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Subject[PATCH 5/7] driver core: driver_bind attribute returns incorrect value
Date
From
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>

---

drivers/base/bus.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

372254018eb1b65ee69210d11686bfc65c8d84db
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 48718b7..76656ac 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -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);
--
1.2.6

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