linux-kernel - [PATCH V2] dummy_hcd: replace timeval with timespec64

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Message-Id: <1442459389-11171-1-git-send-email-pingbo.wen@linaro.org>
Date:	Thu, 17 Sep 2015 11:09:49 +0800
From:	WEN Pingbo <pingbo.wen@...aro.org>
To:	linux-usb@...r.kernel.org
Cc:	WEN Pingbo <pingbo.wen@...aro.org>, Y2038 <y2038@...ts.linaro.org>,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Felipe Balbi <balbi@...com>
Subject: [PATCH V2] dummy_hcd: replace timeval with timespec64

The millisecond of the last second will be normal if tv_sec is
overflowed. But for y2038 consistency and demonstration purpose,
and avoiding further risks, we need to remove 'timeval' in this
driver, to avoid similair problems.

V2 Updates:
- using monotonic time here by replacing getnstimeofday() with
  ktime_get_ts64(), to avoid leap second issues. The frame time in USB
  is always 1ms, no matter what speed, so ktime_get_ts64() have enough
  resolution to cover this.
- using NSEC_PER_MSEC instead of hard code.

Signed-off-by: Pingbo Wen <pingbo.wen@...aro.org>
Cc: Y2038 <y2038@...ts.linaro.org>
Cc: linux-kernel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Felipe Balbi <balbi@...com>
Signed-off-by: WEN Pingbo <pingbo.wen@...aro.org>
---
 drivers/usb/gadget/udc/dummy_hcd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index 1379ad4..6d1ed35 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -833,10 +833,10 @@ static const struct usb_ep_ops dummy_ep_ops = {
 /* there are both host and device side versions of this call ... */
 static int dummy_g_get_frame(struct usb_gadget *_gadget)
 {
-	struct timeval	tv;
+	struct timespec64 tv;
 
-	do_gettimeofday(&tv);
-	return tv.tv_usec / 1000;
+	ktime_get_ts64(&tv);
+	return tv.tv_nsec / NSEC_PER_MSEC;
 }
 
 static int dummy_wakeup(struct usb_gadget *_gadget)
-- 
1.9.1

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