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author | Oded Gabbay <oded.gabbay@amd.com> | 2014-11-10 12:21:39 +0200 |
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committer | Joerg Roedel <jroedel@suse.de> | 2014-11-12 14:58:33 +0100 |
commit | 1c51099a427dc8bfee917b2d0e53ad3fafbb930d (patch) | |
tree | a53eb05b225c532e1e0b6da9b2db6c5e15cafafb /include/linux/pci-acpi.h | |
parent | 206c5f60a3d902bc4b56dab2de3e88de5eb06108 (diff) | |
download | linux-next-1c51099a427dc8bfee917b2d0e53ad3fafbb930d.tar.gz |
iommu/amd: Fix accounting of device_state
This patch fixes a bug in the accounting of the
device_state. In the current code, the device_state was put
(decremented) too many times, which sometimes lead to the
driver getting stuck permanently in put_device_state_wait().
That happen because the device_state->count would go below
zero, which is never supposed to happen.
The root cause is that the device_state was decremented in
put_pasid_state() and put_pasid_state_wait() but also in all
the functions that call those functions. Therefore, the
device_state was decremented twice in each of these code
paths.
The fix is to decouple the device_state accounting from the
pasid_state accounting - remove the call to
put_device_state() from the put_pasid_state() and the
put_pasid_state_wait())
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/pci-acpi.h')
0 files changed, 0 insertions, 0 deletions