This code is really spurious.
It always returns an ERR_PTR, even when err is known to be 0 and calls
put_device() after a successful device_register() call.

It is likely that the return statement in the normal path is missing.
Add 'return rdev;' to fix it.

Fixes: d787dcdb9c8f ("bus: sunxi-rsb: Add driver for Allwinner Reduced Serial Bus")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
This patch is completely speculative and compile tested only.
---
 drivers/bus/sunxi-rsb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c
index 4566e730ef2b..60b082fe2ed0 100644
--- a/drivers/bus/sunxi-rsb.c
+++ b/drivers/bus/sunxi-rsb.c
@@ -227,6 +227,8 @@ static struct sunxi_rsb_device *sunxi_rsb_device_create(struct sunxi_rsb *rsb,
 
 	dev_dbg(&rdev->dev, "device %s registered\n", dev_name(&rdev->dev));
 
+	return rdev;
+
 err_device_add:
 	put_device(&rdev->dev);
 
-- 
2.32.0

On 4/21/22 9:35 AM, Christophe JAILLET wrote:
> This code is really spurious.
> It always returns an ERR_PTR, even when err is known to be 0 and calls
> put_device() after a successful device_register() call.
> 
> It is likely that the return statement in the normal path is missing.
> Add 'return rdev;' to fix it.

Thanks for the patch. This definitely looks to be the case.

> Fixes: d787dcdb9c8f ("bus: sunxi-rsb: Add driver for Allwinner Reduced Serial Bus")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

Reviewed-by: Samuel Holland <samuel@sholland.org>
Tested-by: Samuel Holland <samuel@sholland.org>

Dne sobota, 23. april 2022 ob 21:39:45 CEST je Samuel Holland napisal(a):
> On 4/21/22 9:35 AM, Christophe JAILLET wrote:
> > This code is really spurious.
> > It always returns an ERR_PTR, even when err is known to be 0 and calls
> > put_device() after a successful device_register() call.
> > 
> > It is likely that the return statement in the normal path is missing.
> > Add 'return rdev;' to fix it.
> 
> Thanks for the patch. This definitely looks to be the case.
> 
> > Fixes: d787dcdb9c8f ("bus: sunxi-rsb: Add driver for Allwinner Reduced 
Serial Bus")
> > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> 
> Reviewed-by: Samuel Holland <samuel@sholland.org>
> Tested-by: Samuel Holland <samuel@sholland.org>
> 

Applied to sunxi/fixes-for-5.18, thanks!

Best regards,
Jernej