[PATCH] nvmem: core: fix return value

[Russell King (Oracle)]

On Tue, Jan 10, 2023 at 04:50:05PM +0000, Srinivas Kandagatla wrote:
> Hi Russell,
> 
> On 10/01/2023 16:48, Russell King (Oracle) wrote:
> > Dan Carpenter points out that the return code was not set in commit
> > 60c8b4aebd8e ("nvmem: core: fix cleanup after dev_set_name()"), but
> > this is not the only issue - we also need to zero wp_gpio to prevent
> > gpiod_put() being called on an error value.
> > 
> > Reported-by: kernel test robot <lkp at intel.com>
> > Reported-by: Dan Carpenter <error27 at gmail.com>
> > Fixes: 60c8b4aebd8e ("nvmem: core: fix cleanup after dev_set_name()")
> > Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
> > ---
> >   drivers/nvmem/core.c | 5 ++++-
> >   1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> > index 082cda7ac199..1ee2e9255f7b 100644
> > --- a/drivers/nvmem/core.c
> > +++ b/drivers/nvmem/core.c
> > @@ -781,8 +781,11 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
> >   	if (!config->ignore_wp)
> >   		nvmem->wp_gpio = gpiod_get_optional(config->dev, "wp",
> >   						    GPIOD_OUT_HIGH);
> > -	if (IS_ERR(nvmem->wp_gpio))
> > +	if (IS_ERR(nvmem->wp_gpio)) {
> > +		rval = PTR_ERR(nvmem->wp_gpio);
> > +		nvmem->wp_gpio = NULL;
> >   		goto err_put_device;
> 
> I have already added this change while applying v3 patches.

You still need wp_gpio to be NULL'd out, otherwise we'll end up calling
gpiod_put() on the error-pointer.

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