linux-kernel - [PATCH] make n_hdlc honor O

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Date:	Thu, 17 Jul 2008 08:55:00 -0500
From:	Paul Fulghum <paulkf@...rogate.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] make n_hdlc honor O_NONBLOCK on write

Make n_hdlc line discipline honor the O_NONBLOCK
file flag on write.

Signed-off-by: Paul Fulghum <paulkf@...rogate.com>

--- a/drivers/char/n_hdlc.c	2008-07-17 08:39:15.000000000 -0500
+++ b/drivers/char/n_hdlc.c	2008-07-17 08:43:58.000000000 -0500
@@ -677,6 +677,10 @@ static ssize_t n_hdlc_tty_write(struct t
 	/* 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);


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