linux-kernel - [PATCH 6/9] usb/host/fotg210: replace msleep by usleep

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Message-Id: <1444684960-8088-7-git-send-email-peter.senna@gmail.com>
Date:	Mon, 12 Oct 2015 23:22:37 +0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	gregkh@...uxfoundation.org, peter.senna@...il.com,
	sergei.shtylyov@...entembedded.com, jkosina@...e.cz,
	rdunlap@...radead.org, balbi@...com, standby24x7@...il.com,
	chris@...vick.com, stern@...land.harvard.edu,
	john453@...aday-tech.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 6/9] usb/host/fotg210: replace msleep by usleep_range

msleep under 20ms can result in sleeping up to 20ms, which may not be
intended. Replace msleep(5) by usleep_range(5000, 10000). The range of 5
ms is to reduce the chances of creating an interrupt while reducing the
maximum wait time in 50%.

Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
---
 drivers/usb/host/fotg210-hcd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/fotg210-hcd.c b/drivers/usb/host/fotg210-hcd.c
index ae3806d..5413358 100644
--- a/drivers/usb/host/fotg210-hcd.c
+++ b/drivers/usb/host/fotg210-hcd.c
@@ -5085,7 +5085,7 @@ static int fotg210_run(struct usb_hcd *hcd)
 	fotg210->rh_state = FOTG210_RH_RUNNING;
 	/* unblock posted writes */
 	fotg210_readl(fotg210, &fotg210->regs->command);
-	msleep(5);
+	usleep_range(5000, 10000);
 	up_write(&ehci_cf_port_reset_rwsem);
 	fotg210->last_periodic_enable = ktime_get_real();
 
-- 
2.1.0

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