linux-kernel - patch driver-core-fix-driver_register-return-value.patch added to gregkh-2.6 tree

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Date:	Mon, 26 Oct 2009 16:56:58 -0700
From:	<gregkh@...e.de>
To:	stsp@...et.ru, gregkh@...e.de, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: patch driver-core-fix-driver_register-return-value.patch added to gregkh-2.6 tree


This is a note to let you know that I've just added the patch titled

    Subject: Driver core: fix driver_register() return value

to my gregkh-2.6 tree.  Its filename is

    driver-core-fix-driver_register-return-value.patch

This tree can be found at 
    http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/


>From stsp@...et.ru  Mon Oct 26 16:00:03 2009
From: Stas Sergeev <stsp@...et.ru>
Date: Sun, 18 Oct 2009 00:31:38 +0400
Subject: Driver core: fix driver_register() return value
To: Greg KH <gregkh@...e.de>
Cc: Linux kernel <linux-kernel@...r.kernel.org>
Message-ID: <4ADA29AA.9070907@...et.ru>

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@...et.ru>
Cc: stable <stable@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/base/driver.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -236,7 +236,7 @@ int driver_register(struct device_driver
 		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);

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