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| author |   Jason Gunthorpe <jgg@mellanox.com> | 2020-01-08 20:05:33 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2020-01-16 15:55:45 -0400 |
| commit | da57db25677f8566a354b0d0e4973a0fdcabcf84 (patch) | |
| tree | fb92069dc515e2f813156a3ed8d2a2046c13c95c /drivers/infiniband/core/rdma_core.c | |
| parent | RDMA/core: Add UVERBS_METHOD_ASYNC_EVENT_ALLOC (diff) | |
| download | linux-dev-da57db25677f8566a354b0d0e4973a0fdcabcf84.tar.xz linux-dev-da57db25677f8566a354b0d0e4973a0fdcabcf84.zip | |
RDMA/core: Remove ucontext_lock from the uverbs_destry_ufile_hw() path
This lock only serializes ucontext creation. Instead of checking the
ucontext_lock during destruction hold the existing hw_destroy_rwsem during
creation, which is the standard pattern for object creation.
The simplification of locking is needed for the next patch.
Link: https://lore.kernel.org/r/1578506740-22188-4-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 'drivers/infiniband/core/rdma_core.c')
| -rw-r--r-- | drivers/infiniband/core/rdma_core.c | 21 |
1 files changed, 1 insertions, 20 deletions
diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c index 50251da123f7..5128cb16bb48 100644 --- a/drivers/infiniband/core/rdma_core.c +++ b/drivers/infiniband/core/rdma_core.c @@ -845,9 +845,7 @@ static int __uverbs_cleanup_ufile(struct ib_uverbs_file *ufile, } /* - * Destroy the uncontext and every uobject associated with it. If called with - * reason != RDMA_REMOVE_CLOSE this will not return until the destruction has - * been completed and ufile->ucontext is NULL. + * Destroy the uncontext and every uobject associated with it. * * This is internally locked and can be called in parallel from multiple * contexts. @@ -855,22 +853,6 @@ static int __uverbs_cleanup_ufile(struct ib_uverbs_file *ufile, void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile, enum rdma_remove_reason reason) { - if (reason == RDMA_REMOVE_CLOSE) { - /* - * During destruction we might trigger something that - * synchronously calls release on any file descriptor. For - * this reason all paths that come from file_operations - * release must use try_lock. They can progress knowing that - * there is an ongoing uverbs_destroy_ufile_hw that will clean - * up the driver resources. - */ - if (!mutex_trylock(&ufile->ucontext_lock)) - return; - - } else { - mutex_lock(&ufile->ucontext_lock); - } - down_write(&ufile->hw_destroy_rwsem); /* @@ -899,7 +881,6 @@ void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile, done: up_write(&ufile->hw_destroy_rwsem); - mutex_unlock(&ufile->ucontext_lock); } const struct uverbs_obj_type_class uverbs_fd_class = { |