On Fri, Nov 13, 2020 at 04:40:20AM +0200, Vladimir Oltean wrote: > > @@ -103,6 +108,10 @@ static int ksz9477_ptp_adjtime(struct ptp_clock_info > > *ptp, s64 delta) > > if (ret) > > goto error_return; > > > > + spin_lock_irqsave(&dev->ptp_clock_lock, flags); > > I believe that spin_lock_irqsave is unnecessary, since there is no code > that runs in hardirq context.
The .adjtime method is in a system call context. If all of the code that manipulates dev->ptp_clock_time can sleep, then you can use a mutex. Otherwise spin_lock_irqsave is the safe choice. Thanks, Richard
