mtd: spi-nor: cadence-quadspi: fix timeout handling

wait_for_completion_timeout returns an unsigned long not an int, so
let's check its return value directly instead of storing it in ret,
and avoid checking for negative values since this cannot happen.
Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com>

drivers/mtd/spi-nor/cadence-quadspi.c

@@ -525,15 +525,14 @@ static int cqspi_indirect_read_execute(struct spi_nor *nor, u8 *rxbuf,
 	       reg_base + CQSPI_REG_INDIRECTRD);
 
 	while (remaining > 0) {
-		ret = wait_for_completion_timeout(&cqspi->transfer_complete,
-						  msecs_to_jiffies
-						  (CQSPI_READ_TIMEOUT_MS));
+		if (!wait_for_completion_timeout(&cqspi->transfer_complete,
+				msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS)))
+			ret = -ETIMEDOUT;
 
 		bytes_to_read = cqspi_get_rd_sram_level(cqspi);
 
-		if (!ret && bytes_to_read == 0) {
+		if (ret && bytes_to_read == 0) {
 			dev_err(nor->dev, "Indirect read timeout, no bytes\n");
-			ret = -ETIMEDOUT;
 			goto failrd;
 		}
 
@@ -649,10 +648,8 @@ static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
 		iowrite32_rep(cqspi->ahb_base, txbuf,
 			      DIV_ROUND_UP(write_bytes, 4));
 
-		ret = wait_for_completion_timeout(&cqspi->transfer_complete,
-						  msecs_to_jiffies
-						  (CQSPI_TIMEOUT_MS));
-		if (!ret) {
+		if (!wait_for_completion_timeout(&cqspi->transfer_complete,
+					msecs_to_jiffies(CQSPI_TIMEOUT_MS))) {
 			dev_err(nor->dev, "Indirect write timeout\n");
 			ret = -ETIMEDOUT;
 			goto failwr;
@@ -986,9 +983,8 @@ static int cqspi_direct_read_execute(struct spi_nor *nor, u_char *buf,
 	}
 
 	dma_async_issue_pending(cqspi->rx_chan);
-	ret = wait_for_completion_timeout(&cqspi->rx_dma_complete,
-					  msecs_to_jiffies(len));
-	if (ret <= 0) {
+	if (!wait_for_completion_timeout(&cqspi->rx_dma_complete,
+					 msecs_to_jiffies(len))) {
 		dmaengine_terminate_sync(cqspi->rx_chan);
 		dev_err(nor->dev, "DMA wait_for_completion_timeout\n");
 		ret = -ETIMEDOUT;