Re: [PATCH] spi: synquacer: Disable clock in probe error path

[Lukas Wunner <lukas@wunner.de>]

On Mon, Nov 09, 2020 at 04:22:38PM +0200, Andy Shevchenko wrote:
> On Mon, Nov 9, 2020 at 12:52 AM Lukas Wunner <lukas@wunner.de> wrote:
> > If the calls to platform_get_irq() or devm_request_irq() fail on probe
> > of the SynQuacer SPI driver, the clock "sspi->clk" is erroneously not
> > unprepared and disabled.
> >
> > If the clock rate "master->max_speed_hz" cannot be determined, the same
> > happens and in addition the spi_master struct is not freed.
> 
> Wouldn't be better to switch over devm_add_action_or_reset() in such cases?

I'd rather prefer a devm_clk_prepare_enable().  This is common enough
to merit a function of its own.

As for the spi_master struct being leaked:  I'm about to submit
a series which introduces devm_spi_alloc_master/slave() and uses
that to fix a use-after-free in 9 drivers and an spi_master leak
in 8 drivers.  Patches are on this development branch:

https://github.com/l1k/linux/commits/spi_fixes

I'm too busy with this series to also look into adding a
devm_clk_prepare_enable().  Hopefully someone else can do that.

Thanks,

Lukas