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authorLee Jones <lee.jones@linaro.org>2020-08-19 09:16:50 +0100
committerLee Jones <lee.jones@linaro.org>2020-08-28 09:51:41 +0100
commit22380b65dc70f5b132c5afdf6b4011e2a84ec34a (patch)
tree3ce0c84fa4ae3730b285cde5049e5f7f38353f93
parent6b6cf2b5debd42de39afd8ac84b60faeca62cfaf (diff)
downloadlinux-sh-22380b65dc70f5b132c5afdf6b4011e2a84ec34a.tar.gz
mfd: mfd-core: Ensure disabled devices are ignored without error
Commit e49aa9a9bd22 ("mfd: core: Make a best effort attempt to match devices with the correct of_nodes") changed the semantics for disabled devices in mfd_add_device(). Instead of silently ignoring a disabled child device, an error was returned. On receipt of the error mfd_add_devices() the precedes to remove *all* child devices and returns an all-failed error to the caller, which will inevitably fail the parent device as well. This patch reverts back to the old semantics and ignores child devices which are disabled in Device Tree. Fixes: e49aa9a9bd22 ("mfd: core: Make a best effort attempt to match devices with the correct of_nodes") Reported-by: Icenowy Zheng <icenowy@aosc.io> Tested-by: Icenowy Zheng <icenowy@aosc.io> Signed-off-by: Lee Jones <lee.jones@linaro.org>
-rw-r--r--drivers/mfd/mfd-core.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index c50718e3db58..fc00aaccb5f7 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -126,10 +126,6 @@ static int mfd_match_of_node_to_dev(struct platform_device *pdev,
const __be32 *reg;
u64 of_node_addr;
- /* Skip devices 'disabled' by Device Tree */
- if (!of_device_is_available(np))
- return -ENODEV;
-
/* Skip if OF node has previously been allocated to a device */
list_for_each_entry(of_entry, &mfd_of_node_list, list)
if (of_entry->np == np)
@@ -212,6 +208,12 @@ static int mfd_add_device(struct device *parent, int id,
if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) {
for_each_child_of_node(parent->of_node, np) {
if (of_device_is_compatible(np, cell->of_compatible)) {
+ /* Ignore 'disabled' devices error free */
+ if (!of_device_is_available(np)) {
+ ret = 0;
+ goto fail_alias;
+ }
+
ret = mfd_match_of_node_to_dev(pdev, np, cell);
if (ret == -EAGAIN)
continue;