linux-kernel - Re: [PATCH] net: usb: sr9700: Replace mdelay() with msleep() in sr9700

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Message-ID: <201807271704468308230@163.com>
Date:   Fri, 27 Jul 2018 17:04:48 +0800
From:   "liujunliang_ljl@....com" <liujunliang_ljl@....com>
To:     "Jia-Ju Bai" <baijiaju1990@...il.com>
Cc:     linux-usb <linux-usb@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "Jia-Ju Bai" <baijiaju1990@...il.com>
Subject: Re: [PATCH] net: usb: sr9700: Replace mdelay() with msleep() in sr9700_bind()

Dear Jia-Ju Bai :

            OK.

            the patch is ok.



liujunliang_ljl@....com
 
From: Jia-Ju Bai
Date: 2018-07-27 16:41
To: liujunliang_ljl
CC: linux-usb; netdev; linux-kernel; Jia-Ju Bai
Subject: [PATCH] net: usb: sr9700: Replace mdelay() with msleep() in sr9700_bind()
sr9700_bind() is never called in atomic context.
It calls mdelay() to busily wait, which is not necessary.
mdelay() can be replaced with msleep().
 
This is found by a static analysis tool named DCNS written by myself.
 
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
drivers/net/usb/sr9700.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c
index 2d316c1b851b..6ac232e52bf7 100644
--- a/drivers/net/usb/sr9700.c
+++ b/drivers/net/usb/sr9700.c
@@ -358,7 +358,7 @@ static int sr9700_bind(struct usbnet *dev, struct usb_interface *intf)
/* power up and reset phy */
sr_write_reg(dev, SR_PRR, PRR_PHY_RST);
/* at least 10ms, here 20ms for safe */
- mdelay(20);
+ msleep(20);
sr_write_reg(dev, SR_PRR, 0);
/* at least 1ms, here 2ms for reading right register */
udelay(2 * 1000);
-- 
2.17.0

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