From: Niravkumar L Rabara <niravkumar.l.rabara@xxxxxxxxx>
commit 60255f3704fde70ed3c4d62f919aa4b46f841f70 upstream.
Add NULL check before variable dereference to fix static checker warning.
Fixes: d76d22b5096c ("mtd: rawnand: cadence: use dma_map_resource for sdma address")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Closes: https://lore.kernel.org/all/e448a22c-bada-448d-9167-7af71305130d@stanley.mountain/
Signed-off-by: Niravkumar L Rabara <niravkumar.l.rabara@xxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/nand/raw/cadence-nand-controller.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/mtd/nand/raw/cadence-nand-controller.c
+++ b/drivers/mtd/nand/raw/cadence-nand-controller.c
@@ -2934,8 +2934,10 @@ free_buf_desc:
static void cadence_nand_remove(struct cdns_nand_ctrl *cdns_ctrl)
{
cadence_nand_chips_cleanup(cdns_ctrl);
- dma_unmap_resource(cdns_ctrl->dmac->device->dev, cdns_ctrl->io.iova_dma,
- cdns_ctrl->io.size, DMA_BIDIRECTIONAL, 0);
+ if (cdns_ctrl->dmac)
+ dma_unmap_resource(cdns_ctrl->dmac->device->dev,
+ cdns_ctrl->io.iova_dma, cdns_ctrl->io.size,
+ DMA_BIDIRECTIONAL, 0);
cadence_nand_irq_cleanup(cdns_ctrl->irq, cdns_ctrl);
kfree(cdns_ctrl->buf);
dma_free_coherent(cdns_ctrl->dev, sizeof(struct cadence_nand_cdma_desc),
Patches currently in stable-queue which might be from niravkumar.l.rabara@xxxxxxxxx are
queue-5.15/mtd-rawnand-cadence-fix-error-code-in-cadence_nand_init.patch
queue-5.15/mtd-rawnand-cadence-fix-unchecked-dereference.patch
queue-5.15/mtd-rawnand-cadence-fix-incorrect-device-in-dma_unmap_single.patch
queue-5.15/mtd-rawnand-cadence-use-dma_map_resource-for-sdma-address.patch
