This patch (as906) improves the error handling for the USB power/level
attribute file. If an error occurs, the original power-level settings
will be restored.
Signed-off-by: Alan Stern <[EMAIL PROTECTED]>
---
Index: usb-2.6/drivers/usb/core/sysfs.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/sysfs.c
+++ usb-2.6/drivers/usb/core/sysfs.c
@@ -232,12 +232,15 @@ set_level(struct device *dev, struct dev
int len = count;
char *cp;
int rc = 0;
+ int old_autosuspend_disabled, old_autoresume_disabled;
cp = memchr(buf, '\n', count);
if (cp)
len = cp - buf;
usb_lock_device(udev);
+ old_autosuspend_disabled = udev->autosuspend_disabled;
+ old_autoresume_disabled = udev->autoresume_disabled;
/* Setting the flags without calling usb_pm_lock is a subject to
* races, but who cares...
@@ -263,6 +266,10 @@ set_level(struct device *dev, struct dev
} else
rc = -EINVAL;
+ if (rc) {
+ udev->autosuspend_disabled = old_autosuspend_disabled;
+ udev->autoresume_disabled = old_autoresume_disabled;
+ }
usb_unlock_device(udev);
return (rc < 0 ? rc : count);
}
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