[PATCH v2 24/26] dmaengine: dw-edma: Skip cleanup procedure if no private data found

Serge Semin
2022-05-03T22:53:13Z

DW eDMA driver private data is preserved in the passed DW eDMA chip info
structure. If either probe procedure failed or for some reason the passed
info object doesn't have private data pointer initialized we need to halt
the DMA device cleanup procedure in order to prevent possible system
crashes.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
---
drivers/dma/dw-edma/dw-edma-core.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 908607785401..561686b51915 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -1035,6 +1035,10 @@ int dw_edma_remove(struct dw_edma_chip *chip)
struct dw_edma *dw = chip->dw;
int i;

+ /* Skip removal if no private data found */
+ if (!dw)
+ return -ENODEV;
+
/* Disable eDMA */
dw_edma_v0_core_off(dw);

--
2.35.1