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staging: fsl-mc: add counter to track number of root DPRCs

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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: Itai Katz <itai.katz@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Itai Katz 2015-10-04 10:09:53 +03:00 committed by Greg Kroah-Hartman
parent e4ea40f98d
commit 565b94506f
1 changed files with 11 additions and 2 deletions
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13
drivers/staging/fsl-mc/bus/mc-bus.c
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@ -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)