[patch] fix driver_register() return value

[Stas Sergeev <stsp@aknet.ru>]

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Hi Greg.

In this patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=16dc42e018c2868211b4928f20a957c0c216126c
the check was added for another
driver to already claim the same
device on the same bus. But the
returned error code was wrong:
to modprobe, the -EEXIST means
that _this_ driver is already
installed. It therefore doesn't
produce the needed error message
when _another_ driver is trying
to register for the same device.
Returning -EBUSY fixes the problem.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>

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diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index ed2ebd3..f367885 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -236,7 +236,7 @@ int driver_register(struct device_driver *drv)
 		put_driver(other);
 		printk(KERN_ERR "Error: Driver '%s' is already registered, "
 			"aborting...\n", drv->name);
-		return -EEXIST;
+		return -EBUSY;
 	}
 
 	ret = bus_add_driver(drv);