linux-kernel - [PATCH 2/2] usb: ehci-platform: Return immediately from suspend if ehci

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Message-Id: <1397016042-4451-2-git-send-email-gautam.vivek@samsung.com>
Date:	Wed,  9 Apr 2014 09:30:42 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, kgene.kim@...sung.com,
	Alan Stern <stern@...land.harvard.edu>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	Hans de Goede <hdegoede@...hat.com>
Subject: [PATCH 2/2] usb: ehci-platform: Return immediately from suspend if ehci_suspend fails

Patch 'b8efdaf USB: EHCI: add check for wakeup/suspend race'
adds a check for possible race between suspend and wakeup interrupt,
and thereby it returns -EBUSY as error code if there's a wakeup
interrupt.
So the platform host controller should not proceed further with
its suspend callback, rather should return immediately to avoid
powering down the essential things, like phy.

Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: Hauke Mehrtens <hauke@...ke-m.de>
Cc: Hans de Goede <hdegoede@...hat.com>
---

Based on 'usb-next' branch of Greg's usb tree.

 drivers/usb/host/ehci-platform.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index b3a0e11..60d3d1a 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -303,11 +303,13 @@ static int ehci_platform_suspend(struct device *dev)
 	int ret;
 
 	ret = ehci_suspend(hcd, do_wakeup);
+	if (ret)
+		return ret;
 
 	if (pdata->power_suspend)
 		pdata->power_suspend(pdev);
 
-	return ret;
+	return 0;
 }
 
 static int ehci_platform_resume(struct device *dev)
-- 
1.7.10.4

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