On Mon, May 14, 2018 at 01:34:27PM +0300, Dmitry Osipenko wrote:
On 14.05.2018 13:13, Thierry Reding wrote:
From: Thierry Reding treding@nvidia.com
The IOVA API uses a memory cache to allocate IOVA nodes from. To make sure that this cache is available, obtain a reference to it and release the reference when the cache is no longer needed.
On 64-bit ARM this is hidden by the fact that the DMA mapping API gets that reference and never releases it. On 32-bit ARM, this is papered over by the Tegra DRM driver (the sole user of the host1x API requiring the cache) acquiring a reference to the IOVA cache for its own purposes. However, there may be additional users of this API in the future, so fix this upfront to avoid surprises.
Fixes: 404bfb78daf3 ("gpu: host1x: Add IOMMU support") Signed-off-by: Thierry Reding treding@nvidia.com
drivers/gpu/host1x/dev.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
Applied, thanks.
Thierry