USB: handle errors in power/level attribute
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>
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@ -232,12 +232,15 @@ set_level(struct device *dev, struct device_attribute *attr,
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int len = count;
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char *cp;
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int rc = 0;
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int old_autosuspend_disabled, old_autoresume_disabled;
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cp = memchr(buf, '\n', count);
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if (cp)
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len = cp - buf;
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usb_lock_device(udev);
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old_autosuspend_disabled = udev->autosuspend_disabled;
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old_autoresume_disabled = udev->autoresume_disabled;
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/* Setting the flags without calling usb_pm_lock is a subject to
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* races, but who cares...
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@ -263,6 +266,10 @@ set_level(struct device *dev, struct device_attribute *attr,
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} else
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rc = -EINVAL;
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if (rc) {
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udev->autosuspend_disabled = old_autosuspend_disabled;
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udev->autoresume_disabled = old_autoresume_disabled;
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}
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usb_unlock_device(udev);
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return (rc < 0 ? rc : count);
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}
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