From: Fabio Estevam <festevam@gmail.com>
To: davem@davemloft.net
Cc: s.hauer@pengutronix.de, shawn.guo@linaro.org, marex@denx.de,
netdev@vger.kernel.org,
Fabio Estevam <fabio.estevam@freescale.com>
Subject: [PATCH v2 1/2] net: fec: Do a sanity check on the gpio number
Date: Sun, 17 Feb 2013 10:36:43 -0300 [thread overview]
Message-ID: <1361108204-9498-1-git-send-email-festevam@gmail.com> (raw)
From: Fabio Estevam <fabio.estevam@freescale.com>
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] [<c0014e20>] (unwind_backtrace+0x0/0xf4) from [<c001d428>] (warn_slowpath_common+0x4c/0x68)
[ 5.144682] [<c001d428>] (warn_slowpath_common+0x4c/0x68) from [<c001d4d8>] (warn_slowpath_fmt+0x30/0x40)
[ 5.154693] [<c001d4d8>] (warn_slowpath_fmt+0x30/0x40) from [<c0283434>] (gpio_to_desc+0x30/0x44)
[ 5.164002] [<c0283434>] (gpio_to_desc+0x30/0x44) from [<c0285470>] (gpio_request_one+0x10/0xe8)
[ 5.173294] [<c0285470>] (gpio_request_one+0x10/0xe8) from [<c0282f50>] (devm_gpio_request_one+0x40/0x74)
[ 5.183332] [<c0282f50>] (devm_gpio_request_one+0x40/0x74) from [<c0319be0>] (fec_probe+0x2d0/0x99c)
[ 5.192923] [<c0319be0>] (fec_probe+0x2d0/0x99c) from [<c02c8114>] (platform_drv_probe+0x14/0x18)
[ 5.202228] [<c02c8114>] (platform_drv_probe+0x14/0x18) from [<c02c6e00>] (driver_probe_device+0x90/0x224)
[ 5.212332] [<c02c6e00>] (driver_probe_device+0x90/0x224) from [<c02c7028>] (__driver_attach+0x94/0x98)
[ 5.222162] [<c02c7028>] (__driver_attach+0x94/0x98) from [<c02c5750>] (bus_for_each_dev+0x78/0x98)
[ 5.231642] [<c02c5750>] (bus_for_each_dev+0x78/0x98) from [<c02c5fd0>] (bus_add_driver+0x1a4/0x240)
[ 5.241207] [<c02c5fd0>] (bus_add_driver+0x1a4/0x240) from [<c02c7608>] (driver_register+0x78/0x140)
[ 5.250768] [<c02c7608>] (driver_register+0x78/0x140) from [<c00087a4>] (do_one_initcall+0x30/0x17c)
[ 5.260347] [<c00087a4>] (do_one_initcall+0x30/0x17c) from [<c05fa29c>] (kernel_init_freeable+0xe8/0x1b0)
[ 5.270381] [<c05fa29c>] (kernel_init_freeable+0xe8/0x1b0) from [<c044dfd4>] (kernel_init+0x8/0xe4)
[ 5.279886] [<c044dfd4>] (kernel_init+0x8/0xe4) from [<c000f248>] (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 <fabio.estevam@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
---
Changes since v1:
- Added Shawn's ack
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
next reply other threads:[~2013-02-17 13:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-17 13:36 Fabio Estevam [this message]
2013-02-17 13:36 ` [PATCH v2 2/2] net: fec: Improve logging Fabio Estevam
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