linux-kernel - [PATCH -next] serial: etraxfs-uart: Fix crash

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Message-Id: <1446431576-4385-1-git-send-email-linux@roeck-us.net>
Date:	Sun,  1 Nov 2015 18:32:56 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Niklas Cassel <nks@...wful.org>
Subject: [PATCH -next] serial: etraxfs-uart: Fix crash

Since commit 7d8c70d8048c ("serial: mctrl-gpio: rename init function"),
crisv32 either do not build or crash as follows.

Unable to handle kernel NULL pointer dereference
Linux 4.3.0-rc7-next-20151101 #1 Sun Nov 1 11:41:28 PST 2015
...
Call Trace: [<c0004a0e>] show_stack+0x0/0x9e
[<c004c0c0>] printk+0x0/0x2c
[<c00059d4>] show_registers+0x14a/0x1c2
[<c004c0c0>] printk+0x0/0x2c
[<c0004b52>] die_if_kernel+0x7c/0x9e
[<c0005346>] do_page_fault+0x32e/0x3e6
[<c01dc59c>] of_get_property+0x0/0x2c
[<c01e0558>] of_irq_parse_raw+0x12a/0x376
[<c01dc59c>] of_get_property+0x0/0x2c
[<c0053aca>] get_page_from_freelist+0x73e/0x856
[<c01dc59c>] of_get_property+0x0/0x2c
[<c0008912>] d_mmu_refill+0x10a/0x112
[<c01b488c>] devm_kmalloc+0x40/0x56
[<c01b47d0>] add_dr+0xc/0x1c
[<c01b4800>] devm_add_action+0x2/0x4e
[<c01abdbc>] mctrl_gpio_init_noauto+0x1c/0x76
[<c01abf9e>] mctrl_gpio_init+0x22/0x110

The function call in the etraxfs-uart driver was not renamed,
possibly due to interference with commit 7b9c5162c182 ("serial:
etraxfs-uart: use mctrl_gpio helpers for handling modem signals").

Fixes: 7d8c70d8048c ("serial: mctrl-gpio: rename init function")
Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Niklas Cassel <nks@...wful.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
It might make sense to merge this patch into the original patch if possible.

 drivers/tty/serial/etraxfs-uart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/etraxfs-uart.c b/drivers/tty/serial/etraxfs-uart.c
index 6813e316e9ff..2f80bc7e44fb 100644
--- a/drivers/tty/serial/etraxfs-uart.c
+++ b/drivers/tty/serial/etraxfs-uart.c
@@ -894,7 +894,7 @@ static int etraxfs_uart_probe(struct platform_device *pdev)
 	up->regi_ser = of_iomap(np, 0);
 	up->port.dev = &pdev->dev;
 
-	up->gpios = mctrl_gpio_init(&pdev->dev, 0);
+	up->gpios = mctrl_gpio_init_noauto(&pdev->dev, 0);
 	if (IS_ERR(up->gpios))
 		return PTR_ERR(up->gpios);
 
-- 
2.1.4

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