From: Johan Hovold Date: Fri, 10 Apr 2026 09:49:25 +0000 (+0200) Subject: spi: s3c64xx: fix NULL-deref on driver unbind X-Git-Tag: v7.1-rc1~153^2~4 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=45daacbead8a009844bd5dba6cfa731332184d17;p=thirdparty%2Fkernel%2Flinux.git spi: s3c64xx: fix NULL-deref on driver unbind A change moving DMA channel allocation from probe() back to s3c64xx_spi_prepare_transfer() failed to remove the corresponding deallocation from remove(). Drop the bogus DMA channel release from remove() to avoid triggering a NULL-pointer dereference on driver unbind. This issue was flagged by Sashiko when reviewing a controller deregistration fix. Fixes: f52b03c70744 ("spi: s3c64xx: requests spi-dma channel only during data transfer") Cc: stable@vger.kernel.org # 6.0 Cc: Adithya K V Link: https://sashiko.dev/#/patchset/20260410081757.503099-1-johan%40kernel.org Signed-off-by: Johan Hovold Link: https://patch.msgid.link/20260410094925.518343-1-johan@kernel.org Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 95b61264b6799..37176e557099d 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -1403,11 +1403,6 @@ static void s3c64xx_spi_remove(struct platform_device *pdev) writel(0, sdd->regs + S3C64XX_SPI_INT_EN); - if (!is_polling(sdd)) { - dma_release_channel(sdd->rx_dma.ch); - dma_release_channel(sdd->tx_dma.ch); - } - pm_runtime_put_noidle(&pdev->dev); pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev);