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authorLatchesar Ionkov <lucho@ionkov.net>2009-04-05 16:28:59 -0500
committerEric Van Hensbergen <ericvh@vTrogdor.(none)>2009-04-05 16:54:53 -0500
commit1bab88b2310998de18b32529a27ea835d164254a (patch)
treefed704a8b3b4ce93d8cd25462ccc9186dec84b7a /net/9p/trans_fd.c
parent742b11a7ec60faa25d76c95c268041ab215c25ad (diff)
downloadlinux-2.6.38-lt-ux500-1bab88b2310998de18b32529a27ea835d164254a.tar.gz
net/9p: handle correctly interrupted 9P requests
Currently the 9p code crashes when a operation is interrupted, i.e. for example when the user presses ^C while reading from a file. This patch fixes the code that is responsible for interruption and flushing of 9P operations. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Diffstat (limited to 'net/9p/trans_fd.c')
-rw-r--r--net/9p/trans_fd.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index c613ed08a5e..a2a1814c7a8 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -213,8 +213,8 @@ static void p9_conn_cancel(struct p9_conn *m, int err)
spin_unlock_irqrestore(&m->client->lock, flags);
list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
- list_del(&req->req_list);
P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req);
+ list_del(&req->req_list);
p9_client_cb(m->client, req);
}
}
@@ -336,7 +336,8 @@ static void p9_read_work(struct work_struct *work)
"mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
m->req = p9_tag_lookup(m->client, tag);
- if (!m->req) {
+ if (!m->req || (m->req->status != REQ_STATUS_SENT &&
+ m->req->status != REQ_STATUS_FLSH)) {
P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
tag);
err = -EIO;
@@ -361,10 +362,11 @@ static void p9_read_work(struct work_struct *work)
if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n");
spin_lock(&m->client->lock);
+ if (m->req->status != REQ_STATUS_ERROR)
+ m->req->status = REQ_STATUS_RCVD;
list_del(&m->req->req_list);
spin_unlock(&m->client->lock);
p9_client_cb(m->client, m->req);
-
m->rbuf = NULL;
m->rpos = 0;
m->rsize = 0;
@@ -454,6 +456,7 @@ static void p9_write_work(struct work_struct *work)
req = list_entry(m->unsent_req_list.next, struct p9_req_t,
req_list);
req->status = REQ_STATUS_SENT;
+ P9_DPRINTK(P9_DEBUG_TRANS, "move req %p\n", req);
list_move_tail(&req->req_list, &m->req_list);
m->wbuf = req->tc->sdata;
@@ -683,12 +686,13 @@ static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
P9_DPRINTK(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
spin_lock(&client->lock);
- list_del(&req->req_list);
if (req->status == REQ_STATUS_UNSENT) {
+ list_del(&req->req_list);
req->status = REQ_STATUS_FLSHD;
ret = 0;
- }
+ } else if (req->status == REQ_STATUS_SENT)
+ req->status = REQ_STATUS_FLSH;
spin_unlock(&client->lock);