IB/umem: Use the correct mm during ib_umem_release

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User-space may invoke ibv_reg_mr and ibv_dereg_mr in different threads.

If ibv_dereg_mr is called after the thread which invoked ibv_reg_mr has
exited, get_pid_task will return NULL and ib_umem_release will not
decrease mm->pinned_vm.

Instead of using threads to locate the mm, use the overall tgid from the
ib_ucontext struct instead. This matches the behavior of ODP and
disassociate in handling the mm of the process that called ibv_reg_mr.

Cc: <stable@vger.kernel.org>
Fixes: 87773dd56d ("IB: ib_umem_release() should decrement mm->pinned_vm from ib_umem_get")
Signed-off-by: Lidong Chen <lidongchen@tencent.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

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This commit is contained in:

Lidong Chen 2018-05-08 16:50:16 +08:00 • committed by Jason Gunthorpe

parent 3d69191086

commit 8e907ed488

2 changed files with 1 additions and 7 deletions

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7

drivers/infiniband/core/umem.c

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1

include/rdma/ib_umem.h

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