[PATCH] driver core: driver_bind attribute returns incorrect value

[Ryan <hap9@epoch.ncsc.mil>]

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>

---

 drivers/base/bus.c |    5 +++++
 1 files changed, 5 insertions(+)

--- linux-2.6.16-rc5/drivers/base/bus.c	2006-03-16 10:50:20.000000000 -0500
+++ linux-2.6.16-rc5/drivers/base/bus.c	2006-03-16 11:02:08.000000000 -0500
@@ -188,6 +188,11 @@ static ssize_t driver_bind(struct device
 		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);


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