MLK-16437: dma: fsl-edma-v3: fix kernel crash while edma interrupt trigger after channel disabled
edma interrupt may come after channel terminated, so should ignore interrupts, else kernel crash as below since fsl_chan->edesc set to NULL when terminate. 606.837306] Unable to handle kernel NULL pointer dereference at virtual address 00000060 [ 606.845411] pgd = ffff000009295000 [ 606.848814] [00000060] *pgd=00000008bfffe003[ 606.852906] , *pud=00000008bfffd003 , *pmd=0000000000000000[ 606.858395] [ 606.859885] Internal error: Oops: 96000006 1 PREEMPT SMP [ 606.865460] Modules linked in: [ 606.868522] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.11-03371-g9904ea0 #42 [ 606.875832] Hardware name: Freescale i.MX8QXP LPDDR4 ARM2 (DT) [ 606.881662] task: ffff000009120680 task.stack: ffff000009110000 [ 606.887588] PC is at fsl_edma3_tx_handler+0x50/0x150 Signed-off-by: Robin Gong <yibin.gong@nxp.com> Tested-by: Daniel Baluta <daniel.baluta@nxp.com>pull/10/head
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80894c6200
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34b8196453
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@ -689,6 +689,11 @@ static irqreturn_t fsl_edma3_tx_handler(int irq, void *dev_id)
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writel(1, base_addr + EDMA_CH_INT);
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spin_lock(&fsl_chan->vchan.lock);
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/* Ignore this interrupt since channel has been disabled already */
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if (!fsl_chan->edesc)
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return IRQ_HANDLED;
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if (!fsl_chan->edesc->iscyclic) {
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fsl_edma3_get_realcnt(fsl_chan);
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list_del(&fsl_chan->edesc->vdesc.node);
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