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| author |   Haavard Skinnemoen <hskinnemoen@atmel.com> | 2007-11-14 16:59:27 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-11-14 18:45:39 -0800 |
| commit | 348badf1e825323c419dd118f65783db0f7d2ec8 (patch) | |
| tree | 126cddb26c14233eaff8ddd6a240fe4ac69204ee /include/linux | |
| parent | drivers/misc: Move misplaced pci_dev_put's (diff) | |
| download | linux-dev-348badf1e825323c419dd118f65783db0f7d2ec8.tar.xz linux-dev-348badf1e825323c419dd118f65783db0f7d2ec8.zip | |
dmaengine: fix broken device refcounting
When a DMA device is unregistered, its reference count is decremented twice
for each channel: Once dma_class_dev_release() and once in
dma_chan_cleanup(). This may result in the DMA device driver's remove()
function completing before all channels have been cleaned up, causing lots
of use-after-free fun.
Fix it by incrementing the device's reference count twice for each
channel during registration.
[dan.j.williams@intel.com: kill unnecessary client refcounting]
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions