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[PATCH] driver core: driver_bind attribute returns incorrect value

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The manual driver <-> device binding attribute in sysfs doesn't return
the correct value on failure or success of driver_probe_device.
driver_probe_device returns 1 on success (the driver accepted the
device) or 0 on probe failure (when the driver didn't accept the
device but no real error occured). However, the attribute can't just
return 0 or 1, it must return the number of bytes consumed from buf
or an error value. Returning 0 indicates to userspace that nothing
was written (even though the kernel has tried to do the bind/probe and
failed). Returning 1 indicates that only one character was accepted in
which case userspace will re-try the write with a partial string.

A more correct version of driver_bind would return count (to indicate
the entire string was consumed) when driver_probe_device returns 1
and -ENODEV when driver_probe_device returns 0. This patch makes that
change.

Signed-off-by: Ryan Wilson <hap9@epoch.ncsc.mil>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ryan Wilson 2006-03-22 16:26:25 -05:00 committed by Greg Kroah-Hartman
parent a14388904c
commit 372254018e
1 changed files with 5 additions and 0 deletions
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5
drivers/base/bus.c
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@ -188,6 +188,11 @@ static ssize_t driver_bind(struct device_driver *drv,
up(&dev->sem);
if (dev->parent)
up(&dev->parent->sem);
if (err > 0) /* success */
err = count;
else if (err == 0) /* driver didn't accept device */
err = -ENODEV;
}
put_device(dev);
put_bus(bus);