Remove BUG_ON from n_tty_read()

Change the BUG_ON to WARN_ON and return in case of tty->read_buf==NULL. We want to track a
couple of long standing reports of this but at the same time we can avoid killing the box.

Signed-off-by: Stanislav Kozina <skozina@redhat.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Horses <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 6259242b785844d09e5a9d81c58d5bff184560a6..8c0b7b42319c44d7038892d0026582797acad95a 100644 (file)
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1742,7 +1742,8 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 
 do_it_again:
 
-       BUG_ON(!tty->read_buf);
+       if (WARN_ON(!tty->read_buf))
+               return -EAGAIN;
 
        c = job_control(tty, file);
        if (c < 0)