[RFC 2/6] pseries/drcinfo: Fix bug parsing ibm,drc-info

[Michael Bringmann]

Replace use of of_prop_next_u32() in when parsing 'ibm,drc-info'
structure to simplify and reduce parsing code.

Signed-off-by: Michael Bringmann <m...@linux.vnet.ibm.com>
Fixes: 3f38000eda48 ("powerpc/firmware: Add definitions for new drc-info 
firmware feature" -- end of patch series applied to powerpc next)
---
 arch/powerpc/platforms/pseries/of_helpers.c |   24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/of_helpers.c 
b/arch/powerpc/platforms/pseries/of_helpers.c
index 6df192f..0185e50 100644
--- a/arch/powerpc/platforms/pseries/of_helpers.c
+++ b/arch/powerpc/platforms/pseries/of_helpers.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+
 #include <linux/string.h>
 #include <linux/err.h>
 #include <linux/slab.h>
@@ -6,6 +7,9 @@
 #include <asm/prom.h>
 
 #include "of_helpers.h"
+#include "pseries.h"
+
+#define        MAX_DRC_NAME_LEN 64
 
 /**
  * pseries_of_derive_parent - basically like dirname(1)
@@ -65,29 +69,19 @@ int of_read_drc_info_cell(struct property **prop, const 
__be32 **curval,
 
        /* Get drc-index-start:encode-int */
        p2 = (const __be32 *)p;
-       p2 = of_prop_next_u32(*prop, p2, &data->drc_index_start);
-       if (!p2)
-               return -EINVAL;
+       data->drc_index_start = of_read_number(p2++, 1);
 
        /* Get drc-name-suffix-start:encode-int */
-       p2 = of_prop_next_u32(*prop, p2, &data->drc_name_suffix_start);
-       if (!p2)
-               return -EINVAL;
+       data->drc_name_suffix_start = of_read_number(p2++, 1);
 
        /* Get number-sequential-elements:encode-int */
-       p2 = of_prop_next_u32(*prop, p2, &data->num_sequential_elems);
-       if (!p2)
-               return -EINVAL;
+       data->num_sequential_elems = of_read_number(p2++, 1);
 
        /* Get sequential-increment:encode-int */
-       p2 = of_prop_next_u32(*prop, p2, &data->sequential_inc);
-       if (!p2)
-               return -EINVAL;
+       data->sequential_inc = of_read_number(p2++, 1);
 
        /* Get drc-power-domain:encode-int */
-       p2 = of_prop_next_u32(*prop, p2, &data->drc_power_domain);
-       if (!p2)
-               return -EINVAL;
+       data->drc_power_domain = of_read_number(p2++, 1);
 
        /* Should now know end of current entry */
        (*curval) = (void *)p2;