fs/drivers: Avoid causing a busy loop in the program due to context switching induced by sem_post.

examples:
There are two threads involved: thread A with a priority of 100 and
thread B with a priority of 101. Here's how they interact:

When thread A releases a semaphore, thread B is scheduled to execute
some code and may reacquire the semaphore. If no other tasks are ready,
thread A will be scheduled to run.
This continuous process can lead to a busy loop.

Thread A:                                                   Thread B:

while (nxsem_get_value(&priv->wait, &semcount) >= 0 &&  <---
       semcount <= 0)                                      |  2)context switch
  {                                  1)contex switch       |
    nxsem_post(&priv->wait);         ------------->     run some code and nxsem_wait again
  }

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>

drivers/i2c/i2c_slave_driver.c

@@ -506,9 +506,12 @@ static int i2c_slave_callback(FAR void *arg, i2c_slave_complete_t status,
       priv->read_index = 0;
       priv->read_length = length;
 
-      while (nxsem_get_value(&priv->wait, &semcount) >= 0 && semcount <= 0)
+      if (nxsem_get_value(&priv->wait, &semcount) >= 0)
         {
-          nxsem_post(&priv->wait);
+          while (semcount++ <= 0)
+            {
+              nxsem_post(&priv->wait);
+            }
         }
     }
   else

drivers/ipcc/ipcc_read.c

@@ -92,9 +92,12 @@ void ipcc_rxfree_notify(FAR struct ipcc_driver_s *priv)
 
   /* Notify all blocked readers that data is available to read */
 
-  while (nxsem_get_value(&priv->rxsem, &semval) >= 0 && semval <= 0)
+  if (nxsem_get_value(&priv->rxsem, &semval) >= 0)
     {
-      nxsem_post(&priv->rxsem);
+      while (semval++ <= 0)
+        {
+          nxsem_post(&priv->rxsem);
+        }
     }
 }
 

drivers/ipcc/ipcc_write.c

@@ -92,9 +92,12 @@ void ipcc_txfree_notify(FAR struct ipcc_driver_s *priv)
 
   /* Notify all blocked writers that data is available to write */
 
-  while (nxsem_get_value(&priv->txsem, &semval) >= 0 && semval <= 0)
+  if (nxsem_get_value(&priv->txsem, &semval) >= 0)
     {
-      nxsem_post(&priv->txsem);
+      while (semval++ <= 0)
+        {
+          nxsem_post(&priv->txsem);
+        }
     }
 }
 

drivers/misc/goldfish_pipe.c

@@ -537,9 +537,12 @@ static void goldfish_pipe_wake(FAR struct goldfish_pipe_s *pipe,
   FAR sem_t *sem = is_write ? &pipe->wait_for_write : &pipe->wait_for_read;
   int sval;
 
-  while (nxsem_get_value(sem, &sval) >= 0 && sval <= 0)
+  if (nxsem_get_value(sem, &sval) >= 0)
     {
-      nxsem_post(sem);
+      while (sval++ <= 0)
+        {
+          nxsem_post(sem);
+        }
     }
 }
 

drivers/pipes/pipe_common.c

@@ -76,9 +76,12 @@ static void pipecommon_wakeup(FAR sem_t *sem)
 {
   int sval;
 
-  while (nxsem_get_value(sem, &sval) == OK && sval <= 0)
+  if (nxsem_get_value(sem, &sval) >= 0)
     {
-      nxsem_post(sem);
+      while (sval++ <= 0)
+        {
+          nxsem_post(sem);
+        }
     }
 }
 

drivers/spi/spi_slave_driver.c

@@ -742,9 +742,12 @@ static void spi_slave_notify(FAR struct spi_slave_dev_s *dev,
       poll_notify(&priv->fds, 1, POLLERR);
     }
 
-  while (nxsem_get_value(&priv->wait, &semcnt) == 0 && semcnt <= 0)
+  if (nxsem_get_value(&priv->wait, &semcnt) >= 0)
     {
-      nxsem_post(&priv->wait);
+      while (semcnt++ <= 0)
+        {
+          nxsem_post(&priv->wait);
+        }
     }
 }
 

drivers/wireless/bluetooth/bt_slip.c

@@ -561,10 +561,12 @@ static void bt_slip_unack_handle(FAR struct sliphci_s *priv)
         {
           int semcount;
 
-          while (nxsem_get_value(&priv->sem, &semcount) >= 0 &&
-                 semcount <= 0)
+          if (nxsem_get_value(&priv->sem, &semcount) >= 0)
             {
-              nxsem_post(&priv->sem);
+              while (semcount++ <= 0)
+                {
+                  nxsem_post(&priv->sem);
+                }
             }
         }
 

fs/notify/inotify.c

@@ -289,9 +289,12 @@ static void inotify_queue_event(FAR struct inotify_device_s *dev, int wd,
 
   poll_notify(dev->fds, CONFIG_FS_NOTIFY_FD_POLLWAITERS, POLLIN);
 
-  while (nxsem_get_value(&dev->sem, &semcnt) == 0 && semcnt <= 1)
+  if (nxsem_get_value(&dev->sem, &semcnt) >= 0)
     {
-      nxsem_post(&dev->sem);
+      while (semcnt++ <= 1)
+        {
+          nxsem_post(&dev->sem);
+        }
     }
 }