Re: [PATCH V3] spi: spi-geni-qcom: Add SPI driver support for GENI based QUP

[dkota]

> > I see there is no need of taking the spinlock as timeout will be 
> > handled
> > after the calculated time as per data size and speed.
> > There is 99.9% less chances of interrupt during the timeout handler.
> > > https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1201081
>
> The thing is, we want it to be 100% reliable, not 99.9% reliable.  Is
> it somehow wrong to add the spinlock?  ...or are you noticing
> performance problems with the spinlock there?  It's just nice not to
> have to think about it.

As I said, timeout will be handled after the calculated time as per data 
size and speed. Enough time is given for interrupt, there is no chance 
of interrupt occurrence during the handle_fifo_timeout(). So there is no 
need of spinlock.