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agp/intel-gtt: Don't leak the scratch page

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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
This commit is contained in:
Daniel Vetter 2016-01-27 14:37:58 +01:00
parent 06e6ff8f10
commit 9f5ac8ed40
1 changed files with 6 additions and 2 deletions
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8
drivers/char/agp/intel-gtt.c
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@ -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)