Re: [PATCH RESEND] nvmem: Fix return value check in rmem_read()

[Srinivas Kandagatla]

On 02/11/2022 03:25, Yang Yingliang wrote:
> From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
>
> In case of error, the function memremap() returns NULL pointer
> not ERR_PTR(). The IS_ERR() test in the return value check
> should be replaced with NULL test.
>
> Fixes: 5a3fa75a4d9c ("nvmem: Add driver to expose reserved memory as nvmem")
> Cc: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
> Cc: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
> Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
> Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
> Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
> ---
> The previous patch link:
> https://lore.kernel.org/all/2fff7c82d983baccb91c4a1c0891a9b6cdc50dd6.camel@xxxxxxx/T/
> ---

Applied thanks,

--srini
>   drivers/nvmem/rmem.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/nvmem/rmem.c b/drivers/nvmem/rmem.c
> index b11c3c974b3d..80cb187f1481 100644
> --- a/drivers/nvmem/rmem.c
> +++ b/drivers/nvmem/rmem.c
> @@ -37,9 +37,9 @@ static int rmem_read(void *context, unsigned int offset,
>   	 * but as of Dec 2020 this isn't possible on arm64.
>   	 */
>   	addr = memremap(priv->mem->base, available, MEMREMAP_WB);
> -	if (IS_ERR(addr)) {
> +	if (!addr) {
>   		dev_err(priv->dev, "Failed to remap memory region\n");
> -		return PTR_ERR(addr);
> +		return -ENOMEM;
>   	}
>   
>   	count = memory_read_from_buffer(val, bytes, &off, addr, available);