[PATCH] drm/xe/guc: Fail immediately on GuC load error

[Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>]

By using the same variable for both the return of poll_timeout_us and
the return of the polled function guc_wait_ucode, the return value of
the latter is overwritten and lost after exiting the polling loop. Since
guc_wait_ucode returns -1 on GuC load failure, we lose that information
and always continue as if the GuC had been loaded correctly.

This is fixed by simply using 2 separate variables.

Fixes: a4916b4da448 ("drm/xe/guc: Refactor GuC load to use poll_timeout_us()")
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
---
 drivers/gpu/drm/xe/xe_guc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_guc.c b/drivers/gpu/drm/xe/xe_guc.c
index cbbb4d665b8f..aacf77f09522 100644
--- a/drivers/gpu/drm/xe/xe_guc.c
+++ b/drivers/gpu/drm/xe/xe_guc.c
@@ -1179,6 +1179,7 @@ static int guc_wait_ucode(struct xe_guc *guc)
 	struct xe_guc_pc *guc_pc = &gt->uc.guc.pc;
 	u32 before_freq, act_freq, cur_freq;
 	u32 status = 0, tries = 0;
+	int load_result;
 	ktime_t before;
 	u64 delta_ms;
 	int ret;
@@ -1186,7 +1187,7 @@ static int guc_wait_ucode(struct xe_guc *guc)
 	before_freq = xe_guc_pc_get_act_freq(guc_pc);
 	before = ktime_get();
 
-	ret = poll_timeout_us(ret = guc_load_done(gt, &status, &tries), ret,
+	ret = poll_timeout_us(load_result = guc_load_done(gt, &status, &tries), load_result,
 			      10 * USEC_PER_MSEC,
 			      GUC_LOAD_TIMEOUT_SEC * USEC_PER_SEC, false);
 
@@ -1194,7 +1195,7 @@ static int guc_wait_ucode(struct xe_guc *guc)
 	act_freq = xe_guc_pc_get_act_freq(guc_pc);
 	cur_freq = xe_guc_pc_get_cur_freq_fw(guc_pc);
 
-	if (ret) {
+	if (ret || load_result <= 0) {
 		xe_gt_err(gt, "load failed: status = 0x%08X, time = %lldms, freq = %dMHz (req %dMHz)\n",
 			  status, delta_ms, xe_guc_pc_get_act_freq(guc_pc),
 			  xe_guc_pc_get_cur_freq_fw(guc_pc));
-- 
2.43.0