From: Pan Bian <bianpan2016@163.com> [ Upstream commit e9a8ba9769a0e354341bc6cc01b98aadcea1dfe9 ] The channels spfi->tx_ch and spfi->rx_ch are not set to NULL after they are released. As a result, they will be released again, either on the error handling branch in the same function or in the corresponding remove function, i.e. img_spfi_remove(). This patch fixes the bug by setting the two members to NULL. Signed-off-by: Pan Bian <bianpan2016@163.com> Link: https://lore.kernel.org/r/1573007769-20131-1-git-send-email-bianpan2016@163.... Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- drivers/spi/spi-img-spfi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c index e6eb979..e4b31d6 100644 --- a/drivers/spi/spi-img-spfi.c +++ b/drivers/spi/spi-img-spfi.c @@ -676,6 +676,8 @@ static int img_spfi_probe(struct platform_device *pdev) dma_release_channel(spfi->tx_ch); if (spfi->rx_ch) dma_release_channel(spfi->rx_ch); + spfi->tx_ch = NULL; + spfi->rx_ch = NULL; dev_warn(spfi->dev, "Failed to get DMA channels, falling back to PIO mode\n"); } else { master->dma_tx = spfi->tx_ch; -- 1.8.3