From b0afd8f68adf6a9b671b0420ab9116a36409ef7f Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 2 Dec 2012 14:48:50 +0100 Subject: [PATCH] mmc: sdio: Add empty bus-level suspend/resume callbacks Suspend methods provided by SDIO drivers are not supposed to be called by the PM core. Instead, when the SDIO core gets to suspend a device's ancestor, it calls the device driver's suspend routine. However, the PM core executes suspend callback routines directly for device drivers whose bus types don't provide suspend callbacks. In consequece, because the SDIO bus type doesn't provide a suspend callback, the SDIO drivers' suspend routines will be executed by the PM core (which shouldn't happen). To prevent this from happening, add empty system suspend/resume callbacks for the SDIO bus type. An analogous change had been made already by commit (e841a7c mmc: sdio: Use empty system suspend/resume callbacks at the bus level), but then it was reverted inadvertently by commit (d8e2ac3 mmc: sdio: Fix PM_SLEEP related build warnings) that attempted to fix build warnings introduced by commit e841a7c. Reported-by: NeilBrown Signed-off-by: Rafael J. Wysocki Signed-off-by: Chris Ball --- drivers/mmc/core/sdio_bus.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c index 6bf6879..fc2d94a 100644 --- a/drivers/mmc/core/sdio_bus.c +++ b/drivers/mmc/core/sdio_bus.c @@ -193,7 +193,21 @@ static int sdio_bus_remove(struct device *dev) } #ifdef CONFIG_PM + +#ifdef CONFIG_PM_SLEEP +static int pm_no_operation(struct device *dev) +{ + /* + * Prevent the PM core from calling SDIO device drivers' suspend + * callback routines, which it is not supposed to do, by using this + * empty function as the bus type suspend callaback for SDIO. + */ + return 0; +} +#endif + static const struct dev_pm_ops sdio_bus_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_no_operation, pm_no_operation) SET_RUNTIME_PM_OPS( pm_generic_runtime_suspend, pm_generic_runtime_resume, -- 2.7.4