bluetooth: fix bt_slip_send would always block

chengkai15 · xiaoxiang781216 · commit aeb3051abaec · 2024-10-17T18:09:32.000+08:00
rootcause: semcount maybe zero when nxsem_wait_uninterruptible

Signed-off-by: chengkai &lt;chengkai@xiaomi.com&gt;
diff --git a/drivers/wireless/bluetooth/bt_slip.c b/drivers/wireless/bluetooth/bt_slip.c
@@ -558,8 +558,8 @@ static void bt_slip_unack_handle(FAR struct sliphci_s *priv)
         {
           int semcount;
 
-          nxsem_get_value(&priv->sem, &semcount);
-          if (semcount < 0)
+          while (nxsem_get_value(&priv->sem, &semcount) >= 0 &&
+                 semcount <= 0)
             {
               nxsem_post(&priv->sem);
             }

Original file line number	Diff line number	Diff line change
`@@ -558,8 +558,8 @@ static void bt_slip_unack_handle(FAR struct sliphci_s *priv)`
`558`	`558`	`{`
`559`	`559`	`int semcount;`
`560`	`560`
`561`		`- nxsem_get_value(&priv->sem, &semcount);`
`562`		`- if (semcount < 0)`
	`561`	`+ while (nxsem_get_value(&priv->sem, &semcount) >= 0 &&`
	`562`	`+ semcount <= 0)`
`563`	`563`	`{`
`564`	`564`	`nxsem_post(&priv->sem);`
`565`	`565`	`}`