From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
iommu@lists.linux-foundation.org, Joerg Roedel <jroedel@suse.de>
Subject: [PATCH AUTOSEL 4.9 162/251] iommu/amd: Make iommu_disable safer
Date: Thu, 16 Jan 2020 12:35:11 -0500 [thread overview]
Message-ID: <20200116173641.22137-122-sashal@kernel.org> (raw)
In-Reply-To: <20200116173641.22137-1-sashal@kernel.org>
From: Kevin Mitchell <kevmitch@arista.com>
[ Upstream commit 3ddbe913e55516d3e2165d43d4d5570761769878 ]
Make it safe to call iommu_disable during early init error conditions
before mmio_base is set, but after the struct amd_iommu has been added
to the amd_iommu_list. For example, this happens if firmware fails to
fill in mmio_phys in the ACPI table leading to a NULL pointer
dereference in iommu_feature_disable.
Fixes: 2c0ae1720c09c ('iommu/amd: Convert iommu initialization to state machine')
Signed-off-by: Kevin Mitchell <kevmitch@arista.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/amd_iommu_init.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 9bb8d64b6f94..c113e46fdc3a 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -383,6 +383,9 @@ static void iommu_enable(struct amd_iommu *iommu)
static void iommu_disable(struct amd_iommu *iommu)
{
+ if (!iommu->mmio_base)
+ return;
+
/* Disable command buffer */
iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
--
2.20.1
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next prev parent reply other threads:[~2020-01-16 17:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200116173641.22137-1-sashal@kernel.org>
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 127/251] iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 148/251] iommu: Use right function to get group for device Sasha Levin
2020-01-16 17:35 ` Sasha Levin [this message]
2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 202/251] iommu/amd: Wait for completion of IOTLB flush in attach_device Sasha Levin
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