[PATCH AUTOSEL 6.12 64/93] drm/xe/uc: Remove static from loop variable

[PATCH AUTOSEL 6.12 64/93] drm/xe/uc: Remove static from loop variable

[Sasha Levin]

From: Lucas De Marchi <lucas.demarchi@intel.com>

[ Upstream commit 75584c8213d341ddd5b7c72abf822e62f4b3ab27 ]

The `entries` variable is used to loop through the array - it's supposed
to be const, but not static.

Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250307-xe-per-gt-fw-v1-1-459574d76400@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

**YES** This commit should be backported to stable kernel trees. Here's
my extensive analysis: ## Commit Analysis **Type of Issue:** This commit
fixes an incorrect use of the `static` storage class specifier on a
local variable that should be a simple `const` pointer. **Code
Analysis:** - The problematic line changes `static const struct
uc_fw_entry *entries;` to `const struct uc_fw_entry *entries;` - This
variable is used as a loop iteration pointer in the
`uc_fw_auto_select()` function - The variable gets assigned from
`blobs_all[uc_fw->type].entries` and is used to iterate through firmware
entries - The `static` keyword is incorrect here because this should be
a local variable that gets reinitialized on each function call **Impact
Assessment:** - **Bug severity:** This is a subtle but real bug that
affects driver correctness - **User impact:** Could cause firmware
selection issues in Intel Xe GPU drivers, potentially leading to
graphics driver failures or incorrect firmware loading - **Risk:** The
incorrect `static` storage could cause the `entries` pointer to retain
stale values across function calls, leading to unpredictable firmware
selection behavior **Backport Suitability Criteria:** 1. ✅ **Fixes a
real bug:** Yes, incorrect storage class affects program correctness 2.
✅ **Small and contained:** Single line change, minimal risk 3. ✅ **No
side effects:** Pure bug fix with no behavioral changes beyond
correcting the error 4. ✅ **No architectural changes:** Simple variable
declaration fix 5. ✅ **Minimal regression risk:** Extremely low risk -
makes the code work as originally intended 6. ✅ **Follows stable tree
rules:** Important bugfix, minimal risk, contained change **Historical
Precedent:** This commit is nearly identical to the i915 commit
`5821a0bbb4c3` which was backported (marked as "YES" in the reference
commits). Both commits: - Fix the exact same type of bug (accidental
`static` on local variable) - Affect similar firmware selection code in
Intel GPU drivers - Have identical risk profiles and change patterns -
Were authored by the same team working on Intel GPU microcontroller
firmware **Conclusion:** This is a clear candidate for backporting - it
fixes a genuine bug that could affect system stability, has minimal risk
of regression, and follows the established pattern of similar fixes that
have been successfully backported.

 drivers/gpu/drm/xe/xe_uc_fw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_uc_fw.c b/drivers/gpu/drm/xe/xe_uc_fw.c
index d431d0031185e..16649652c8151 100644
--- a/drivers/gpu/drm/xe/xe_uc_fw.c
+++ b/drivers/gpu/drm/xe/xe_uc_fw.c
@@ -221,8 +221,8 @@ uc_fw_auto_select(struct xe_device *xe, struct xe_uc_fw *uc_fw)
 		[XE_UC_FW_TYPE_HUC] = { entries_huc, ARRAY_SIZE(entries_huc) },
 		[XE_UC_FW_TYPE_GSC] = { entries_gsc, ARRAY_SIZE(entries_gsc) },
 	};
-	static const struct uc_fw_entry *entries;
 	enum xe_platform p = xe->info.platform;
+	const struct uc_fw_entry *entries;
 	u32 count;
 	int i;
 
-- 
2.39.5