Re: [patch 02/10] genirq/msi: Use lock guards for MSI descriptor locking

[Jonathan Cameron <Jonathan.Cameron@huawei.com>]

On Tue, 11 Mar 2025 22:26:52 +0100
Thomas Gleixner <tglx@linutronix.de> wrote:

> On Tue, Mar 11 2025 at 18:00, Jonathan Cameron wrote:
> > On Sun,  9 Mar 2025 09:41:44 +0100 (CET)
> > Thomas Gleixner <tglx@linutronix.de> wrote:  
> 
> >>  
> >> @@ -1037,25 +1032,23 @@ bool msi_create_device_irq_domain(struct
> >>  	if (msi_setup_device_data(dev))  
> >
> > Hmm. We might want to make the docs in cleanup.h more nuanced.
> > They specifically say to not mix goto and auto cleanup, but 
> > in the case of scoped_guard() unlikely almost any other case
> > it should be fine.
> >  
> >>  		goto free_fwnode;  
> 
> I got rid of the gotos. It requires __free() for the two allocations.
That works.

> 
> Thanks,
> 
>         tglx
> ---
> --- a/include/linux/cleanup.h
> +++ b/include/linux/cleanup.h
> @@ -216,6 +216,8 @@ const volatile void * __must_check_fn(co
>  
>  #define return_ptr(p)	return no_free_ptr(p)
>  
> +#define retain_ptr(p)				\
> +	__get_and_null(p, NULL)
Single line?

This sort of thing got discussed in the past though I doubt I can find
the thread. There was some push back but maybe now is it's time!

Probably worth shouting about it a bit to attract attention. Maybe
a separate patch.

Jonathan