spi: spi-ti-qspi: Fix return value handling of wait_for_completion_timeout

[ Upstream commit 8b1ea69a63eb62f97cef63e6d816b64ed84e8760 ]

wait_for_completion_timeout() returns unsigned long not int.
It returns 0 if timed out, and positive if completed.
The check for <= 0 is ambiguous and should be == 0 here
indicating timeout which is the only error case.

Fixes: 5720ec0a6d26 ("spi: spi-ti-qspi: Add DMA support for QSPI mmap read")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Link: https://lore.kernel.org/r/20220411111034.24447-1-linmq006@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index e06aafe..081da1f 100644 (file)
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -448,6 +448,7 @@ static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst,
        enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
        struct dma_async_tx_descriptor *tx;
        int ret;
+       unsigned long time_left;
 
        tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len, flags);
        if (!tx) {
@@ -467,9 +468,9 @@ static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst,
        }
 
        dma_async_issue_pending(chan);
-       ret = wait_for_completion_timeout(&qspi->transfer_complete,
+       time_left = wait_for_completion_timeout(&qspi->transfer_complete,
                                          msecs_to_jiffies(len));
-       if (ret <= 0) {
+       if (time_left == 0) {
                dmaengine_terminate_sync(chan);
                dev_err(qspi->dev, "DMA wait_for_completion_timeout\n");
                return -ETIMEDOUT;