[PATCH] drm/i915/guc: Actually return an error if GuC version range check fails

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

Dan Carpenter pointed out that 'err' was not being set in the case
where the GuC firmware version range check fails. Fix that.

Note that while this is bug fix for a previous patch (see Fixes tag
below). It is an exceedingly low risk bug. The range check is
asserting that the GuC firmware version is within spec. So it should
not be possible to ever have a firmware file that fails this check. If
larger version numbers are required in the future, that would be a
backwards breaking spec change and thus require a major version bump,
in which case an old i915 driver would not load that new version anyway.

Fixes: 9bbba0667f37 ("drm/i915/guc: Use GuC submission API version number")
Reported-by: Dan Carpenter <error27 at gmail.com>
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Alan Previn <alan.previn.teres.alexis at intel.com>
Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Andi Shyti <andi.shyti at linux.intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index a82a53dbbc86d..6b71b9febd74c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -636,9 +636,10 @@ static bool is_ver_8bit(struct intel_uc_fw_ver *ver)
 	return ver->major < 0xFF && ver->minor < 0xFF && ver->patch < 0xFF;
 }
 
-static bool guc_check_version_range(struct intel_uc_fw *uc_fw)
+static int guc_check_version_range(struct intel_uc_fw *uc_fw)
 {
 	struct intel_guc *guc = container_of(uc_fw, struct intel_guc, fw);
+	struct intel_gt *gt = __uc_fw_to_gt(uc_fw);
 
 	/*
 	 * GuC version number components are defined as being 8-bits.
@@ -647,24 +648,24 @@ static bool guc_check_version_range(struct intel_uc_fw *uc_fw)
 	 */
 
 	if (!is_ver_8bit(&uc_fw->file_selected.ver)) {
-		gt_warn(__uc_fw_to_gt(uc_fw), "%s firmware: invalid file version: 0x%02X:%02X:%02X\n",
+		gt_warn(gt, "%s firmware: invalid file version: 0x%02X:%02X:%02X\n",
 			intel_uc_fw_type_repr(uc_fw->type),
 			uc_fw->file_selected.ver.major,
 			uc_fw->file_selected.ver.minor,
 			uc_fw->file_selected.ver.patch);
-		return false;
+		return -EINVAL;
 	}
 
 	if (!is_ver_8bit(&guc->submission_version)) {
-		gt_warn(__uc_fw_to_gt(uc_fw), "%s firmware: invalid submit version: 0x%02X:%02X:%02X\n",
+		gt_warn(gt, "%s firmware: invalid submit version: 0x%02X:%02X:%02X\n",
 			intel_uc_fw_type_repr(uc_fw->type),
 			guc->submission_version.major,
 			guc->submission_version.minor,
 			guc->submission_version.patch);
-		return false;
+		return -EINVAL;
 	}
 
-	return true;
+	return i915_inject_probe_error(gt->i915, -EINVAL);
 }
 
 static int check_fw_header(struct intel_gt *gt,
@@ -773,8 +774,11 @@ int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw)
 	if (err)
 		goto fail;
 
-	if (uc_fw->type == INTEL_UC_FW_TYPE_GUC && !guc_check_version_range(uc_fw))
-		goto fail;
+	if (uc_fw->type == INTEL_UC_FW_TYPE_GUC) {
+		err = guc_check_version_range(uc_fw);
+		if (err)
+			goto fail;
+	}
 
 	if (uc_fw->file_wanted.ver.major && uc_fw->file_selected.ver.major) {
 		/* Check the file's major version was as it claimed */
-- 
2.39.1