From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fabio Estevam Subject: [PATCH 1/2] net: fec: Do a sanity check on the gpio number Date: Sat, 16 Feb 2013 20:53:26 -0200 Message-ID: <1361055207-22870-1-git-send-email-festevam@gmail.com> Cc: s.hauer@pengutronix.de, shawn.guo@linaro.org, marex@denx.de, netdev@vger.kernel.org, Fabio Estevam To: davem@davemloft.net Return-path: Received: from mail-gh0-f171.google.com ([209.85.160.171]:34864 "EHLO mail-gh0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754370Ab3BPW6t (ORCPT ); Sat, 16 Feb 2013 17:58:49 -0500 Received: by mail-gh0-f171.google.com with SMTP id r17so348567ghr.16 for ; Sat, 16 Feb 2013 14:58:48 -0800 (PST) Sender: netdev-owner@vger.kernel.org List-ID: From: Fabio Estevam Since commit 372e722ea4d (gpiolib: use descriptors internally) the following warning is seen on a mx28evk board: [ 5.116291] ------------[ cut here ]------------ [ 5.121306] WARNING: at drivers/gpio/gpiolib.c:125 gpio_to_desc+0x30/0x44() [ 5.128491] invalid GPIO -2 [ 5.131563] Modules linked in: [ 5.134846] [] (unwind_backtrace+0x0/0xf4) from [] (warn_slowpath_common+0x4c/0x68) [ 5.144682] [] (warn_slowpath_common+0x4c/0x68) from [] (warn_slowpath_fmt+0x30/0x40) [ 5.154693] [] (warn_slowpath_fmt+0x30/0x40) from [] (gpio_to_desc+0x30/0x44) [ 5.164002] [] (gpio_to_desc+0x30/0x44) from [] (gpio_request_one+0x10/0xe8) [ 5.173294] [] (gpio_request_one+0x10/0xe8) from [] (devm_gpio_request_one+0x40/0x74) [ 5.183332] [] (devm_gpio_request_one+0x40/0x74) from [] (fec_probe+0x2d0/0x99c) [ 5.192923] [] (fec_probe+0x2d0/0x99c) from [] (platform_drv_probe+0x14/0x18) [ 5.202228] [] (platform_drv_probe+0x14/0x18) from [] (driver_probe_device+0x90/0x224) [ 5.212332] [] (driver_probe_device+0x90/0x224) from [] (__driver_attach+0x94/0x98) [ 5.222162] [] (__driver_attach+0x94/0x98) from [] (bus_for_each_dev+0x78/0x98) [ 5.231642] [] (bus_for_each_dev+0x78/0x98) from [] (bus_add_driver+0x1a4/0x240) [ 5.241207] [] (bus_add_driver+0x1a4/0x240) from [] (driver_register+0x78/0x140) [ 5.250768] [] (driver_register+0x78/0x140) from [] (do_one_initcall+0x30/0x17c) [ 5.260347] [] (do_one_initcall+0x30/0x17c) from [] (kernel_init_freeable+0xe8/0x1b0) [ 5.270381] [] (kernel_init_freeable+0xe8/0x1b0) from [] (kernel_init+0x8/0xe4) [ 5.279886] [] (kernel_init+0x8/0xe4) from [] (ret_from_fork+0x14/0x2c) [ 5.288740] ---[ end trace c15c72a22979d58d ]--- mx28evk has two ethernet controllers. The GPIO that performs the ethernet reset on both ports is the same GPIO, so on the board dts file, only in one ethernet instance is passed the GPIO reset property. Validate the gpio number prior to requesting it in order to avoid such warning. Signed-off-by: Fabio Estevam --- drivers/net/ethernet/freescale/fec.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c index 0fe68c4..5864a67 100644 --- a/drivers/net/ethernet/freescale/fec.c +++ b/drivers/net/ethernet/freescale/fec.c @@ -1689,6 +1689,9 @@ static void fec_reset_phy(struct platform_device *pdev) msec = 1; phy_reset = of_get_named_gpio(np, "phy-reset-gpios", 0); + if (!gpio_is_valid(phy_reset)) + return; + err = devm_gpio_request_one(&pdev->dev, phy_reset, GPIOF_OUT_INIT_LOW, "phy-reset"); if (err) { -- 1.7.9.5