Re: [PATCH] USB: image: use msecs_to_jiffies for time conversion

[Sergei Shtylyov]

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@xxxxxxxxx>
> > > ---

> > > 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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