static void usb_rebind_intf(struct usb_i
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}
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}
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-/*
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- * Rebind drivers to @udev's marked interfaces. These interfaces have
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- * the needs_binding flag set.
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+#ifdef CONFIG_PM
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+
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+/* Unbind drivers for @udev's interfaces that don't support suspend/resume
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+ * There is no check for reset_resume here because it can be determined
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+ * only during resume whether reset_resume is needed.
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*
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* The caller must hold @udev's device lock.
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*/
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-static void rebind_marked_interfaces(struct usb_device *udev)
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+static void unbind_no_pm_drivers_interfaces(struct usb_device *udev)
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{
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struct usb_host_config *config;
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int i;
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struct usb_interface *intf;
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+ struct usb_driver *drv;
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config = udev->actconfig;
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if (config) {
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for (i = 0; i < config->desc.bNumInterfaces; ++i) {
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intf = config->interface[i];
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- if (intf->needs_binding)
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- usb_rebind_intf(intf);
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+
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+ if (intf->dev.driver) {
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+ drv = to_usb_driver(intf->dev.driver);
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+ if (!drv->suspend || !drv->resume)
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+ usb_forced_unbind_intf(intf);
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+ }
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}
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}
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}
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-/*
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- * Unbind all of @udev's marked interfaces and then rebind all of them.
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- * This ordering is necessary because some drivers claim several interfaces
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- * when they are first probed.
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+/* Unbind drivers for @udev's interfaces that failed to support reset-resume.
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+ * These interfaces have the needs_binding flag set by usb_resume_interface().
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*
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* The caller must hold @udev's device lock.
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*/
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-void usb_unbind_and_rebind_marked_interfaces(struct usb_device *udev)
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+static void unbind_no_reset_resume_drivers_interfaces(struct usb_device *udev)
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{
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- unbind_marked_interfaces(udev);
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- rebind_marked_interfaces(udev);
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-}
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+ struct usb_host_config *config;
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+ int i;
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+ struct usb_interface *intf;
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-#ifdef CONFIG_PM
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+ config = udev->actconfig;
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+ if (config) {
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+ for (i = 0; i < config->desc.bNumInterfaces; ++i) {
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+ intf = config->interface[i];
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+ if (intf->dev.driver && intf->needs_binding)
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+ usb_forced_unbind_intf(intf);
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+ }
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+ }
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+}
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-/* Unbind drivers for @udev's interfaces that don't support suspend/resume
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- * There is no check for reset_resume here because it can be determined
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- * only during resume whether reset_resume is needed.
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- *
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- * The caller must hold @udev's device lock.
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- */
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-static void unbind_no_pm_drivers_interfaces(struct usb_device *udev)
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+static void do_rebind_interfaces(struct usb_device *udev)
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{
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struct usb_host_config *config;
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int i;
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struct usb_interface *intf;
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- struct usb_driver *drv;
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config = udev->actconfig;
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if (config) {
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for (i = 0; i < config->desc.bNumInterfaces; ++i) {
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intf = config->interface[i];
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-
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- if (intf->dev.driver) {
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- drv = to_usb_driver(intf->dev.driver);
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- if (!drv->suspend || !drv->resume)
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- usb_forced_unbind_intf(intf);
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- }
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+ if (intf->needs_binding)
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+ usb_rebind_intf(intf);
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}
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}
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}
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@@ -1397,7 +1379,7 @@ int usb_resume_complete(struct device *d
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* whose needs_binding flag is set
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*/
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if (udev->state != USB_STATE_NOTATTACHED)
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- rebind_marked_interfaces(udev);
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+ do_rebind_interfaces(udev);
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return 0;
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}
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@@ -1419,7 +1401,7 @@ int usb_resume(struct device *dev, pm_me
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pm_runtime_disable(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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- unbind_marked_interfaces(udev);
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+ unbind_no_reset_resume_drivers_interfaces(udev);
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}
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/* Avoid PM error messages for devices disconnected while suspended
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--- a/drivers/usb/core/hub.c
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+++ b/drivers/usb/core/hub.c
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@@ -5334,11 +5334,10 @@ int usb_reset_device(struct usb_device *
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else if (cintf->condition ==
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USB_INTERFACE_BOUND)
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rebind = 1;
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- if (rebind)
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- cintf->needs_binding = 1;
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}
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+ if (ret == 0 && rebind)
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+ usb_rebind_intf(cintf);
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}
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- usb_unbind_and_rebind_marked_interfaces(udev);
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}
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usb_autosuspend_device(udev);
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--- a/drivers/usb/core/usb.h
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+++ b/drivers/usb/core/usb.h
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@@ -55,7 +55,7 @@ extern int usb_match_one_id_intf(struct
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extern int usb_match_device(struct usb_device *dev,
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const struct usb_device_id *id);
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extern void usb_forced_unbind_intf(struct usb_interface *intf);
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-extern void usb_unbind_and_rebind_marked_interfaces(struct usb_device *udev);
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+extern void usb_rebind_intf(struct usb_interface *intf);
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extern int usb_hub_claim_port(struct usb_device *hdev, unsigned port,
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struct dev_state *owner);
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