[PATCH -next] platform/x86/amd/pmf: Fix unsigned comparison with less than zero

[PATCH -next] platform/x86/amd/pmf: Fix unsigned comparison with less than zero

[Yang Li]

The return value from the call to amd_pmf_get_pprof_modes() is int.
However, the return value is being assigned to an unsigned char
variable 'mode', so making 'mode' an int.

silence the warning:
./drivers/platform/x86/amd/pmf/sps.c:183:5-9: WARNING: Unsigned expression compared with zero: mode < 0

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5995
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
---
 drivers/platform/x86/amd/pmf/sps.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/amd/pmf/sps.c b/drivers/platform/x86/amd/pmf/sps.c
index ab69d517a36a..a70e67749be3 100644
--- a/drivers/platform/x86/amd/pmf/sps.c
+++ b/drivers/platform/x86/amd/pmf/sps.c
@@ -176,7 +176,8 @@ int amd_pmf_get_pprof_modes(struct amd_pmf_dev *pmf)
 
 int amd_pmf_power_slider_update_event(struct amd_pmf_dev *dev)
 {
-	u8 mode, flag = 0;
+	u8 flag = 0;
+	int mode;
 	int src;
 
 	mode = amd_pmf_get_pprof_modes(dev);
-- 
2.20.1.7.g153144c

Re: [PATCH -next] platform/x86/amd/pmf: Fix unsigned comparison with less than zero

[Hans de Goede]

Hi,

On 7/27/23 03:43, Yang Li wrote:
> The return value from the call to amd_pmf_get_pprof_modes() is int.
> However, the return value is being assigned to an unsigned char
> variable 'mode', so making 'mode' an int.
> 
> silence the warning:
> ./drivers/platform/x86/amd/pmf/sps.c:183:5-9: WARNING: Unsigned expression compared with zero: mode < 0
> 
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5995
> Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>

Thank you for your patch, I've applied this patch to my fixes
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=fixes

Note it will show up in my fixes branch once I've pushed my
local branch there, which might take a while.

I will include this patch in my next fixes pull-req to Linus
for the current kernel development cycle.

Regards,

Hans

> ---
>  drivers/platform/x86/amd/pmf/sps.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/amd/pmf/sps.c b/drivers/platform/x86/amd/pmf/sps.c
> index ab69d517a36a..a70e67749be3 100644
> --- a/drivers/platform/x86/amd/pmf/sps.c
> +++ b/drivers/platform/x86/amd/pmf/sps.c
> @@ -176,7 +176,8 @@ int amd_pmf_get_pprof_modes(struct amd_pmf_dev *pmf)
>  
>  int amd_pmf_power_slider_update_event(struct amd_pmf_dev *dev)
>  {
> -	u8 mode, flag = 0;
> +	u8 flag = 0;
> +	int mode;
>  	int src;
>  
>  	mode = amd_pmf_get_pprof_modes(dev);