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mtd: rawnand: cadence: fix DMA device NULL pointer dereference

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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: d76d22b509 ("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>
This commit is contained in:
Niravkumar L Rabara 2025-10-23 11:32:01 +08:00 committed by Miquel Raynal
parent 9631350885
commit 5c56bf214a
1 changed files with 2 additions and 1 deletions
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3
drivers/mtd/nand/raw/cadence-nand-controller.c
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@ -2871,7 +2871,7 @@ cadence_nand_irq_cleanup(int irqnum, struct cdns_nand_ctrl *cdns_ctrl)
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,
@ -2915,6 +2915,7 @@ static int cadence_nand_init(struct cdns_nand_ctrl *cdns_ctrl)
}
}
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);