This is a note to let you know that I've just added the patch titled

vfio/spapr: Fix missing mutex unlock when creating a window

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: vfio-spapr-fix-missing-mutex-unlock-when-creating-a-window.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Dec 6 17:39:55 CET 2017

From: Alexey Kardashevskiy aik@ozlabs.ru Date: Wed, 1 Feb 2017 14:26:16 +1100 Subject: vfio/spapr: Fix missing mutex unlock when creating a window

From: Alexey Kardashevskiy aik@ozlabs.ru

[ Upstream commit 2da64d20a0b20046d688e44f4033efd09157e29d ]

Commit d9c728949ddc ("vfio/spapr: Postpone default window creation") added an additional exit to the VFIO_IOMMU_SPAPR_TCE_CREATE case and made it possible to return from tce_iommu_ioctl() without unlocking container->lock; this fixes the issue.

Fixes: d9c728949ddc ("vfio/spapr: Postpone default window creation") Signed-off-by: Alexey Kardashevskiy aik@ozlabs.ru Reviewed-by: David Gibson david@gibson.dropbear.id.au Signed-off-by: Alex Williamson alex.williamson@redhat.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/vfio/vfio_iommu_spapr_tce.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -1123,12 +1123,11 @@ static long tce_iommu_ioctl(void *iommu_ mutex_lock(&container->lock);

ret = tce_iommu_create_default_window(container); - if (ret) - return ret; - - ret = tce_iommu_create_window(container, create.page_shift, - create.window_size, create.levels, - &create.start_addr); + if (!ret) + ret = tce_iommu_create_window(container, + create.page_shift, + create.window_size, create.levels, + &create.start_addr);

mutex_unlock(&container->lock);

Patches currently in stable-queue which might be from aik@ozlabs.ru are

queue-4.9/vfio-spapr-fix-missing-mutex-unlock-when-creating-a-window.patch