Enabling CONFIG_MMC_UNSAFE_RESUME

[Josh Boyer]

On Thu, Feb 6, 2014 at 10:02 AM, Hans de Goede <hdegoede at redhat.com> wrote:
> Hi,
>
> The mmc subsys has a Kconfig option which more or less mirrors
> CONFIG_USB_DEFAULT_PERSIST, which Fedora enables.
>
> I would like to suggest to enable the MMC variant too, without
> this on suspend / resume, the kernel will assume that the card
> was swapped by one which happens to be of exactly the same type,
> thus forcing an unmount off any fs which was on it and killing
> any apps which happen to have files open on the device.
>
> For ARM where the rootfs often is on an sdcard this is disastrous,
> but one PC-s it is not really userfriendly to kill any fs on
> an sdcard on suspend / resume either.
>
> Therefor I would like to suggest that we start enabling
> CONFIG_MMC_UNSAFE_RESUME just like we do for
> CONFIG_USB_DEFAULT_PERSIST, note that despite the "scary"
> naming they are in essence pretty much the same, assume if the
> same device is still present after suspend / resume, that it
> really is the same device even though we cannot be 100.1 % sure.

OK.  I'll enable this in rawhide today.

josh