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Message-ID: <201907300958.6BA873C4E@keescook>
Date: Tue, 30 Jul 2019 09:58:22 -0700
From: Kees Cook <keescook@...omium.org>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: Sebastian Reichel <sre@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HSI: ssi_protocol: Mark expected switch fall-throughs
On Mon, Jul 29, 2019 at 05:45:19PM -0500, Gustavo A. R. Silva wrote:
> Mark switch cases where we are expecting to fall through.
>
> This patch fixes the following warning (Building: arm):
>
> drivers/hsi/clients/ssi_protocol.c: In function ‘ssip_set_rxstate’:
> drivers/hsi/clients/ssi_protocol.c:291:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
> if (atomic_read(&ssi->tx_usecnt))
> ^
> drivers/hsi/clients/ssi_protocol.c:294:2: note: here
> case RECEIVING:
> ^~~~
>
> drivers/hsi/clients/ssi_protocol.c: In function ‘ssip_keep_alive’:
> drivers/hsi/clients/ssi_protocol.c:466:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> if (atomic_read(&ssi->tx_usecnt) == 0)
> ^
> drivers/hsi/clients/ssi_protocol.c:472:3: note: here
> case SEND_IDLE:
> ^~~~
>
> Notice that, in this particular case, the code comment is
> modified in accordance with what GCC is expecting to find.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
-Kees
> ---
> drivers/hsi/clients/ssi_protocol.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/hsi/clients/ssi_protocol.c b/drivers/hsi/clients/ssi_protocol.c
> index 9aeed98b87a1..504d00ec1ea7 100644
> --- a/drivers/hsi/clients/ssi_protocol.c
> +++ b/drivers/hsi/clients/ssi_protocol.c
> @@ -290,7 +290,7 @@ static void ssip_set_rxstate(struct ssi_protocol *ssi, unsigned int state)
> /* CMT speech workaround */
> if (atomic_read(&ssi->tx_usecnt))
> break;
> - /* Otherwise fall through */
> + /* Else, fall through */
> case RECEIVING:
> mod_timer(&ssi->keep_alive, jiffies +
> msecs_to_jiffies(SSIP_KATOUT));
> @@ -465,9 +465,10 @@ static void ssip_keep_alive(struct timer_list *t)
> case SEND_READY:
> if (atomic_read(&ssi->tx_usecnt) == 0)
> break;
> + /* Fall through */
> /*
> - * Fall through. Workaround for cmt-speech
> - * in that case we relay on audio timers.
> + * Workaround for cmt-speech in that case
> + * we relay on audio timers.
> */
> case SEND_IDLE:
> spin_unlock(&ssi->lock);
> --
> 2.22.0
>
--
Kees Cook
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