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-rw-r--r--drivers/char/n_hdlc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c
index ed4e03333ab..69ec6399c71 100644
--- a/drivers/char/n_hdlc.c
+++ b/drivers/char/n_hdlc.c
@@ -677,6 +677,10 @@ static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,
/* Allocate transmit buffer */
/* sleep until transmit buffer available */
while (!(tbuf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list))) {
+ if (file->f_flags & O_NONBLOCK) {
+ error = -EAGAIN;
+ break;
+ }
schedule();
n_hdlc = tty2n_hdlc (tty);