> -----Original Message-----
> From: trix@xxxxxxxxxx <trix@xxxxxxxxxx>
> Sent: Sonntag, 2. August 2020 16:24
> To: Hennerich, Michael <Michael.Hennerich@xxxxxxxxxx>;
> alex.aring@xxxxxxxxx; stefan@xxxxxxxxxxxxxxxxxx; davem@xxxxxxxxxxxxx;
> kuba@xxxxxxxxxx; marcel@xxxxxxxxxxxx
> Cc: linux-wpan@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; Tom Rix <trix@xxxxxxxxxx>
> Subject: [PATCH] ieee802154/adf7242: check status of adf7242_read_reg
>
>
> From: Tom Rix <trix@xxxxxxxxxx>
>
> Clang static analysis reports this error
>
> adf7242.c:887:6: warning: Assigned value is garbage or undefined
> len = len_u8;
> ^ ~~~~~~
>
> len_u8 is set in
> adf7242_read_reg(lp, 0, &len_u8);
>
> When this call fails, len_u8 is not set.
>
> So check the return code.
>
> Fixes: 7302b9d90117 ("ieee802154/adf7242: Driver for ADF7242 MAC
> IEEE802154")
>
> Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
Acked-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
> ---
> drivers/net/ieee802154/adf7242.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ieee802154/adf7242.c
> b/drivers/net/ieee802154/adf7242.c
> index c11f32f644db..7db9cbd0f5de 100644
> --- a/drivers/net/ieee802154/adf7242.c
> +++ b/drivers/net/ieee802154/adf7242.c
> @@ -882,7 +882,9 @@ static int adf7242_rx(struct adf7242_local *lp)
> int ret;
> u8 lqi, len_u8, *data;
>
> - adf7242_read_reg(lp, 0, &len_u8);
> + ret = adf7242_read_reg(lp, 0, &len_u8);
> + if (ret)
> + return ret;
>
> len = len_u8;
>
> --
> 2.18.1
