Re: [PATCH 2/2] serial: 8250_bcm7271: fix leak in `brcmuart_probe`

[Doug Berger]

On 4/27/2023 1:29 PM, Christophe JAILLET wrote:
> Le 27/04/2023 à 20:19, Doug Berger a écrit :
> > Smatch reports:
> > drivers/tty/serial/8250/8250_bcm7271.c:1120 brcmuart_probe() warn:
> > 'baud_mux_clk' from clk_prepare_enable() not released on lines: 1032.
> >
> > The issue is fixed by using a managed clock.
> >
> > Fixes: 41a469482de2 ("serial: 8250: Add new 8250-core based Broadcom 
> > STB driver")
> > Reported-by: XuDong Liu <m202071377@xxxxxxxxxxx>
> > Link: 
> > https://lore.kernel.org/lkml/20230424125100.4783-1-m202071377@xxxxxxxxxxx/
> > Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
> > ---
> >   drivers/tty/serial/8250/8250_bcm7271.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/tty/serial/8250/8250_bcm7271.c 
> > b/drivers/tty/serial/8250/8250_bcm7271.c
> > index 90ee7bc12f77..af0e1c070187 100644
> > --- a/drivers/tty/serial/8250/8250_bcm7271.c
> > +++ b/drivers/tty/serial/8250/8250_bcm7271.c
> > @@ -1012,7 +1012,7 @@ static int brcmuart_probe(struct platform_device 
> > *pdev)
> >       of_property_read_u32(np, "clock-frequency", &clk_rate);
> >       /* See if a Baud clock has been specified */
> > -    baud_mux_clk = of_clk_get_by_name(np, "sw_baud");
> > +    baud_mux_clk = devm_clk_get(dev, "sw_baud");
>
> If switching to devm_clk_get(), maybe devm_clk_get_enabled() could also 
> be an option to fix both issues and avoid adding some LoC.
>
> The order of operation in the remove function would then be different. I 
> don't know if it can be an issue.
I like the idea, but it doesn't backport to the source of the error.
I'll try to remember to submit something after the merge closes.

> Just my 2c.
>
> CJ
Thanks!
    Doug