On Sun, 2017-02-19 at 01:50 +0530, simran singhal wrote:
> Simplify function returns by merging assignment and return into
> one command line.
> Found with Coccinelle
> @@
> local idexpression ret;
> expression e;
> @@
>
> -ret =
> +return
> e;
> -return ret;
[]
> diff --git a/drivers/staging/vt6655/card.c b/drivers/staging/vt6655/card.c
[]
> @@ -920,7 +920,7 @@ u64 CARDqGetTSFOffset(unsigned char byRxRate, u64 qwTSF1, u64 qwTSF2)
>
> qwTSFOffset = qwTSF1 - qwTSF2;
>
> - return qwTSFOffset;
> + return qwTSF1 - qwTSF2;
> }
It's not a problem here but generically, this transformation may
introduce defects when the local idexpression being assigned to
is a smaller type than the return type. e.g.:
u64 foo(u64 a, u64 b)
{
u8 bar = a - b;
return bar;
}
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