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USB: handle errors in power/level attribute

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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 <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-05-22 11:38:19 -04:00 committed by Greg Kroah-Hartman
parent 7ed92f1a14
commit dd865571d7
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/core/sysfs.c
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@ -232,12 +232,15 @@ set_level(struct device *dev, struct device_attribute *attr,
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 device_attribute *attr,
} 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);
}