This is a note to let you know that I've just added the patch titled iommu/mediatek: Fix crash on isr after kexec() to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iommu-mediatek-fix-crash-on-isr-after-kexec.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 56d2a63c9091e0c839b166535c5b377e69d4be25 Author: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> Date: Mon Nov 28 23:16:48 2022 +0100 iommu/mediatek: Fix crash on isr after kexec() [ Upstream commit 00ef8885a945c37551547d8ac8361cacd20c4e42 ] If the system is rebooted via isr(), the IRQ handler might be triggered before the domain is initialized. Resulting on an invalid memory access error. Fix: [ 0.500930] Unable to handle kernel read from unreadable memory at virtual address 0000000000000070 [ 0.501166] Call trace: [ 0.501174] report_iommu_fault+0x28/0xfc [ 0.501180] mtk_iommu_isr+0x10c/0x1c0 Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx> Link: https://lore.kernel.org/r/20221125-mtk-iommu-v2-0-e168dff7d43e@xxxxxxxxxxxx [ joro: Fixed spelling in commit message ] Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index dad2f238ffbf..56d007582b6f 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -454,7 +454,7 @@ static irqreturn_t mtk_iommu_isr(int irq, void *dev_id) fault_larb = data->plat_data->larbid_remap[fault_larb][sub_comm]; } - if (report_iommu_fault(&dom->domain, bank->parent_dev, fault_iova, + if (!dom || report_iommu_fault(&dom->domain, bank->parent_dev, fault_iova, write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) { dev_err_ratelimited( bank->parent_dev,