diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/806-dma-0010-MLK-16437-dma-fsl-edma-v3-fix-kernel-crash-while-edm.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/806-dma-0010-MLK-16437-dma-fsl-edma-v3-fix-kernel-crash-while-edm.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/806-dma-0010-MLK-16437-dma-fsl-edma-v3-fix-kernel-crash-while-edm.patch b/target/linux/layerscape/patches-5.4/806-dma-0010-MLK-16437-dma-fsl-edma-v3-fix-kernel-crash-while-edm.patch new file mode 100644 index 0000000000..6bc905c049 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/806-dma-0010-MLK-16437-dma-fsl-edma-v3-fix-kernel-crash-while-edm.patch @@ -0,0 +1,42 @@ +From e0d0cdff101b2f00ce1fd420522bd22bb6eebd9f Mon Sep 17 00:00:00 2001 +From: Robin Gong <yibin.gong@nxp.com> +Date: Wed, 13 Sep 2017 16:39:49 +0800 +Subject: [PATCH] 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> +(cherry picked from commit 625afad5a0900bc3e3288510f61647b1d891a5a4) +--- + drivers/dma/fsl-edma-v3.c | 5 +++++ + 1 file changed, 5 insertions(+) + +--- a/drivers/dma/fsl-edma-v3.c ++++ b/drivers/dma/fsl-edma-v3.c +@@ -689,6 +689,11 @@ static irqreturn_t fsl_edma3_tx_handler( + writel(1, base_addr + EDMA_CH_INT); + + spin_lock(&fsl_chan->vchan.lock); ++ ++ /* Ignore this interrupt since channel has been disabled already */ ++ if (!fsl_chan->edesc) ++ return IRQ_HANDLED; ++ + if (!fsl_chan->edesc->iscyclic) { + fsl_edma3_get_realcnt(fsl_chan); + list_del(&fsl_chan->edesc->vdesc.node); |