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.vi...@samsung.com>
Cc: Alan Stern <st...@rowland.harvard.edu>
Cc: Jingoo Han <jg1....@samsung.com>
---
Based on 'usb-next' branch of Greg's usb tree.
drivers/usb/host/ehci-exynos.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index d1d8c47..a4550eb 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -212,6 +212,8 @@ static int exynos_ehci_suspend(struct device *dev)
int rc;
rc = ehci_suspend(hcd, do_wakeup);
+ if (rc)
+ return rc;
if (exynos_ehci->otg)
exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
@@ -221,7 +223,7 @@ static int exynos_ehci_suspend(struct device *dev)
clk_disable_unprepare(exynos_ehci->clk);
- return rc;
+ return 0;
}
static int exynos_ehci_resume(struct device *dev)
--
1.7.10.4
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