Re: [PATCH] ocxl: fix signed comparison with less than zero

[Andrew Donnellan]

On 31/01/18 02:11, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> Currently the comparison of used < 0 is always false because
> uses is a size_t. Fix this by making used a ssize_t type.
>
> Detected by Coccinelle:
> drivers/misc/ocxl/file.c:320:6-10: WARNING: Unsigned expression
> compared with zero: used < 0
>
> Fixes: 5ef3166e8a32 ("ocxl: Driver code for 'generic' opencapi devices")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>

Thanks for picking this up!

Acked-by: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>

> ---
>   drivers/misc/ocxl/file.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
> index c90c1a578d2f..1287e4430e6b 100644
> --- a/drivers/misc/ocxl/file.c
> +++ b/drivers/misc/ocxl/file.c
> @@ -277,7 +277,7 @@ static ssize_t afu_read(struct file *file, char __user *buf, size_t count,
>   	struct ocxl_context *ctx = file->private_data;
>   	struct ocxl_kernel_event_header header;
>   	ssize_t rc;
> -	size_t used = 0;
> +	ssize_t used = 0;
>   	DEFINE_WAIT(event_wait);
>   
>   	memset(&header, 0, sizeof(header));

--
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@xxxxxxxxxxx  IBM Australia Limited