From e98b44e90b2e8c58c5cbd921b8509e1b7b4940d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lothar=20Wa=C3=9Fmann?= <LW@KARO-electronics.de>
Date: Wed, 14 Aug 2013 12:44:01 +0300
Subject: [PATCH] usb: chipidea: prevent endless loop registering
platform_devices when probe fails
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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 <LW@KARO-electronics.de>
Reviewed-and-tested-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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 2400b7f87f9787..075b419a3076a9 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;
--
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