drm/amdkfd: unbind only existing processes

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commit 121b78e679 upstream.

When unbinding a process from a device (initiated by amd_iommu_v2), the
driver needs to make sure that process still exists in the process table.
There is a possibility that amdkfd's own notifier handler -
kfd_process_notifier_release() - was called before the unbind function
and it already removed the process from the process table.

v2:
Because there can be only one process with the specified pasid, and
because *p can't be NULL inside the hash_for_each_rcu macro, it is more
reasonable to just put the whole code inside the if statement that
compares the pasid value. That way, when we exit hash_for_each_rcu, we
simply exit the function as well.

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Oded Gabbay 2016-05-26 08:41:08 +03:00 • committed by Greg Kroah-Hartman

parent ca8a32b217

commit cf2e806130

1 changed files with 35 additions and 25 deletions

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drivers/gpu/drm/amd/amdkfd/kfd_process.c

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