Re: [PATCH] drivers: net: wireless: ath: ath9: dfs: remove VLA usage

Himanshu Jha
2018-03-09T12:51:24Z

On Fri, Mar 09, 2018 at 02:30:12PM +0200, Andreas Christoforou wrote:
> The kernel would like to have all stack VLA usage removed.
>
> Signed-off-by: Andreas Christoforou <andreaschristofo@gmail.com>
> ---
> drivers/net/wireless/ath/ath9k/dfs.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath9k/dfs.c b/drivers/net/wireless/ath/ath9k/dfs.c
> index 6fee9a4..cfb0f84 100644
> --- a/drivers/net/wireless/ath/ath9k/dfs.c
> +++ b/drivers/net/wireless/ath/ath9k/dfs.c
> @@ -41,7 +41,6 @@ static const int BIN_DELTA_MAX = 10;
>
> /* we need at least 3 deltas / 4 samples for a reliable chirp detection */
> #define NUM_DIFFS 3
> -static const int FFT_NUM_SAMPLES = (NUM_DIFFS + 1);

Are you sure it is correct ?
Look for other users of "FFT_NUM_SAMPLES".

> /* Threshold for difference of delta peaks */
> static const int MAX_DIFF = 2;
> @@ -101,7 +100,7 @@ static bool ath9k_check_chirping(struct ath_softc *sc, u8 *data,
> int datalen, bool is_ctl, bool is_ext)
> {
> int i;
> - int max_bin[FFT_NUM_SAMPLES];
> + int max_bin[NUM_DIFFS + 1];
> struct ath_hw *ah = sc->sc_ah;
> struct ath_common *common = ath9k_hw_common(ah);
> int prev_delta;

Always compile test the driver before sending a patch.
Also, patch title seems incorrect *ath9k*

himanshu@himanshu-Vostro-3559:~/linux-next$ git log --oneline drivers/net/wireless/ath/ath9k/dfs.c
626ab67 ath9k: dfs: use swap macro in ath9k_check_chirping
50c8cd4 ath9k: remove cast to void pointer
8fc2b61 ath9k: DFS - add pulse chirp detection for FCC
....

--
Thanks
Himanshu Jha