From: Kees Cook <keescook@chromium.org>
To: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
Aaro Koskinen <aaro.koskinen@iki.fi>,
Tony Lindgren <tony@atomide.com>,
linux-kernel@vger.kernel.org,
Russell King <linux@armlinux.org.uk>,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] ARM: OMAP: dma: Mark expected switch fall-throughs
Date: Mon, 29 Jul 2019 09:34:40 -0700 [thread overview]
Message-ID: <201907290934.B2053972E3@keescook> (raw)
In-Reply-To: <20190728232240.GA22393@embeddedor>
On Sun, Jul 28, 2019 at 06:22:40PM -0500, Gustavo A. R. Silva wrote:
> Mark switch cases where we are expecting to fall through.
>
> This patch fixes the following warnings:
>
> arch/arm/plat-omap/dma.c: In function 'omap_set_dma_src_burst_mode':
> arch/arm/plat-omap/dma.c:384:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
> if (dma_omap2plus()) {
> ^
> arch/arm/plat-omap/dma.c:393:2: note: here
> case OMAP_DMA_DATA_BURST_16:
> ^~~~
> arch/arm/plat-omap/dma.c:394:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
> if (dma_omap2plus()) {
> ^
> arch/arm/plat-omap/dma.c:402:2: note: here
> default:
> ^~~~~~~
> arch/arm/plat-omap/dma.c: In function 'omap_set_dma_dest_burst_mode':
> arch/arm/plat-omap/dma.c:473:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
> if (dma_omap2plus()) {
> ^
> arch/arm/plat-omap/dma.c:481:2: note: here
> default:
> ^~~~~~~
>
> Notice that, in this particular case, the code comment is
> modified in accordance with what GCC is expecting to find.
>
> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-Kees
> ---
> arch/arm/plat-omap/dma.c | 14 +++++---------
> 1 file changed, 5 insertions(+), 9 deletions(-)
>
> diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
> index 79f43acf9acb..08c99413d02c 100644
> --- a/arch/arm/plat-omap/dma.c
> +++ b/arch/arm/plat-omap/dma.c
> @@ -388,17 +388,15 @@ void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
> /*
> * not supported by current hardware on OMAP1
> * w |= (0x03 << 7);
> - * fall through
> */
> + /* fall through */
> case OMAP_DMA_DATA_BURST_16:
> if (dma_omap2plus()) {
> burst = 0x3;
> break;
> }
> - /*
> - * OMAP1 don't support burst 16
> - * fall through
> - */
> + /* OMAP1 don't support burst 16 */
> + /* fall through */
> default:
> BUG();
> }
> @@ -474,10 +472,8 @@ void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
> burst = 0x3;
> break;
> }
> - /*
> - * OMAP1 don't support burst 16
> - * fall through
> - */
> + /* OMAP1 don't support burst 16 */
> + /* fall through */
> default:
> printk(KERN_ERR "Invalid DMA burst mode\n");
> BUG();
> --
> 2.22.0
>
--
Kees Cook
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next prev parent reply other threads:[~2019-07-29 16:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-28 23:22 [PATCH] ARM: OMAP: dma: Mark expected switch fall-throughs Gustavo A. R. Silva
2019-07-29 16:34 ` Kees Cook [this message]
2019-08-13 12:00 ` Tony Lindgren
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