[PATCH v5 04/14] dmaengine: dw-edma: Initialize IRQ data before requesting IRQs
From: Koichiro Den
Date: Fri Jul 17 2026 - 01:06:14 EST
dw_edma_irq_request() passes struct dw_edma_irq to request_irq() before
dw_edma_channel_setup() fills the back pointer. A shared interrupt can
therefore enter the handler with dw_irq->dw still NULL, leading to a
NULL pointer dereference.
Set the back pointer before installing each handler.
Fixes: e63d79d1ffcd ("dmaengine: Add Synopsys eDMA IP core driver")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
Signed-off-by: Koichiro Den <den@xxxxxxxxxxxxx>
---
Changes in v5:
- No changes.
drivers/dma/dw-edma/dw-edma-core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 8a1ec0fd057b..392981f3b7bb 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -854,7 +854,6 @@ static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc)
else
irq->rd_mask |= BIT(chan->id);
- irq->dw = dw;
memcpy(&chan->msi, &irq->msi, sizeof(chan->msi));
dev_vdbg(dev, "MSI:\t\tChannel %s[%u] addr=0x%.8x%.8x, data=0x%.8x\n",
@@ -935,6 +934,7 @@ static int dw_edma_irq_request(struct dw_edma *dw,
if (chip->nr_irqs == 1) {
/* Common IRQ shared among all channels */
irq = chip->ops->irq_vector(dev, 0);
+ dw->irq[0].dw = dw;
err = request_irq(irq, dw_edma_interrupt_common,
IRQF_SHARED, dw->name, &dw->irq[0]);
if (err) {
@@ -957,6 +957,7 @@ static int dw_edma_irq_request(struct dw_edma *dw,
for (i = 0; i < (*wr_alloc + *rd_alloc); i++) {
irq = chip->ops->irq_vector(dev, i);
+ dw->irq[i].dw = dw;
err = request_irq(irq,
i < *wr_alloc ?
dw_edma_interrupt_write :
--
2.51.0