Hello, On Mon, Dec 19, 2022 at 11:18:19PM +0100, Uwe Kleine-König wrote: > On Wed, Oct 26, 2022 at 07:23:35PM +0200, Uwe Kleine-König wrote: > > On Wed, Oct 26, 2022 at 05:09:40PM +0100, James Morse wrote: > > > On 18/10/2022 10:35, Lorenzo Pieralisi wrote: > > > > On Fri, Oct 14, 2022 at 06:06:23PM +0200, Uwe Kleine-K�nig wrote: > > > >> Returning an error value in a platform driver's remove callback results in > > > >> a generic error message being emitted by the driver core, but otherwise it > > > >> doesn't make a difference. The device goes away anyhow. > > > >> > > > >> So instead of triggering the generic platform error message, emit a more > > > >> helpful message if a problem occurs and return 0 to suppress the generic > > > >> message. > > > >> > > > >> This patch is a preparation for making platform remove callbacks return > > > >> void. > > > > > > > > If that's the plan - I don't have anything against this patch. > > > > > > > >> Signed-off-by: Uwe Kleine-K�nig <u.kleine-koenig@xxxxxxxxxxxxxx> > > > >> --- > > > >> Hello, > > > >> > > > >> note that in the situations where the driver returned an error before > > > >> and now emits a message, there is a resource leak. Someone who knows > > > >> more about this driver and maybe even can test stuff, might want to > > > >> address this. This might not only be about non-freed memory, the device > > > >> disappears but it is kept in sdei_list and so might be used after being > > > >> gone. > > > > > > > I'd need James' input on this. I guess we may ignore > > > > sdei_event_disable() return value and continue anyway in agdi_remove(), > > > > whether that's the right thing to do it is a different question. > > > > > > The unregister stuff is allowed to fail if the event is 'in progress' on another CPU. > > > Given the handler panic()s the machine, if an event is in progress, the resource leak > > > isn't something worth worrying about. The real problem is that the handler code may be > > > free()d while another CPU is still executing it, which is only a problem for modules. > > > > > > As this thing can't be built as a module, and the handler panic()s the machine, I don't > > > think there is going to be a problem here. > > > > Is that an Ack? > > This patch wasn't applied anywhere (at least it didn't appear in next > since October). Did it fell through the cracks? Is there anything > missing? gentle ping! Working on making struct platform_driver::remove() return void, I'd like to base another patch on top of this one. For that it would be great if it entered the mainline ... Thanks for considering, Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | https://www.pengutronix.de/ |
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