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[v4,4/5] dvb-usb-v2/gl861: use usleep_range() for short delay

Message ID 20180328170101.29385-5-tskd08@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Akihiro TSUKADA March 28, 2018, 5:01 p.m. UTC 
From: Akihiro Tsukada <tskd08@gmail.com>

As the kernel doc "timers-howto.txt" reads,
short delay with msleep() can take much longer.
In a case of raspbery-pi platform where CONFIG_HZ_100 was set,
it actually affected the init of Friio devices
since it issues lots of i2c transactions with short delay.

Signed-off-by: Akihiro Tsukada <tskd08@gmail.com>
---
Changes since v3:
- none

 drivers/media/usb/dvb-usb-v2/gl861.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/media/usb/dvb-usb-v2/gl861.c b/drivers/media/usb/dvb-usb-v2/gl861.c
index a0280126bfc..6f6dfa65bba 100644
--- a/drivers/media/usb/dvb-usb-v2/gl861.c
+++ b/drivers/media/usb/dvb-usb-v2/gl861.c
@@ -45,7 +45,7 @@  static int gl861_i2c_msg(struct dvb_usb_device *d, u8 addr,
 		return -EINVAL;
 	}
 
-	msleep(1); /* avoid I2C errors */
+	usleep_range(1000, 2000); /* avoid I2C errors */
 
 	return usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev, 0), req, type,
 			       value, index, rbuf, rlen, 2000);