linux-kernel - [ 030/124] tty: atmel_serial_probe(): index of atmel

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Message-Id: <20130402221107.654308132@linuxfoundation.org>
Date:	Tue,  2 Apr 2013 15:10:12 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Pawel Wieczorkiewicz <wpawel@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: [ 030/124] tty: atmel_serial_probe(): index of atmel_ports[] fix

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pawel Wieczorkiewicz <wpawel@...il.com>

commit 503bded92da283b2f31d87e054c4c6d30c3c2340 upstream.

Index of atmel_ports[ATMEL_MAX_UART] should be smaller
than ATMEL_MAX_UART.

Signed-off-by: Pawel Wieczorkiewicz <wpawel@...il.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/atmel_serial.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -158,7 +158,7 @@ struct atmel_uart_port {
 };
 
 static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
-static unsigned long atmel_ports_in_use;
+static DECLARE_BITMAP(atmel_ports_in_use, ATMEL_MAX_UART);
 
 #ifdef SUPPORT_SYSRQ
 static struct console atmel_console;
@@ -1768,15 +1768,14 @@ static int atmel_serial_probe(struct pla
 	if (ret < 0)
 		/* port id not found in platform data nor device-tree aliases:
 		 * auto-enumerate it */
-		ret = find_first_zero_bit(&atmel_ports_in_use,
-				sizeof(atmel_ports_in_use));
+		ret = find_first_zero_bit(atmel_ports_in_use, ATMEL_MAX_UART);
 
-	if (ret > ATMEL_MAX_UART) {
+	if (ret >= ATMEL_MAX_UART) {
 		ret = -ENODEV;
 		goto err;
 	}
 
-	if (test_and_set_bit(ret, &atmel_ports_in_use)) {
+	if (test_and_set_bit(ret, atmel_ports_in_use)) {
 		/* port already in use */
 		ret = -EBUSY;
 		goto err;
@@ -1856,7 +1855,7 @@ static int atmel_serial_remove(struct pl
 
 	/* "port" is allocated statically, so we shouldn't free it */
 
-	clear_bit(port->line, &atmel_ports_in_use);
+	clear_bit(port->line, atmel_ports_in_use);
 
 	clk_put(atmel_port->clk);
 


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