linux-kernel - [PATCH] Fix serial_match_port() for dynamic major tty-device numbers

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Message-ID: <Pine.LNX.4.64.0806220037250.461@axis700.grange>
Date:	Sun, 22 Jun 2008 00:45:25 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	vcgandhi1@....com, linux-kernel@...r.kernel.org
cc:	linux-serial@...r.kernel.org
Subject: [PATCH] Fix serial_match_port() for dynamic major tty-device numbers

As reported by Vipul Gandhi, the current serial_match_port() doesn't work 
for tty-devices using dynamic major number allocation. Fix it.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
Tested-by: Vipul Gandhi <vcgandhi1@....com>

---

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 0f5a179..593ae85 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -1949,7 +1949,9 @@ struct uart_match {
 static int serial_match_port(struct device *dev, void *data)
 {
 	struct uart_match *match = data;
-	dev_t devt = MKDEV(match->driver->major, match->driver->minor) + match->port->line;
+	struct tty_driver *tty_drv = match->driver->tty_driver;
+	dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) +
+		match->port->line;
 
 	return dev->devt == devt; /* Actually, only one tty per port */
 }
--
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