[PATCH 1/1] P2P: Avoid resetting pending_listen_freq, if p2p_listen is pending

Jithu Jance jithujance at gmail.com
Mon May 19 08:34:15 EDT 2014


Hi Jouni,

>This seems to be causing failures in hwsim test cases. I'm not
>completely sure why, but the logs seems to imply that this case is hit
>and the P2P state machine is then stuck in waiting for something that
>never happens. It looks like this can happen at least when P2P_LISTEN is
>issued while a p2p_scan from a previously started P2P_FIND is in
>progress.

I ran hwsim and fixed a case where the listen was getting stuck (the
p2p_find case that you mentioned). Please
find the revised patch below. But when I run the hwsim there were other
failures which seems to occur with or without this patch.
I couldn't figure out the cause of the failure as the group formation seems
to succeed, but the result shows as failed. :(

Signed-off-by: Jithu Jance <jithu at broadcom.com>
---
 src/p2p/p2p.c |   28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/src/p2p/p2p.c b/src/p2p/p2p.c
index c2f8d9b..7b2d43b 100644
--- a/src/p2p/p2p.c
+++ b/src/p2p/p2p.c
@@ -238,6 +238,12 @@ static void p2p_listen_in_find(struct p2p_data *p2p,
int dev_disc)
  p2p_dbg(p2p, "Starting short listen state (state=%s)",
  p2p_state_txt(p2p->state));

+ if (p2p->pending_listen_freq) {
+ /* We have a pending p2p_listen request */
+ p2p_dbg(p2p, "p2p_listen command pending already");
+ return;
+ }
+
  freq = p2p_channel_to_freq(p2p->cfg->reg_class, p2p->cfg->channel);
  if (freq < 0) {
  p2p_dbg(p2p, "Unknown regulatory class/channel");
@@ -260,14 +266,14 @@ static void p2p_listen_in_find(struct p2p_data *p2p,
int dev_disc)
  return;
  }

- p2p->pending_listen_freq = freq;
- p2p->pending_listen_sec = 0;
- p2p->pending_listen_usec = 1024 * tu;
-
  ies = p2p_build_probe_resp_ies(p2p);
  if (ies == NULL)
  return;

+ p2p->pending_listen_freq = freq;
+ p2p->pending_listen_sec = 0;
+ p2p->pending_listen_usec = 1024 * tu;
+
  if (p2p->cfg->start_listen(p2p->cfg->cb_ctx, freq, 1024 * tu / 1000,
     ies) < 0) {
  p2p_dbg(p2p, "Failed to start listen mode");
@@ -284,16 +290,18 @@ int p2p_listen(struct p2p_data *p2p, unsigned int
timeout)

  p2p_dbg(p2p, "Going to listen(only) state");

+ if (p2p->pending_listen_freq) {
+ /* We have a pending p2p_listen request */
+ p2p_dbg(p2p, "p2p_listen command pending already");
+ return -1;
+ }
+
  freq = p2p_channel_to_freq(p2p->cfg->reg_class, p2p->cfg->channel);
  if (freq < 0) {
  p2p_dbg(p2p, "Unknown regulatory class/channel");
  return -1;
  }

- p2p->pending_listen_freq = freq;
- p2p->pending_listen_sec = timeout / 1000;
- p2p->pending_listen_usec = (timeout % 1000) * 1000;
-
  if (p2p->p2p_scan_running) {
  if (p2p->start_after_scan == P2P_AFTER_SCAN_CONNECT) {
  p2p_dbg(p2p, "p2p_scan running - connect is already pending - skip
listen");
@@ -308,6 +316,10 @@ int p2p_listen(struct p2p_data *p2p, unsigned int
timeout)
  if (ies == NULL)
  return -1;

+ p2p->pending_listen_freq = freq;
+ p2p->pending_listen_sec = timeout / 1000;
+ p2p->pending_listen_usec = (timeout % 1000) * 1000;
+
  if (p2p->cfg->start_listen(p2p->cfg->cb_ctx, freq, timeout, ies) < 0) {
  p2p_dbg(p2p, "Failed to start listen mode");
  p2p->pending_listen_freq = 0;
--
1.7.9.5





*> Jithu Jance*





On Mon, May 12, 2014 at 1:19 AM, Jouni Malinen <j at w1.fi> wrote:

> On Wed, May 07, 2014 at 02:02:06PM +0530, Jithu Jance wrote:
> > If p2p_listen is called while previous listen command's
> > remain_on_channel event is pending, the p2p_listen would fail
> > and it used to clear pending_listen_freq. Now when the remain-
> > on-channel event comes from the driver, the pending_listen_freq
> > doesn't match and gets ignored. This was leading to a case
> > where listen state was getting stuck (in case of WAIT_PEER_CONNECT
> > state).
>
> > diff --git a/src/p2p/p2p.c b/src/p2p/p2p.c
> > @@ -284,6 +284,12 @@ int p2p_listen(struct p2p_data *p2p, unsigned int
> timeout)
> >       p2p_dbg(p2p, "Going to listen(only) state");
> >
> > +     if (p2p->pending_listen_freq) {
> > +             /* We have a pending p2p_listen request */
> > +             p2p_dbg(p2p, "p2p_listen command pending already");
> > +             return -1;
> > +     }
>
> This seems to be causing failures in hwsim test cases. I'm not
> completely sure why, but the logs seems to imply that this case is hit
> and the P2P state machine is then stuck in waiting for something that
> never happens. It looks like this can happen at least when P2P_LISTEN is
> issued while a p2p_scan from a previously started P2P_FIND is in
> progress.
>
> --
> Jouni Malinen                                            PGP id EFC895FA
> _______________________________________________
> HostAP mailing list
> HostAP at lists.shmoo.com
> http://lists.shmoo.com/mailman/listinfo/hostap
>
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