[PATCH] drm/amd/display: Fixed the unused-but-set-variable warning

[Aashish Sharma <shraash@google.com>]

Fixed this kernel test robot warning:

drivers/gpu/drm/amd/amdgpu/../display/dmub/inc/dmub_cmd.h:2893:12:
warning: variable 'temp' set but not used [-Wunused-but-set-variable]

Replaced the assignment to the unused temp variable with READ_ONCE()
macro to flush the writes.

Signed-off-by: Aashish Sharma <shraash@google.com>
---
 drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
index 873ecd04e01d..b7981a781701 100644
--- a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
+++ b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
@@ -2913,13 +2913,12 @@ static inline void dmub_rb_flush_pending(const struct dmub_rb *rb)
 	uint32_t wptr = rb->wrpt;
 
 	while (rptr != wptr) {
-		uint64_t volatile *data = (uint64_t volatile *)((uint8_t *)(rb->base_address) + rptr);
+		uint64_t *data = (uint64_t volatile *)((uint8_t *)(rb->base_address) + rptr);
 		//uint64_t volatile *p = (uint64_t volatile *)data;
-		uint64_t temp;
 		uint8_t i;
 
 		for (i = 0; i < DMUB_RB_CMD_SIZE / sizeof(uint64_t); i++)
-			temp = *data++;
+			(void)READ_ONCE(*data++);
 
 		rptr += DMUB_RB_CMD_SIZE;
 		if (rptr >= rb->capacity)
-- 
2.35.1.723.g4982287a31-goog