On Thu, 2 Mar 2017, SIMRAN SINGHAL wrote:
>
>
> On Thursday, March 2, 2017 at 8:06:40 PM UTC+5:30, Julia Lawall wrote:
>
>
> On Thu, 2 Mar 2017, simran singhal wrote:
>
> > Resolve strict checkpatch USLEEP_RANGE checks by converting
> delays and
> > sleeps as described in
> ./Documentation/timers/timers-howto.txt.
> >
> > CHECK: usleep_range is preferred over udelay; see
> Documentation/
> > timers/timers-howto.txt
> >
> > Signed-off-by: simran singhal <singhal...@xxxxxxxxx>
> > ---
> > drivers/staging/nvec/nvec.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/staging/nvec/nvec.c
> b/drivers/staging/nvec/nvec.c
> > index c1feccf..cd35e64 100644
> > --- a/drivers/staging/nvec/nvec.c
> > +++ b/drivers/staging/nvec/nvec.c
> > @@ -631,7 +631,7 @@ static irqreturn_t nvec_interrupt(int irq,
> void *dev)
> > break;
> > case 2: /* first byte after command */
> > if (status == (I2C_SL_IRQ | RNW | RCVD)) {
> > - udelay(33);
> > + usleep_range(33, 100);
>
> How did you choose the upper limit.
>
> I believe that Greg previously suggested not to make these
> changes if you
> have no way to test them.
>
> Julia, After going through the reply given by Nicholas Mc Guire
> https://www.mail-archive.com/kernelnewbies@xxxxxxxxxxxxxxxxx/msg16464.html
> in this reply he has mentioned that even the range of 10 microsecond is
> enough,
> so I prefer to take 100 as upper limit.
Than you for the link.
It looks like he suggests to change 33 to 30-40, not to 33-100. In any
case, you have three choices for this kind of issue:
1. Don't make the change, because you can't test the result
2. Make the change, and explain the commit log what your rationale is
3. Make the change, and explain below the --- that you have no idea what
you are doing, and you are just proposing the patch as something concrete
to start a discussion.
But your preference is not a suitable justification. The hardware does
something, and the choice can only really be made by the person who knows
what it does.
julia
>
> Simran
>
> julia
>
>
> > if (nvec->rx->data[0] != 0x01) {
> > dev_err(nvec->dev,
> > "Read without prior
> read command\n");
> > @@ -718,7 +718,7 @@ static irqreturn_t nvec_interrupt(int irq,
> void *dev)
> > * We experience less incomplete messages with this
> delay than without
> > * it, but we don't know why. Help is appreciated.
> > */
> > - udelay(100);
> > + usleep_range(100, 200);
> >
> > return IRQ_HANDLED;
> > }
> > --
> > 2.7.4
> >
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