drm/xe/guc: Prevent use of uninitialized mutex

When skip_guc_pc is set and/or this is for a VF.

Fixes: 3b1592fb7835 ("drm/xe/lnl: Apply Wa_22019338487")
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240701231529.2582452-1-vinay.belgaumkar@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_guc_pc.c b/drivers/gpu/drm/xe/xe_guc_pc.c
index d88f5e9..f7b4689 100644 (file)
--- a/drivers/gpu/drm/xe/xe_guc_pc.c
+++ b/drivers/gpu/drm/xe/xe_guc_pc.c
@@ -26,6 +26,7 @@
 #include "xe_mmio.h"
 #include "xe_pcode.h"
 #include "xe_pm.h"
+#include "xe_sriov.h"
 #include "xe_wa.h"
 
 #define MCHBAR_MIRROR_BASE_SNB 0x140000
@@ -825,6 +826,9 @@ int xe_guc_pc_restore_stashed_freq(struct xe_guc_pc *pc)
 {
        int ret = 0;
 
+       if (IS_SRIOV_VF(pc_to_xe(pc)) || pc_to_xe(pc)->info.skip_guc_pc)
+               return 0;
+
        mutex_lock(&pc->freq_lock);
        ret = pc_set_max_freq(pc, pc->stashed_max_freq);
        if (!ret)