Change against v1:
Minor fix: add check return value in sdhci_suspend_host.
Fix checkpatch.pl warning
mmc: check SDIO card wake up during suspending
It is possible that SDIO card send card interrupt to wake up
system just after SDIO func driver and SDIO card firmware commit
suspend state, while system is still in suspending process and
mmc interrupt is not release yet.
Interrupt storm may happen if func driver does not notify firmware
to clear the wake up source. If func driver issue SDIO bus transaction
to have firmware clear the source and driver continue to handle the
wake up event, system may enter suspend before all transaction done.
In this case, SDIO card will not enter lower power mode never. But
system can not be wake up for only card insert/remove/interrupt irq are
listed in wake up source in SD spec. Data/command done irq can
not wake up system.
This patch check SDIO card interrupt and stop system suspend if there
are card interrupt after func driver suspend.
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