5.15-stable review patch. If anyone has any objections, please let me know.
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From: Niravkumar L Rabara niravkumarlaxmidas.rabara@altera.com
commit 5c56bf214af85ca042bf97f8584aab2151035840 upstream.
The DMA device pointer `dma_dev` was being dereferenced before ensuring that `cdns_ctrl->dmac` is properly initialized.
Move the assignment of `dma_dev` after successfully acquiring the DMA channel to ensure the pointer is valid before use.
Fixes: d76d22b5096c ("mtd: rawnand: cadence: use dma_map_resource for sdma address") Cc: stable@vger.kernel.org Signed-off-by: Niravkumar L Rabara niravkumarlaxmidas.rabara@altera.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mtd/nand/raw/cadence-nand-controller.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/mtd/nand/raw/cadence-nand-controller.c +++ b/drivers/mtd/nand/raw/cadence-nand-controller.c @@ -2833,7 +2833,7 @@ cadence_nand_irq_cleanup(int irqnum, str static int cadence_nand_init(struct cdns_nand_ctrl *cdns_ctrl) { dma_cap_mask_t mask; - struct dma_device *dma_dev = cdns_ctrl->dmac->device; + struct dma_device *dma_dev; int ret;
cdns_ctrl->cdma_desc = dma_alloc_coherent(cdns_ctrl->dev, @@ -2877,6 +2877,7 @@ static int cadence_nand_init(struct cdns } }
+ dma_dev = cdns_ctrl->dmac->device; cdns_ctrl->io.iova_dma = dma_map_resource(dma_dev->dev, cdns_ctrl->io.dma, cdns_ctrl->io.size, DMA_BIDIRECTIONAL, 0);