Re: [PATCH v4 2/6] PCI: spacemit-k1: Add multiple PHY handles support

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Sun, Jul 12, 2026 at 01:41:25PM +0800, Inochi Amaoto wrote:
> On Sat, Jul 11, 2026 at 03:44:10PM +0300, Andy Shevchenko wrote:
> > On Fri, Jul 10, 2026 at 06:55:10PM +0800, Inochi Amaoto wrote:
> > > On Fri, Jul 10, 2026 at 11:07:40AM +0300, Andy Shevchenko wrote:
> > > > On Fri, Jul 10, 2026 at 09:57:05AM +0800, Inochi Amaoto wrote:
> > > > > On Thu, Jul 09, 2026 at 10:16:28AM +0300, Andy Shevchenko wrote:
> > > > > > On Thu, Jul 09, 2026 at 12:00:22PM +0800, Inochi Amaoto wrote:

...

> > Then the counted_by will be incorrect as it may access valid memory, but
> > unused by the driver.
> 
> After some search I found a requirement in GCC patch:
> https://gcc.gnu.org/pipermail/gcc-patches/2024-May/653123.html
> 
> It seems like the array can have more elements than the counter.
> Some I guess the reallocation is not necessary and the counter
> is still correct. Correct me if I am wrong.

There will be no problem from memory accesses point of view, but there are two
disadvantages:
- the waste of memory for unused items
- the memory accesses beyond used items, which may lead to or show the subtle
  issues in the code elsewhere

Better to be correct. It might help debugging as well in some other cases.

...

> > > > > > > +	for (i = 0; i < k1->phy_count; i++)
> > > > > > 
> > > > > > 	for (unsigned int i = 0; i < k1->phy_count; i++)
> > > > > 
> > > > > I agree with the unsigned int, but I guess this definition is not
> > > > > allowed in linux.
> > > > 
> > > > It's allowed and it's encouraged even by Linus. As long as iterator is local,
> > > > use this syntax sugar and reduce its scope. It hardens the code.
> > > 
> > > Could you give me a reference url to check,
> > 
> > Sure, there are two (one for integers and one for pointers)
> > https://lore.kernel.org/lkml/CAHk-=wiCOTW5UftUrAnvJkr6769D29tF7Of79gUjdQHS_TkF5A@mail.gmail.com/
> > https://lore.kernel.org/lkml/CAHk-=wgy8p4is8ApEQCT5NS7XFb+NXeo-TKz7jRRZVksLLBSrQ@mail.gmail.com/
> > 
> > > I have not found this on the coding-style.
> > > https://www.kernel.org/doc/html/latest/process/coding-style.html
> > 
> > Feel free to update the documentation.
> 
> Good to know thanks.

Are you going to update documentation? I can review it.

> > > > > > > +		phy_exit(k1->phy[i]);

-- 
With Best Regards,
Andy Shevchenko