From e98b44e90b2e8c58c5cbd921b8509e1b7b4940d3 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Lothar=20Wa=C3=9Fmann?= Date: Wed, 14 Aug 2013 12:44:01 +0300 Subject: [PATCH] usb: chipidea: prevent endless loop registering platform_devices when probe fails MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Commit 40dcd0e ("usb: chipidea: add PTW, PTS and STS handling") introduced the following code to the ci_hdrc_probe() function: + if (!dev->of_node && dev->parent) + dev->of_node = dev->parent->of_node; This inadvertently associates the ci_hdrc device with the ci_hdrc_imx driver (which created the ci_hdrc device in the first place). This results in ci_hdrc_imx_probe() being run for the ci_hdrc device if ci_hdrc_probe() fails for some reason. ci_hdrc_imx_probe() will happily create a new ci_hdrc platform_device whose probing will likewise fail and trigger a new invocation of ci_hdrc_imx_probe() ... ad nauseam. Signed-off-by: Lothar Waßmann Reviewed-and-tested-by: Peter Chen Signed-off-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman --- drivers/usb/chipidea/core.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index 2400b7f87f97..075b419a3076 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -404,15 +404,13 @@ static int ci_hdrc_probe(struct platform_device *pdev) void __iomem *base; int ret; enum usb_dr_mode dr_mode; + struct device_node *of_node = dev->of_node ?: dev->parent->of_node; if (!dev->platform_data) { dev_err(dev, "platform data missing\n"); return -ENODEV; } - if (!dev->of_node && dev->parent) - dev->of_node = dev->parent->of_node; - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(dev, res); if (IS_ERR(base)) @@ -453,12 +451,12 @@ static int ci_hdrc_probe(struct platform_device *pdev) } if (!ci->platdata->phy_mode) - ci->platdata->phy_mode = of_usb_get_phy_mode(dev->of_node); + ci->platdata->phy_mode = of_usb_get_phy_mode(of_node); hw_phymode_configure(ci); if (!ci->platdata->dr_mode) - ci->platdata->dr_mode = of_usb_get_dr_mode(dev->of_node); + ci->platdata->dr_mode = of_usb_get_dr_mode(of_node); if (ci->platdata->dr_mode == USB_DR_MODE_UNKNOWN) ci->platdata->dr_mode = USB_DR_MODE_OTG; -- 2.20.1