Cancellation points: Close up some logic to eliminte some race conditions.

fs/vfs/fs_close.c

@@ -88,7 +88,7 @@ int close(int fd)
 
   /* close() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
 #if CONFIG_NFILE_DESCRIPTORS > 0
   /* Did we get a valid file descriptor? */

fs/vfs/fs_fcntl.c

@@ -223,7 +223,7 @@ int fcntl(int fd, int cmd, ...)
 
   /* fcntl() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* Setup to access the variable argument list */
 

fs/vfs/fs_fsync.c

@@ -122,7 +122,7 @@ int fsync(int fd)
 
   /* fsync() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* Get the file structure corresponding to the file descriptor. */
 

fs/vfs/fs_open.c

@@ -105,7 +105,7 @@ int open(const char *path, int oflags, ...)
 
   /* open() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* If the file is opened for creation, then get the mode bits */
 

fs/vfs/fs_poll.c

@@ -368,7 +368,7 @@ int poll(FAR struct pollfd *fds, nfds_t nfds, int timeout)
 
   /* poll() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* This semaphore is used for signaling and, hence, should not have
    * priority inheritance enabled.

fs/vfs/fs_pread.c

@@ -145,7 +145,7 @@ ssize_t pread(int fd, FAR void *buf, size_t nbytes, off_t offset)
 
   /* pread() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* Get the file structure corresponding to the file descriptor. */
 

fs/vfs/fs_pwrite.c

@@ -143,7 +143,7 @@ ssize_t pwrite(int fd, FAR const void *buf, size_t nbytes, off_t offset)
 
   /* pread() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* Get the file structure corresponding to the file descriptor. */
 
@@ -161,6 +161,6 @@ ssize_t pwrite(int fd, FAR const void *buf, size_t nbytes, off_t offset)
       ret = file_pwrite(filep, buf, nbytes, offset);
     }
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
   return ret;
 }

fs/vfs/fs_read.c

@@ -138,7 +138,7 @@ ssize_t read(int fd, FAR void *buf, size_t nbytes)
 
   /* read() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* Did we get a valid file descriptor? */
 

fs/vfs/fs_select.c

@@ -113,7 +113,7 @@ int select(int nfds, FAR fd_set *readfds, FAR fd_set *writefds,
 
   /* select() is cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* How many pollfd structures do we need to allocate? */
 

fs/vfs/fs_write.c

@@ -166,7 +166,7 @@ ssize_t write(int fd, FAR const void *buf, size_t nbytes)
 
   /* write() is a cancellation point */
 
-  enter_cancellation_point();
+  (void)enter_cancellation_point();
 
   /* Did we get a valid file descriptor? */