From: Alan Stern <[EMAIL PROTECTED]>
This patch (as915b) combines the public routine usb_port_suspend() and
the private routine __usb_port_suspend() into a single function.
By removing the explicit mention of otg_port in the call to
__usb_port_suspend(), we prevent a possible error in which the system
tries to perform HNP on the wrong port when a non-targeted device is
plugged into a non-OTG port.
Signed-off-by: Alan Stern <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
drivers/usb/core/hub.c | 57 +++++++++++++++++++----------------------------
drivers/usb/core/usb.h | 12 ++++++++-
2 files changed, 33 insertions(+), 36 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 7946d7b..04d6fde 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1333,7 +1333,6 @@ static inline void show_string(struct usb_device *udev,
char *id, char *string)
#ifdef CONFIG_USB_OTG
#include "otg_whitelist.h"
-static int __usb_port_suspend(struct usb_device *, int port1);
#endif
/**
@@ -1439,7 +1438,7 @@ int usb_new_device(struct usb_device *udev)
* (Includes HNP test device.)
*/
if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
- err = __usb_port_suspend(udev, udev->bus->otg_port);
+ err = usb_port_suspend(udev);
if (err < 0)
dev_dbg(&udev->dev, "HNP fail, %d\n", err);
}
@@ -1683,6 +1682,23 @@ static int hub_port_suspend(struct usb_hub *hub, int
port1,
}
/*
+ * usb_port_suspend - suspend a usb device's upstream port
+ * @udev: device that's no longer in active use
+ * Context: must be able to sleep; device not locked; pm locks held
+ *
+ * Suspends a USB device that isn't in active use, conserving power.
+ * Devices may wake out of a suspend, if anything important happens,
+ * using the remote wakeup mechanism. They may also be taken out of
+ * suspend by the host, using usb_port_resume(). It's also routine
+ * to disconnect devices while they are suspended.
+ *
+ * This only affects the USB hardware for a device; its interfaces
+ * (and, for hubs, child devices) must already have been suspended.
+ *
+ * Suspending OTG devices may trigger HNP, if that's been enabled
+ * between a pair of dual-role devices. That will change roles, such
+ * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
+ *
* Devices on USB hub ports have only one "suspend" state, corresponding
* to ACPI D2, "may cause the device to lose some context".
* State transitions include:
@@ -1699,21 +1715,19 @@ static int hub_port_suspend(struct usb_hub *hub, int
port1,
* If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
* the root hub for their bus goes into global suspend ... so we don't
* (falsely) update the device power state to say it suspended.
+ *
+ * Returns 0 on success, else negative errno.
*/
-static int __usb_port_suspend (struct usb_device *udev, int port1)
+int usb_port_suspend(struct usb_device *udev)
{
int status = 0;
- /* caller owns the udev device lock */
- if (port1 < 0)
- return port1;
-
/* we change the device's upstream USB link,
* but root hubs have no upstream USB link.
*/
if (udev->parent)
- status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
- udev);
+ status = hub_port_suspend(hdev_to_hub(udev->parent),
+ udev->portnum, udev);
else {
dev_dbg(&udev->dev, "usb %ssuspend\n",
udev->auto_pm ? "auto-" : "");
@@ -1723,31 +1737,6 @@ static int __usb_port_suspend (struct usb_device *udev,
int port1)
}
/*
- * usb_port_suspend - suspend a usb device's upstream port
- * @udev: device that's no longer in active use
- * Context: must be able to sleep; device not locked; pm locks held
- *
- * Suspends a USB device that isn't in active use, conserving power.
- * Devices may wake out of a suspend, if anything important happens,
- * using the remote wakeup mechanism. They may also be taken out of
- * suspend by the host, using usb_port_resume(). It's also routine
- * to disconnect devices while they are suspended.
- *
- * This only affects the USB hardware for a device; its interfaces
- * (and, for hubs, child devices) must already have been suspended.
- *
- * Suspending OTG devices may trigger HNP, if that's been enabled
- * between a pair of dual-role devices. That will change roles, such
- * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
- *
- * Returns 0 on success, else negative errno.
- */
-int usb_port_suspend(struct usb_device *udev)
-{
- return __usb_port_suspend(udev, udev->portnum);
-}
-
-/*
* If the USB "suspend" state is in use (rather than "global suspend"),
* many devices will be individually taken out of suspend state using
* special" resume" signaling. These routines kick in shortly after
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 1a48628..a547499 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -53,8 +53,16 @@ static inline void usb_pm_unlock(struct usb_device *udev)
#else
-#define usb_port_suspend(dev) 0
-#define usb_port_resume(dev) 0
+static inline int usb_port_suspend(struct usb_device *udev)
+{
+ return 0;
+}
+
+static inline int usb_port_resume(struct usb_device *udev)
+{
+ return 0;
+}
+
static inline void usb_pm_lock(struct usb_device *udev) {}
static inline void usb_pm_unlock(struct usb_device *udev) {}
--
1.5.2.2
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