[incubator-nuttx] 01/02: rptun: fix rptun sem post too much

[xi...@apache.org]

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xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git

commit f599527e1e6de92e24313c554fc33a912440fb47
Author: ligd <li...@xiaomi.com>
AuthorDate: Fri Nov 4 11:44:25 2022 +0800

    rptun: fix rptun sem post too much
    
    _assert
    /media/liangchaozhong/ssd/86v1ap/nuttx/libs/libc/assert/lib_assert.c:36
    nxsem_post
    /media/liangchaozhong/ssd/86v1ap/nuttx/sched/semaphore/sem_post.c:91 (discriminator 1)
    rptun_wakeup_rx
    /media/liangchaozhong/ssd/86v1ap/nuttx/drivers/rptun/rptun.c:374
    rpmsg_virtio_rx_callback
    /media/liangchaozhong/ssd/86v1ap/nuttx/openamp/open-amp/lib/rpmsg/rpmsg_virtio.c:377
    rproc_virtio_notified
    /media/liangchaozhong/ssd/86v1ap/nuttx/openamp/open-amp/lib/remoteproc/remoteproc_virtio.c:342
    remoteproc_get_notification
    /media/liangchaozhong/ssd/86v1ap/nuttx/openamp/open-amp/lib/remoteproc/remoteproc.c:998
    nxtask_start
    /media/liangchaozhong/ssd/86v1ap/nuttx/sched/task/task_start.c:129
    
    Signed-off-by: ligd <li...@xiaomi.com>
---
 drivers/rptun/rptun.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/rptun/rptun.c b/drivers/rptun/rptun.c
index 5c5208c6e2..8cdbc92109 100644
--- a/drivers/rptun/rptun.c
+++ b/drivers/rptun/rptun.c
@@ -292,7 +292,13 @@ static int rptun_thread(int argc, FAR char *argv[])
 
 static void rptun_wakeup_rx(FAR struct rptun_priv_s *priv)
 {
-  nxsem_post(&priv->semrx);
+  int semcount;
+
+  nxsem_get_value(&priv->semrx, &semcount);
+  if (semcount < 1)
+    {
+      nxsem_post(&priv->semrx);
+    }
 }
 
 static bool rptun_is_recursive(FAR struct rptun_priv_s *priv)