This is a note to let you know that I've just added the patch titled
iommu/exynos: Suppress unbinding to prevent system failure
to the 4.4-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-exynos-suppress-unbinding-to-prevent-system-failure.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b54b874fbaf5e024723e50dfb035a9916d6752b4 Mon Sep 17 00:00:00 2001
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Date: Fri, 20 May 2016 15:48:21 +0200
Subject: iommu/exynos: Suppress unbinding to prevent system failure
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
commit b54b874fbaf5e024723e50dfb035a9916d6752b4 upstream.
Removal of IOMMU driver cannot be done reliably, so Exynos IOMMU driver
doesn't support this operation. It is essential for system operation, so
it makes sense to prevent unbinding by disabling bind/unbind sysfs
feature for SYSMMU controller driver to avoid kernel ops or trashing
memory caused by such operation.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/exynos-iommu.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -647,6 +647,7 @@ static struct platform_driver exynos_sys
.name = "exynos-sysmmu",
.of_match_table = sysmmu_of_match,
.pm = &sysmmu_pm_ops,
+ .suppress_bind_attrs = true,
}
};
Patches currently in stable-queue which might be from m.szyprowski@xxxxxxxxxxx are
queue-4.4/s5p-mfc-set-device-name-for-reserved-memory-region-devs.patch
queue-4.4/s5p-mfc-add-release-callback-for-memory-region-devs.patch
queue-4.4/iommu-exynos-suppress-unbinding-to-prevent-system-failure.patch
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