linux-kernel - Re: [PATCH 06/14] RFC: usb/host/fotg210: replace msleep by usleep

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Message-ID: <CA+MoWDrGds17eQcbQhVZDfYyuxY45R5kk5qXw6U+Bu-8SLPxcQ@mail.gmail.com>
Date:	Sun, 4 Oct 2015 11:58:20 +0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Felipe Balbi <balbi@...com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Masanari Iida <standby24x7@...il.com>, pmladek@...e.cz,
	linux-usb@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 06/14] RFC: usb/host/fotg210: replace msleep by usleep_range

On Fri, Oct 2, 2015 at 7:52 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Fri, 2 Oct 2015, Felipe Balbi wrote:
>
>> On Mon, Sep 21, 2015 at 05:01:10PM +0200, Peter Senna Tschudin wrote:
>> > msleep under 20ms can result in sleeping up to 20ms, which may not be
>> > intended. Replace msleep(5) by usleep_range(5000, 6000).
>> >
>> > Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
>>
>> good catch. I'd apply this straight away. Alan ?
>
> It really doesn't matter.  As long as the delay is at least 5 ms, it
> can be arbitrarily long.  This won't hurt, and if it prevents automated
> tools from complaining then it's worthwhile.
Then is it a good idea to increase the range to reduce chances of
creating an interrupt?

usleep_range(5000, 10000)?

>
> Peter, a lot of the changes you have been making will also apply to the
> ehci-hcd driver.  Do you want to update it as well?  One caution: The
> style used for continuation lines is to add two extra tab stops, not to
> align things with an open paren on the original line.
The drivers with more checkpatch errors and warnings are:

<number of errors> <number of warnings> <path>

117 586 drivers/usb/host/fusbh200-hcd.c
38 124 drivers/usb/host/ohci-q.c
38 122 drivers/usb/host/ehci-dbg.c
37 118 drivers/usb/host/ohci-dbg.c
36 129 drivers/usb/host/ehci-sched.c
24 136 drivers/usb/host/ohci-hcd.c
23 16 drivers/usb/host/sl811-hcd.c
20 105 drivers/usb/host/ohci-hub.c
18 48 drivers/usb/host/ehci-hub.c

17 70 drivers/usb/host/ehci-hcd.c

13 4 drivers/usb/host/uhci-debug.c
12 93 drivers/usb/host/ehci-q.c
9 83 drivers/usb/host/isp116x-hcd.c
9 32 drivers/usb/host/fotg210-hcd.c
7 29 drivers/usb/host/oxu210hp-hcd.c
6 4 drivers/usb/host/sl811_cs.c

I'll fix ehci-hcd. Do you want patches for the others?

I'll fix the alignment using two extra tabs instead of aligning with
opening parenthesis. Thank you.


-- 
Peter
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