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authorSimon Derr <simon.derr@bull.net>2013-06-21 15:32:34 +0200
committerEric Van Hensbergen <ericvh@gmail.com>2013-07-07 22:02:26 -0500
commitea071aa1365eaf8a79b33bd8699cb0811dcddf34 (patch)
treec948ded09d3e1b10bf75abde352b50b13f2581a2
parentd9a738597faf7cd2edeec82ce8fd81969fed8390 (diff)
downloadlinux-ea071aa1365eaf8a79b33bd8699cb0811dcddf34.tar.bz2
9P: Fix fcall allocation for rdma
The current code assumes that when a request in the request array does have a tc, it also has a rc. This is normally true, but not always : when using RDMA, req->rc will temporarily be set to NULL after the request has been sent. That is usually OK though, as when the reply arrives, req->rc will be reassigned to a sane value before the request is recycled. But there is a catch : if the request is flushed, the reply will never arrive, and req->rc will be NULL, but not req->tc. This patch fixes p9_tag_alloc to take this into account. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--net/9p/client.c39
1 files changed, 23 insertions, 16 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index 01f1779eba80..5828769d1f3d 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -258,27 +258,25 @@ p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
req = &c->reqs[row][col];
if (!req->tc) {
req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
- if (!req->wq) {
- pr_err("Couldn't grow tag array\n");
- return ERR_PTR(-ENOMEM);
- }
+ if (!req->wq)
+ goto grow_failed;
+
init_waitqueue_head(req->wq);
req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
GFP_NOFS);
+ if (!req->tc)
+ goto grow_failed;
+
+ req->tc->capacity = alloc_msize;
+ req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
+ }
+ if (!req->rc) {
req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
GFP_NOFS);
- if ((!req->tc) || (!req->rc)) {
- pr_err("Couldn't grow tag array\n");
- kfree(req->tc);
- kfree(req->rc);
- kfree(req->wq);
- req->tc = req->rc = NULL;
- req->wq = NULL;
- return ERR_PTR(-ENOMEM);
- }
- req->tc->capacity = alloc_msize;
+ if (!req->rc)
+ goto grow_failed;
+
req->rc->capacity = alloc_msize;
- req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
}
@@ -288,7 +286,16 @@ p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
req->tc->tag = tag-1;
req->status = REQ_STATUS_ALLOC;
- return &c->reqs[row][col];
+ return req;
+
+grow_failed:
+ pr_err("Couldn't grow tag array\n");
+ kfree(req->tc);
+ kfree(req->rc);
+ kfree(req->wq);
+ req->tc = req->rc = NULL;
+ req->wq = NULL;
+ return ERR_PTR(-ENOMEM);
}
/**