git commit 82568565683b4991964a5fc89a9ca0c7122818e8 adds a dummy page so that if something goes wrong it will at least fetch/write data _only_ to this location.
The radeon_gart_init sets it up.. but there is no corresponding free-ing of this dummy page. There is one invocation to free-ing the dummy page in r600.c but nothing in the radeon_gart_fini path.
This patch adds in the unloading/unbind path the free-ing of said dummy page.
Without this patch and if we have CONFIG_DMA_API_DEBUG=y set we get this:
[ 22.113420] drm: unregistered panic notifier [ 22.126500] [drm] radeon: finishing device. [ 22.130868] [drm] radeon: cp finalized [ 22.135384] [TTM] Finalizing pool allocator. [ 22.139669] [TTM] Zone kernel: Used memory at exit: 0 kiB. [ 22.145229] [drm] radeon: ttm finalized [ 22.149055] vga_switcheroo: disabled [ 22.153393] ------------[ cut here ]------------ [ 22.158021] WARNING: at /home/konrad/ssd/linux/lib/dma-debug.c:689 dma_debug_device_change+0x12e/0x161() [ 22.167475] Hardware name: PowerEdge T105 [ 22.171562] pci 0000:01:08.0: DMA-API: device driver has pending DMA allocations while released from device [count=1]
With this patch we don't see this anymore.
Signed-off-by: Konrad Rzeszutek Wilk konrad.wilk@oracle.com --- drivers/gpu/drm/radeon/radeon_gart.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c index 6501611..dc04c7b 100644 --- a/drivers/gpu/drm/radeon/radeon_gart.c +++ b/drivers/gpu/drm/radeon/radeon_gart.c @@ -269,4 +269,6 @@ void radeon_gart_fini(struct radeon_device *rdev) kfree(rdev->gart.pages_addr); rdev->gart.pages = NULL; rdev->gart.pages_addr = NULL; + + radeon_dummy_page_fini(rdev); }