Patch "iommu/exynos: Suppress unbinding to prevent system failure" has been added to the 4.4-stable tree

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 <[email protected]> know about it.

From: Marek Szyprowski <[email protected]>
Date: Fri, 20 May 2016 15:48:21 +0200
Subject: iommu/exynos: Suppress unbinding to prevent system failure

From: Marek Szyprowski <[email protected]>

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.

---
 drivers/iommu/exynos-iommu.c |    1 +
 1 file changed, 1 insertion(+)

@@ -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 [email protected] 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