[PATCH 4.4 25/91] regulator: Fix regulator_summary for deviceless consumers

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Leonard Crestez <leonard.cres...@nxp.com>

commit e42a46b6f52473661ad192f76a128a68fe301df4 upstream.

It is allowed to call regulator_get with a NULL dev argument
(_regulator_get explicitly checks for it) but this causes an error later
when printing /sys/kernel/debug/regulator_summary.

Fix this by explicitly handling "deviceless" consumers in the debugfs code.

Signed-off-by: Leonard Crestez <leonard.cres...@nxp.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/regulator/core.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -4273,12 +4273,13 @@ static void regulator_summary_show_subtr
        seq_puts(s, "\n");
 
        list_for_each_entry(consumer, &rdev->consumer_list, list) {
-               if (consumer->dev->class == &regulator_class)
+               if (consumer->dev && consumer->dev->class == &regulator_class)
                        continue;
 
                seq_printf(s, "%*s%-*s ",
                           (level + 1) * 3 + 1, "",
-                          30 - (level + 1) * 3, dev_name(consumer->dev));
+                          30 - (level + 1) * 3,
+                          consumer->dev ? dev_name(consumer->dev) : 
"deviceless");
 
                switch (rdev->desc->type) {
                case REGULATOR_VOLTAGE: