4.4-stable review patch. If anyone has any objections, please let me know.
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From: Suman Anna s-anna@ti.com
[ Upstream commit b7e1e6859fbf60519fd82d7120cee106a6019512 ]
The OMAP3 ISP driver manages its MMU mappings through the IOMMU-aware ARM DMA backend. The current code creates a dma_iommu_mapping and attaches this to the ISP device, but never detaches the mapping in either the probe failure paths or the driver remove path resulting in an unbalanced mapping refcount and a memory leak. Fix this properly.
Reported-by: Pavel Machek pavel@ucw.cz Signed-off-by: Suman Anna s-anna@ti.com Tested-by: Pavel Machek pavel@ucw.cz Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/platform/omap3isp/isp.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/media/platform/omap3isp/isp.c +++ b/drivers/media/platform/omap3isp/isp.c @@ -2077,6 +2077,7 @@ error_csiphy:
static void isp_detach_iommu(struct isp_device *isp) { + arm_iommu_detach_device(isp->dev); arm_iommu_release_mapping(isp->mapping); isp->mapping = NULL; iommu_group_remove_device(isp->dev); @@ -2110,8 +2111,7 @@ static int isp_attach_iommu(struct isp_d mapping = arm_iommu_create_mapping(&platform_bus_type, SZ_1G, SZ_2G); if (IS_ERR(mapping)) { dev_err(isp->dev, "failed to create ARM IOMMU mapping\n"); - ret = PTR_ERR(mapping); - goto error; + return PTR_ERR(mapping); }
isp->mapping = mapping; @@ -2126,7 +2126,8 @@ static int isp_attach_iommu(struct isp_d return 0;
error: - isp_detach_iommu(isp); + arm_iommu_release_mapping(isp->mapping); + isp->mapping = NULL; return ret; }