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| author |   Jason Gunthorpe <jgg@mellanox.com> | 2020-01-08 19:22:06 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2020-01-13 16:20:16 -0400 |
| commit | 5c55cfd6a553d008fcd54e4a4e3fed1340ee5090 (patch) | |
| tree | 0dd95d4166c15b2bee2fbb220f9f0d5e7d12d08f /drivers/infiniband/core/uverbs_std_types_cq.c | |
| parent | RDMA/core: Make ib_uverbs_async_event_file into a uobject (diff) | |
| download | linux-dev-5c55cfd6a553d008fcd54e4a4e3fed1340ee5090.tar.xz linux-dev-5c55cfd6a553d008fcd54e4a4e3fed1340ee5090.zip | |
RDMA/core: Use READ_ONCE for ib_ufile.async_file
The writer for async_file holds the ucontext_lock, while the readers are
left unlocked. Most readers rely on an implicit locking, either by having
a uobject (which cannot be created before a context) or by holding the
ib_ufile kref.
However ib_uverbs_free_hw_resources() has no implicit lock and has a
possible race. Make this all clear and sane by using READ_ONCE
consistently.
Link: https://lore.kernel.org/r/1578504126-9400-15-git-send-email-yishaih@mellanox.com
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/core/uverbs_std_types_cq.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/infiniband/core/uverbs_std_types_cq.c b/drivers/infiniband/core/uverbs_std_types_cq.c index a41c758042cc..da4110a0eea2 100644 --- a/drivers/infiniband/core/uverbs_std_types_cq.c +++ b/drivers/infiniband/core/uverbs_std_types_cq.c @@ -49,7 +49,6 @@ static int uverbs_free_cq(struct ib_uobject *uobject, return ret; ib_uverbs_release_ucq( - attrs->ufile, ev_queue ? container_of(ev_queue, struct ib_uverbs_completion_event_file, ev_queue) : |