Re: [PATCH] EDAC: sb_edac: simplify switch statement

Nathan Chancellor
2020-09-08T04:28:59Z

On Mon, Sep 07, 2020 at 08:32:25AM -0700, trix@redhat.com wrote:
> From: Tom Rix <trix@redhat.com>
>
> clang static analyzer reports this problem
>
> sb_edac.c:959:2: warning: Undefined or garbage value
> returned to caller
> return type;
> ^~~~~~~~~~~
>
> This is a false positive.
>
> However by initializing the type to DEV_UNKNOWN the 3 case can be
> removed from the switch, saving a comparison and jump.
>
> Signed-off-by: Tom Rix <trix@redhat.com>

Some maintainers have a preference for a default case statement but
presumably this case statement has been cutting it as is so:

Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>

> ---
> drivers/edac/sb_edac.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
> index 68f2fe4df333..93daa4297f2e 100644
> --- a/drivers/edac/sb_edac.c
> +++ b/drivers/edac/sb_edac.c
> @@ -939,12 +939,9 @@ static enum dev_type sbridge_get_width(struct sbridge_pvt *pvt, u32 mtr)
>
> static enum dev_type __ibridge_get_width(u32 mtr)
> {
> - enum dev_type type;
> + enum dev_type type = DEV_UNKNOWN;
>
> switch (mtr) {
> - case 3:
> - type = DEV_UNKNOWN;
> - break;
> case 2:
> type = DEV_X16;
> break;
> --
> 2.18.1
>
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