Commit 2efd7f6e authored by Nathan Lynch's avatar Nathan Lynch Committed by Michael Ellerman
Browse files

powerpc/pseries/mobility: refactor node lookup during DT update 



In pseries_devicetree_update(), with each call to ibm,update-nodes the
partition firmware communicates the node to be deleted or updated by
placing its phandle in the work buffer. Each of delete_dt_node(),
update_dt_node(), and add_dt_node() have duplicate lookups using the
phandle value and corresponding refcount management.

Move the lookup and of_node_put() into pseries_devicetree_update(),
and emit a warning on any failed lookups.

Signed-off-by: default avatarNathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201207215200.1785968-29-nathanl@linux.ibm.com
parent 87b57ea7

arch/powerpc/platforms/pseries/mobility.c

+17 −32
Original line number Diff line number Diff line
@@ -61,18 +61,10 @@ static int mobility_rtas_call(int token, char *buf, s32 scope) 
	return rc;

}



static int delete_dt_node(__be32 phandle)

static int delete_dt_node(struct device_node *dn)

{

	struct device_node *dn;



	dn = of_find_node_by_phandle(be32_to_cpu(phandle));

	if (!dn)

		return -ENOENT;



	pr_debug("removing node %pOFfp\n", dn);



	dlpar_detach_node(dn);

	of_node_put(dn);

	return 0;

}
@@ -137,10 +129,9 @@ static int update_dt_property(struct device_node *dn, struct property **prop, 
	return 0;

}



static int update_dt_node(__be32 phandle, s32 scope)

static int update_dt_node(struct device_node *dn, s32 scope)

{

	struct update_props_workarea *upwa;

	struct device_node *dn;

	struct property *prop = NULL;

	int i, rc, rtas_rc;

	char *prop_data;
@@ -157,14 +148,8 @@ static int update_dt_node(__be32 phandle, s32 scope) 
	if (!rtas_buf)

		return -ENOMEM;



	dn = of_find_node_by_phandle(be32_to_cpu(phandle));

	if (!dn) {

		kfree(rtas_buf);

		return -ENOENT;

	}



	upwa = (struct update_props_workarea *)&rtas_buf[0];

	upwa->phandle = phandle;

	upwa->phandle = cpu_to_be32(dn->phandle);



	do {

		rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf,
@@ -224,26 +209,18 @@ static int update_dt_node(__be32 phandle, s32 scope) 
		cond_resched();

	} while (rtas_rc == 1);



	of_node_put(dn);

	kfree(rtas_buf);

	return 0;

}



static int add_dt_node(__be32 parent_phandle, __be32 drc_index)

static int add_dt_node(struct device_node *parent_dn, __be32 drc_index)

{

	struct device_node *dn;

	struct device_node *parent_dn;

	int rc;



	parent_dn = of_find_node_by_phandle(be32_to_cpu(parent_phandle));

	if (!parent_dn)

		return -ENOENT;



	dn = dlpar_configure_connector(drc_index, parent_dn);

	if (!dn) {

		of_node_put(parent_dn);

	if (!dn)

		return -ENOENT;

	}



	rc = dlpar_attach_node(dn, parent_dn);

	if (rc)
@@ -251,7 +228,6 @@ static int add_dt_node(__be32 parent_phandle, __be32 drc_index) 


	pr_debug("added node %pOFfp\n", dn);



	of_node_put(parent_dn);

	return rc;

}
@@ -284,22 +260,31 @@ int pseries_devicetree_update(s32 scope) 
			data++;



			for (i = 0; i < node_count; i++) {

				struct device_node *np;

				__be32 phandle = *data++;

				__be32 drc_index;



				np = of_find_node_by_phandle(be32_to_cpu(phandle));

				if (!np) {

					pr_warn("Failed lookup: phandle 0x%x for action 0x%x\n",

						be32_to_cpu(phandle), action);

					continue;

				}



				switch (action) {

				case DELETE_DT_NODE:

					delete_dt_node(phandle);

					delete_dt_node(np);

					break;

				case UPDATE_DT_NODE:

					update_dt_node(phandle, scope);

					update_dt_node(np, scope);

					break;

				case ADD_DT_NODE:

					drc_index = *data++;

					add_dt_node(phandle, drc_index);

					add_dt_node(np, drc_index);

					break;

				}



				of_node_put(np);

				cond_resched();

			}

		}