linux-kernel - [PATCH 4.4 48/56] MIPS: AR7: Defer registration of GPIO

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Date:   Mon, 13 Nov 2017 13:56:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jonas Gorski <jonas.gorski@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>,
        Nicolas Schichan <nschichan@...ebox.fr>,
        linux-mips@...ux-mips.org, linux-serial@...r.kernel.org,
        James Hogan <jhogan@...nel.org>
Subject: [PATCH 4.4 48/56] MIPS: AR7: Defer registration of GPIO

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

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

From: Jonas Gorski <jonas.gorski@...il.com>

commit e6b03ab63b4d270e0249f96536fde632409dc1dc upstream.

When called from prom init code, ar7_gpio_init() will fail as it will
call gpiochip_add() which relies on a working kmalloc() to alloc
the gpio_desc array and kmalloc is not useable yet at prom init time.

Move ar7_gpio_init() to ar7_register_devices() (a device_initcall)
where kmalloc works.

Fixes: 14e85c0e69d5 ("gpio: remove gpio_descs global array")
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
Cc: Nicolas Schichan <nschichan@...ebox.fr>
Cc: linux-mips@...ux-mips.org
Cc: linux-serial@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17542/
Signed-off-by: James Hogan <jhogan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/ar7/platform.c |    4 ++++
 arch/mips/ar7/prom.c     |    2 --
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/arch/mips/ar7/platform.c
+++ b/arch/mips/ar7/platform.c
@@ -654,6 +654,10 @@ static int __init ar7_register_devices(v
 	u32 val;
 	int res;
 
+	res = ar7_gpio_init();
+	if (res)
+		pr_warn("unable to register gpios: %d\n", res);
+
 	res = ar7_register_uarts();
 	if (res)
 		pr_err("unable to setup uart(s): %d\n", res);
--- a/arch/mips/ar7/prom.c
+++ b/arch/mips/ar7/prom.c
@@ -246,8 +246,6 @@ void __init prom_init(void)
 	ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
 	ar7_init_env((struct env_var *)fw_arg2);
 	console_config();
-
-	ar7_gpio_init();
 }
 
 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))