From da840f354836d3303400ae5f26a655daed542477 Mon Sep 17 00:00:00 2001 From: Miaoqian Lin Date: Mon, 11 Apr 2022 11:10:33 +0000 Subject: [PATCH] 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 Link: https://lore.kernel.org/r/20220411111034.24447-1-linmq006@gmail.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-ti-qspi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c index e06aafe169e0c..081da1fd3fd7e 100644 --- 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;