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authorDaniel Vetter <daniel.vetter@ffwll.ch>2016-01-27 16:37:58 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-02-10 10:52:08 +0300
commit9f5ac8ed4013c616bd3b29147808c8b2f057c251 (patch)
treef6728c67af45056a7a0dc10a5b4def2a2efe35a3 /drivers/char
parent06e6ff8f10513ae863adeddf21510c99171a6283 (diff)
downloadlinux-9f5ac8ed4013c616bd3b29147808c8b2f057c251.tar.xz
agp/intel-gtt: Don't leak the scratch page
Recently discovered by enabling CONFIG_DMA_API_DEBUG in our CI. By the looks of it broken since forever. v2: Don't forget to set the scratch page back to wb (Chris). Reuse intel_gtt_teardown_scratch_page for that (and fix it up to treat needs_dmar y/n correctly). Cc: Chris Wilson <chris@chris-wilson.co.uk> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93793 Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1453901881-26425-1-git-send-email-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/agp/intel-gtt.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 1341a94cc779..e657f989745e 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -555,8 +555,10 @@ static unsigned int intel_gtt_mappable_entries(void)
static void intel_gtt_teardown_scratch_page(void)
{
set_pages_wb(intel_private.scratch_page, 1);
- pci_unmap_page(intel_private.pcidev, intel_private.scratch_page_dma,
- PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+ if (intel_private.needs_dmar)
+ pci_unmap_page(intel_private.pcidev,
+ intel_private.scratch_page_dma,
+ PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
__free_page(intel_private.scratch_page);
}
@@ -1430,6 +1432,8 @@ void intel_gmch_remove(void)
if (--intel_private.refcount)
return;
+ if (intel_private.scratch_page)
+ intel_gtt_teardown_scratch_page();
if (intel_private.pcidev)
pci_dev_put(intel_private.pcidev);
if (intel_private.bridge_dev)