Re: [linux-pm] Recent "Run the driver callback directly" patch breakslibertas suspend

From: Alan Stern
Date: Sun Mar 25 2012 - 11:18:31 EST

On Sun, 25 Mar 2012, NeilBrown wrote:

> Hi Rafael,
> Your recent patch:
> commit 35cd133c
> PM: Run the driver callback directly if the subsystem one is not there
> breaks suspend for my libertas wifi and probably other SDIO devices.
> SDIO (and possible MMC in general) has a protocol where the suspend
> method can return -ENOSYS and this means "There is no point in suspending,
> just turn me off".
> The device itself "mmc1:0001" (I think) doesn't have any bus etc 'suspend'
> function so the new code call the device's suspend function which returns
> ENOSYS and the suspend fails.
> The previous code ignores the device as there is no bus suspend, and when it
> gets to suspend the ancestor - which for me is omap_hsmmc.1, it calls the
> device suspend function catches the ENOSYS, and turns it off.
> I suspect just reverting it isn't the right long term solution, however I
> can confirm that it works for me for now.
> I'm happy to try any alternate fixes you would like to suggest (but I cannot
> promise how quickly I will get the testing done).

With a little restructuring, this might be a good application for

Alan Stern

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