diff options
| author | Ryan Wilson <hap9@epoch.ncsc.mil> | 2006-03-22 16:26:25 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-04-14 11:41:25 -0700 |
| commit | 372254018eb1b65ee69210d11686bfc65c8d84db (patch) | |
| tree | d231099272446513886eeab80e94b8fb84881ed9 /drivers/base | |
| parent | a14388904ca67197c9a531dba2358d8131697865 (diff) | |
[PATCH] driver core: driver_bind attribute returns incorrect value
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>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/bus.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 48718b7f4fa..76656acd00d 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -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); |