drm/i915/slpc: Fix inconsistent locked return

Fix for intel_guc_slpc_set_min_freq() warn:
inconsistent returns '&slpc->lock'.

v2: Avoid with_intel_runtime_pm with the
    internal goto/return. (Ashutosh)
    Also standardize the 'ret' if this came from
    the efficient setup. And avoid the 'unlikely'.

Fixes: 95ccf312 ("drm/i915/guc/slpc: Allow SLPC to use efficient frequency")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220830193537.52201-1-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c

@@ -467,33 +467,33 @@ int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val)
 
 	/* Need a lock now since waitboost can be modifying min as well */
 	mutex_lock(&slpc->lock);
-
-	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
+	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
 
 	/* Ignore efficient freq if lower min freq is requested */
 	ret = slpc_set_param(slpc,
 			     SLPC_PARAM_IGNORE_EFFICIENT_FREQUENCY,
 			     val < slpc->rp1_freq);
-		if (unlikely(ret)) {
+	if (ret) {
 		i915_probe_error(i915, "Failed to toggle efficient freq (%pe)\n",
 				 ERR_PTR(ret));
-			return ret;
+		goto out;
 	}
 
 	ret = slpc_set_param(slpc,
 			     SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
 			     val);
 
-		/* Return standardized err code for sysfs calls */
-		if (ret)
-			ret = -EIO;
-	}
-
 	if (!ret)
 		slpc->min_freq_softlimit = val;
 
+out:
+	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
 	mutex_unlock(&slpc->lock);
 
+	/* Return standardized err code for sysfs calls */
+	if (ret)
+		ret = -EIO;
+
 	return ret;
 }