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platform: sps: Fix an unsigned comparison that can never be negative

PATCH In review [email protected] 2 participants 2 messages Aug 13, 2023

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PATCH v2 1/1 platform: sps: Fix an unsigned comparison that can never be negative

From: Rajeshwar R Shinde <[email protected]>

The variable 'mode' is declared as unsigned int in local function. The return value of function amd_pmf_get_pprof_modes(dev) is int and it is stored in the 'mode' variable. Also the value of 'mode' variable is compared with 0 which is signed int by default. Thus redeclaring the variable to signed int.

This fixes warning such as:
drivers/platform/x86/amd/pmf/sps.c:128:5-9:
WARNING: Unsigned expression compared with zero: mode < 0

---
v1->v2
changed the commit subject

---
 drivers/platform/x86/amd/pmf/sps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
drivers/platform/x86/amd/pmf/sps.c +1 -1
index ab69d517a36a..703723a66830 100644
@@ -176,7 +176,7 @@ 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;
+	int mode, flag = 0;
 	int src;
 
 	mode = amd_pmf_get_pprof_modes(dev);
Signature · 1 line
2.25.1
#1 lore raw

Hi,

Quoted 8 lines · On 8/13/23 13:08, [email protected] wrote:

From: Rajeshwar R Shinde <[email protected]>

The variable 'mode' is declared as unsigned int in local function. The return value of function amd_pmf_get_pprof_modes(dev) is int and it is stored in the 'mode' variable. Also the value of 'mode' variable is compared with 0 which is signed int by default. Thus redeclaring the variable to signed int.

Quoted 5 lines

This fixes warning such as:
drivers/platform/x86/amd/pmf/sps.c:128:5-9:
WARNING: Unsigned expression compared with zero: mode < 0

Thank you your patch.

This has already been fixed by a patch which is pending in the pdx86/fixes branch:

https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/commit/?h=fixes&id=785c00993dc4c4bb2f7b0f3a3f29c03a6f7aab2e
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=fixes

Regards,

Hans

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