linux-kernel - [PATCH 4.7 106/143] gpio: max730x: set gpiochip data pointer before using it

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Message-Id: <20160905164435.103317200@linuxfoundation.org>
Date:   Mon,  5 Sep 2016 18:44:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Christophe Leroy <christophe.leroy@....fr>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.7 106/143] gpio: max730x: set gpiochip data pointer before using it

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

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

From: Christophe Leroy <christophe.leroy@....fr>

commit 6f4deb18a505523eb7925d646574a95f9e982ff7 upstream.

gpiochip_add_data() has to be called before calling
max7301_direction_input()

[    4.389883] Unable to handle kernel paging request for data at address 0x00000018
[    4.397282] Faulting instruction address: 0xc01a8cbc
[    4.402023] Oops: Kernel access of bad area, sig: 11 [#1]
[    4.407331] PREEMPT CMPC885
[    4.410131] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 4.5.0-gacdfdee #39
[    4.418592] Workqueue: deferwq deferred_probe_work_func
[    4.423711] task: c60798b0 ti: c608a000 task.ti: c608a000
[    4.429038] NIP: c01a8cbc LR: c01a8e24 CTR: c01ff028
[    4.433953] REGS: c608bad0 TRAP: 0300   Not tainted  (4.5.0-s3k-dev-gacdfdee-svn-dirty)
[    4.441847] MSR: 00009032 <EE,ME,IR,DR,RI>  CR: 33039553  XER: a000f940
[    4.448395] DAR: 00000018 DSISR: c0000000
GPR00: c01a8e24 c608bb80 c60798b0 c60d6f6c 00000004 00000002 07de2900 00700000
GPR08: 00000000 00000000 c608a000 00001032 35039553 00000000 c002f37c c6010b64
GPR16: c6010a48 c6010a14 c6010a00 00000000 c0450000 c0453568 c0453438 c050db14
GPR24: c62662bc 00000009 ffffffaa c60d6f5d 00000001 00000000 00000000 00000000
[    4.480371] NIP [c01a8cbc] max7301_direction_input+0x20/0x9c
[    4.485951] LR [c01a8e24] __max730x_probe+0xec/0x138
[    4.490812] Call Trace:
[    4.493268] [c608bba0] [c01a8e24] __max730x_probe+0xec/0x138
[    4.498878] [c608bbc0] [c01cc368] driver_probe_device+0x190/0x38c
[    4.504895] [c608bbf0] [c01ca918] bus_for_each_drv+0x58/0xb4
[    4.510489] [c608bc20] [c01cc04c] __device_attach+0x8c/0x110
[    4.516082] [c608bc50] [c01cab80] bus_probe_device+0x34/0xb8
[    4.521673] [c608bc70] [c01c96c8] device_add+0x3c0/0x598
[    4.526925] [c608bcb0] [c0200f90] spi_add_device+0x114/0x160
[    4.532512] [c608bcd0] [c02018d0] spi_register_master+0x6e0/0x7c8
[    4.538537] [c608bd20] [c02019fc] devm_spi_register_master+0x44/0x8c
[    4.544824] [c608bd40] [c0203854] of_fsl_spi_probe+0x458/0x57c
[    4.550587] [c608bda0] [c01cd828] platform_drv_probe+0x30/0x74
[    4.556366] [c608bdb0] [c01cc368] driver_probe_device+0x190/0x38c
[    4.562383] [c608bde0] [c01ca918] bus_for_each_drv+0x58/0xb4
[    4.567977] [c608be10] [c01cc04c] __device_attach+0x8c/0x110
[    4.573572] [c608be40] [c01cab80] bus_probe_device+0x34/0xb8
[    4.579170] [c608be60] [c01cb9b4] deferred_probe_work_func+0xa4/0xc4
[    4.585438] [c608be80] [c0029c04] process_one_work+0x22c/0x414
[    4.591201] [c608bea0] [c002a100] worker_thread+0x314/0x5c0
[    4.596722] [c608bef0] [c002f444] kthread+0xc8/0xcc
[    4.601538] [c608bf40] [c000af84] ret_from_kernel_thread+0x5c/0x64
[    4.607596] Instruction dump:
[    4.610530] 7c0803a6 bba10014 38210020 4e800020 7c0802a6 9421ffe0 38840004 bf810010
[    4.618188] 90010024 549cf0be 83c30010 549d0f7c <813e0018> 7fc3f378 7d3f2430 57ff07fe
[    4.626041] ---[ end trace 303adb021dd4caf2 ]---

fixes: 5e45e01916197 ("gpio: max730x: use gpiochip data pointer")
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpio/gpio-max730x.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/gpio/gpio-max730x.c
+++ b/drivers/gpio/gpio-max730x.c
@@ -192,6 +192,10 @@ int __max730x_probe(struct max7301 *ts)
 	ts->chip.parent = dev;
 	ts->chip.owner = THIS_MODULE;
 
+	ret = gpiochip_add_data(&ts->chip, ts);
+	if (ret)
+		goto exit_destroy;
+
 	/*
 	 * initialize pullups according to platform data and cache the
 	 * register values for later use.
@@ -213,10 +217,6 @@ int __max730x_probe(struct max7301 *ts)
 		}
 	}
 
-	ret = gpiochip_add_data(&ts->chip, ts);
-	if (ret)
-		goto exit_destroy;
-
 	return ret;
 
 exit_destroy: