linux-kernel - [PATCH 1/1] usb: usleep_range is preferred over udelay where wakeup is flexible

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Message-Id: <1435128869-20263-1-git-send-email-sunny.kumar.roy@gmail.com>
Date:	Wed, 24 Jun 2015 12:24:29 +0530
From:	Sunny Kumar <sunny.kumar.roy@...il.com>
To:	mdharm-usb@...-eyed-alien.net, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
	linux-kernel@...r.kernel.org
Cc:	swt.sunny@...il.com, Sunny Kumar <sunny.kumar.roy@...il.com>
Subject: [PATCH 1/1] usb: usleep_range is preferred over udelay where wakeup is flexible

According to Documentation/timers/timers-howto.txt"
udelay() is only called once from a place where sleeping is allowed.
We can replace it with a call to usleep_range()
with a reasonable upper limit.

Signed-off-by: Sunny Kumar <sunny.kumar.roy@...il.com>
---
 drivers/usb/storage/transport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index 540add2..7cd45ac 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -1111,7 +1111,7 @@ int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
 	 * command phase and the data phase.  Some devices need a little
 	 * more than that, probably because of clock rate inaccuracies. */
 	if (unlikely(us->fflags & US_FL_GO_SLOW))
-		udelay(125);
+		usleep_range(100, 125);
 
 	if (transfer_length) {
 		unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 
-- 
2.1.4

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