linux-kernel - RE: [PATCH] doc: mei: fix handling return value of mei_recv

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Date:	Mon, 14 Dec 2015 12:04:40 +0000
From:	"Winkler, Tomas" <tomas.winkler@...el.com>
To:	Andrzej Hajda <a.hajda@...sung.com>
CC:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jonathan Corbet <corbet@....net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"Greg KH (gregkh@...uxfoundation.org)" <gregkh@...uxfoundation.org>
Subject: RE: [PATCH] doc: mei: fix handling return value of mei_recv_msg

> The function can return negative values, so its result should
> be assigned to signed variable.
> 
> The problem has been detected using proposed semantic patch
> scripts/coccinelle/tests/assign_signed_to_unsigned.cocci [1].
> 
> [1]: http://permalink.gmane.org/gmane.linux.kernel/2046107
> 
> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
> ---
>  Documentation/misc-devices/mei/mei-amt-version.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/misc-devices/mei/mei-amt-version.c
> b/Documentation/misc-devices/mei/mei-amt-version.c
> index 57d0d87..33e67bd 100644
> --- a/Documentation/misc-devices/mei/mei-amt-version.c
> +++ b/Documentation/misc-devices/mei/mei-amt-version.c
> @@ -370,7 +370,7 @@ static uint32_t amt_host_if_call(struct amt_host_if
> *acmd,
>  			unsigned int expected_sz)
>  {
>  	uint32_t in_buf_sz;
If are you at that then it will be desired to change the type to ssize_t also for in_buf_sz as mei_recv_msg takes ssize_t argument. 
> -	uint32_t out_buf_sz;
> +	ssize_t out_buf_sz;
>  	ssize_t written;
>  	uint32_t status;
>  	struct amt_host_if_resp_header *msg_hdr;

Thanks
Tomas

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