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Commit 565b9450 authored by Itai Katz's avatar Itai Katz Committed by Greg Kroah-Hartman
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staging: fsl-mc: add counter to track number of root DPRCs 



Add a counter to track the number of root DPRCs.
When this counter is greater then 0 it means that at least
one root DPRC device exists.

Signed-off-by: default avatarItai Katz <itai.katz@freescale.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e4ea40f9

drivers/staging/fsl-mc/bus/mc-bus.c

+11 −2
Original line number Diff line number Diff line
@@ -109,6 +109,8 @@ struct bus_type fsl_mc_bus_type = { 
};

EXPORT_SYMBOL_GPL(fsl_mc_bus_type);



static atomic_t root_dprc_count = ATOMIC_INIT(0);



static int fsl_mc_driver_probe(struct device *dev)

{

	struct fsl_mc_driver *mc_drv;
@@ -213,7 +215,7 @@ EXPORT_SYMBOL_GPL(fsl_mc_driver_unregister); 
 */

bool fsl_mc_bus_exists(void)

{

	return fsl_mc_bus_type.dev_root;

	return atomic_read(&root_dprc_count) > 0;

}

EXPORT_SYMBOL_GPL(fsl_mc_bus_exists);
@@ -458,6 +460,8 @@ int fsl_mc_device_add(struct dprc_obj_desc *obj_desc, 


			if (!fsl_mc_bus_exists())

				fsl_mc_bus_type.dev_root = &mc_dev->dev;



			atomic_inc(&root_dprc_count);

		}



		error = get_dprc_icid(mc_io2, obj_desc->id, &mc_dev->icid);
@@ -540,8 +544,13 @@ void fsl_mc_device_remove(struct fsl_mc_device *mc_dev) 
			mc_dev->mc_io = NULL;

		}



		if (fsl_mc_is_root_dprc(&mc_dev->dev))

		if (fsl_mc_is_root_dprc(&mc_dev->dev)) {

			fsl_mc_bus_type.dev_root = NULL;

			if (atomic_read(&root_dprc_count) > 0)

				atomic_dec(&root_dprc_count);

			else

				WARN_ON(1);

		}

	}



	if (mc_bus)