strparser: Use delayed work instead of timer for msg timeout

Sock lock may be taken in the message timer function which is a
problem since timers run in BH. Instead of timers use delayed_work.

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Fixes: bbb03029a899 ("strparser: Generalize strparser")
Signed-off-by: Tom Herbert <tom@quantonium.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/strparser.h b/include/net/strparser.h
index 7dc131d..d96b59f 100644 (file)
--- a/include/net/strparser.h
+++ b/include/net/strparser.h
@@ -74,10 +74,9 @@ struct strparser {
        u32 unrecov_intr : 1;
 
        struct sk_buff **skb_nextp;
-       struct timer_list msg_timer;
        struct sk_buff *skb_head;
        unsigned int need_bytes;
-       struct delayed_work delayed_work;
+       struct delayed_work msg_timer_work;
        struct work_struct work;
        struct strp_stats stats;
        struct strp_callbacks cb;

diff --git a/net/strparser/strparser.c b/net/strparser/strparser.c
index d4ea46a..c5fda15 100644 (file)
--- a/net/strparser/strparser.c
+++ b/net/strparser/strparser.c
@@ -49,7 +49,7 @@ static void strp_abort_strp(struct strparser *strp, int err)
 {
        /* Unrecoverable error in receive */
 
-       del_timer(&strp->msg_timer);
+       cancel_delayed_work(&strp->msg_timer_work);
 
        if (strp->stopped)
                return;
@@ -68,7 +68,7 @@ static void strp_abort_strp(struct strparser *strp, int err)
 static void strp_start_timer(struct strparser *strp, long timeo)
 {
        if (timeo)
-               mod_timer(&strp->msg_timer, timeo);
+               mod_delayed_work(strp_wq, &strp->msg_timer_work, timeo);
 }
 
 /* Lower lock held */
@@ -319,7 +319,7 @@ static int __strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
                eaten += (cand_len - extra);
 
                /* Hurray, we have a new message! */
-               del_timer(&strp->msg_timer);
+               cancel_delayed_work(&strp->msg_timer_work);
                strp->skb_head = NULL;
                STRP_STATS_INCR(strp->stats.msgs);
 
@@ -450,9 +450,10 @@ static void strp_work(struct work_struct *w)
        do_strp_work(container_of(w, struct strparser, work));
 }
 
-static void strp_msg_timeout(unsigned long arg)
+static void strp_msg_timeout(struct work_struct *w)
 {
-       struct strparser *strp = (struct strparser *)arg;
+       struct strparser *strp = container_of(w, struct strparser,
+                                             msg_timer_work.work);
 
        /* Message assembly timed out */
        STRP_STATS_INCR(strp->stats.msg_timeouts);
@@ -505,9 +506,7 @@ int strp_init(struct strparser *strp, struct sock *sk,
        strp->cb.read_sock_done = cb->read_sock_done ? : default_read_sock_done;
        strp->cb.abort_parser = cb->abort_parser ? : strp_abort_strp;
 
-       setup_timer(&strp->msg_timer, strp_msg_timeout,
-                   (unsigned long)strp);
-
+       INIT_DELAYED_WORK(&strp->msg_timer_work, strp_msg_timeout);
        INIT_WORK(&strp->work, strp_work);
 
        return 0;
@@ -532,7 +531,7 @@ void strp_done(struct strparser *strp)
 {
        WARN_ON(!strp->stopped);
 
-       del_timer_sync(&strp->msg_timer);
+       cancel_delayed_work_sync(&strp->msg_timer_work);
        cancel_work_sync(&strp->work);
 
        if (strp->skb_head) {