linux-kernel - Re: [PATCH] USB: image: use msecs_to

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Date:	Fri, 06 Feb 2015 16:43:46 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Nicholas Mc Guire <der.herr@...r.at>
CC:	Nicholas Mc Guire <hofrat@...dl.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: image: use msecs_to_jiffies for time conversion

On 2/6/2015 4:36 PM, Nicholas Mc Guire wrote:

>>> This is only an API consolidation and should make things more readable
>>> it replaces var * HZ / 1000 by msecs_to_jiffies(var).

>>> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
>>> ---

>>> Note that the indentation is not aligned with the correct ( here due to
>>> lines going over 80 char - not sure if this is the right way to resolve
>>> this (this file has quite a few coding style issues).

>>> Patch was only compile tested with x86_64_defconfig + CONFIG_USB_MDC800=m

>>> Patch is against 3.19.0-rc7 (localversion-next is -next-20150204)

>>>    drivers/usb/image/mdc800.c |   11 +++++++----
>>>    1 file changed, 7 insertions(+), 4 deletions(-)

>>> diff --git a/drivers/usb/image/mdc800.c b/drivers/usb/image/mdc800.c
>>> index a62865a..3a72e8f 100644
>>> --- a/drivers/usb/image/mdc800.c
>>> +++ b/drivers/usb/image/mdc800.c
>> [...]
>>> @@ -743,8 +744,9 @@ static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t l
>>>    					mutex_unlock(&mdc800->io_lock);
>>>    					return len-left;
>>>    				}
>>> -				wait_event_timeout(mdc800->download_wait, mdc800->downloaded,
>>> -										TO_DOWNLOAD_GET_READY*HZ/1000);
>>> +				wait_event_timeout(mdc800->download_wait,
>>> +				     mdc800->downloaded,
>>> +				     msecs_to_jiffies(TO_DOWNLOAD_GET_READY));

>>     Don't indent with spaces (you're not aligning to open paren anyway),
>> use the final tab instead, please.

> thanks ! In the diff output that problem is actually not well visible.
> was not really clear on how to do this properly - the problem with
> using the last tab stop is that you then get the following code

>                                  wait_event_timeout(mdc800->download_wait,
>                                  mdc800->downloaded,
>                                  msecs_to_jiffies(TO_DOWNLOAD_GET_READY));
>                                  mdc800->downloaded = 0;

> which semed really bad and

    Yes, it's horrible.

> 				wait_event_timeout(mdc800->download_wait,
>                                       mdc800->downloaded,
>                                       msecs_to_jiffies(TO_DOWNLOAD_GET_READY));
>                                  mdc800->downloaded = 0;

> makes it atleast somewhat readable. If I indent a full tab ghen it goes over
> 80 char.

    Ah, I didn't realize that, sorry.

> So in this case - should one use the last tab-stop anyway ?

    Probably not.

> thx!
> hofrat

WBR, Sergei

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