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[v2,3/7] usb: chipidea: usbmisc: fix a potential race condition

Message ID 1352981028-14312-4-git-send-email-m.grzeschik@pengutronix.de (mailing list archive)
State New, archived
Headers show

Commit Message

Michael Grzeschik Nov. 15, 2012, 12:03 p.m. UTC 
From: Marc Kleine-Budde <mkl@pengutronix.de>

This fixes a potential race condition where the ci13xxx_imx glue code
could be fast enough to call one of the usbmisc_ops before he got a
valid value on the static usbmisc pointer. To fix that we first set
usbmisc, then call usbmisc_set_ops().

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
---
Changes since v1:
* split previous patch into two seperate.

 drivers/usb/chipidea/usbmisc_imx.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 552c63f..9145e04 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -116,14 +116,14 @@  static int __devinit usbmisc_imx_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	usbmisc = data;
 	ret = usbmisc_set_ops(&imx6q_usbmisc_ops);
 	if (ret) {
+		usbmisc = NULL;
 		clk_disable_unprepare(data->clk);
 		return ret;
 	}
 
-	usbmisc = data;
-
 	return 0;
 }