On 30 May 2011 15:26, Daniel Drake <dsd@xxxxxxxxxx> wrote:
> Hi,
>
> The libertas_sdio driver has a suspend routine which returns -ENOSYS
> when the card should effectively be removed and powered during
> suspend, to be re-probed during resume.
>
> This is broken in linus master.
Actually, it only breaks when I enable runtime PM via the patch we are
discussing in the other thread.
Here is the call trace:
mmc_suspend_host
mmc_sdio_remove
sdio_remove_func
device_del
sdio_bus_remove
In sdio_bus_remove, we hit:
/* Make sure card is powered before invoking ->remove() */
if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
ret = pm_runtime_get_sync(dev);
if (ret < 0)
goto out;
}
pm_runtime_get_sync returns -11, therefore we skip the following
drv->remove call, causing this confusion. -11 is EAGAIN
Digging further, in the pm_runtime_get_sync() call we reach
rpm_resume() in drivers/base/power where we hit:
else if (dev->power.disable_depth > 0)
retval = -EAGAIN;
Not sure what this means. Any thoughts?
Thanks,
Daniel
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