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RDMA/odp: Fix missed unlock in non-blocking invalidate_start 

If invalidate_start returns with EAGAIN then the umem_rwsem needs to be
unlocked as no invalidate_end will be called.

Cc: <stable@vger.kernel.org>
Fixes: ca748c39ea ("RDMA/umem: Get rid of per_mm->notifier_count")
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Jason Gunthorpe 2019-06-11 13:09:51 -03:00 committed by Doug Ledford
parent 5a3113d19c
commit 7608bf40cf
1 changed files with 9 additions and 5 deletions
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14
drivers/infiniband/core/umem_odp.c
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@ -149,6 +149,7 @@ static int ib_umem_notifier_invalidate_range_start(struct mmu_notifier *mn,
{
struct ib_ucontext_per_mm *per_mm =
container_of(mn, struct ib_ucontext_per_mm, mn);
int rc;
if (mmu_notifier_range_blockable(range))
down_read(&per_mm->umem_rwsem);
@ -165,11 +166,14 @@ static int ib_umem_notifier_invalidate_range_start(struct mmu_notifier *mn,
return 0;
}
return rbt_ib_umem_for_each_in_range(&per_mm->umem_tree, range->start,
range->end,
invalidate_range_start_trampoline,
mmu_notifier_range_blockable(range),
NULL);
rc = rbt_ib_umem_for_each_in_range(&per_mm->umem_tree, range->start,
range->end,
invalidate_range_start_trampoline,
mmu_notifier_range_blockable(range),
NULL);
if (rc)
up_read(&per_mm->umem_rwsem);
return rc;
}
static int invalidate_range_end_trampoline(struct ib_umem_odp *item, u64 start,