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| author | Dominique Martinet <dominique.martinet@cea.fr> | 2014-01-17 18:31:00 +0100 |
|---|---|---|
| committer | Eric Van Hensbergen <ericvh@gmail.com> | 2014-03-25 22:37:59 +0100 |
| commit | 2b6e72ed747f68a038df616efd86744b3644d694 (patch) | |
| tree | d781427484432608a74ccc44fd4a7a3296751f23 /include/net/9p | |
| parent | Linus 3.14-rc1 (diff) | |
| download | linux-2b6e72ed747f68a038df616efd86744b3644d694.tar.xz linux-2b6e72ed747f68a038df616efd86744b3644d694.zip | |
9P: Add memory barriers to protect request fields over cb/rpc threads handoff
We need barriers to guarantee this pattern works as intended:
[w] req->rc, 1 [r] req->status, 1
wmb rmb
[w] req->status, 1 [r] req->rc
Where the wmb ensures that rc gets written before status,
and the rmb ensures that if you observe status == 1, rc is the new value.
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'include/net/9p')
| -rw-r--r-- | include/net/9p/client.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/9p/client.h b/include/net/9p/client.h index c38a005bd0cf..115aeac401b1 100644 --- a/include/net/9p/client.h +++ b/include/net/9p/client.h @@ -261,7 +261,7 @@ int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status); int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *fl); struct p9_req_t *p9_tag_lookup(struct p9_client *, u16); -void p9_client_cb(struct p9_client *c, struct p9_req_t *req); +void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status); int p9_parse_header(struct p9_fcall *, int32_t *, int8_t *, int16_t *, int); int p9stat_read(struct p9_client *, char *, int, struct p9_wstat *); |