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of: dynamic: Refactor action prints to not use "%pOF" inside devtree_lock

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While originally it was fine to format strings using "%pOF" while
holding devtree_lock, this now causes a deadlock.  Lockdep reports:

    of_get_parent from of_fwnode_get_parent+0x18/0x24
    ^^^^^^^^^^^^^
    of_fwnode_get_parent from fwnode_count_parents+0xc/0x28
    fwnode_count_parents from fwnode_full_name_string+0x18/0xac
    fwnode_full_name_string from device_node_string+0x1a0/0x404
    device_node_string from pointer+0x3c0/0x534
    pointer from vsnprintf+0x248/0x36c
    vsnprintf from vprintk_store+0x130/0x3b4

Fix this by moving the printing in __of_changeset_entry_apply() outside
the lock. As the only difference in the multiple prints is the action
name, use the existing "action_names" to refactor the prints into a
single print.

Fixes: a92eb7621b ("lib/vsprintf: Make use of fwnode API to obtain node names and separators")
Cc: stable@vger.kernel.org
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230801-dt-changeset-fixes-v3-2-5f0410e007dd@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Rob Herring 2023-08-18 15:40:57 -05:00
parent 0aeae3788e
commit 914d9d831e
1 changed files with 9 additions and 22 deletions
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31
drivers/of/dynamic.c
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@ -63,15 +63,14 @@ int of_reconfig_notifier_unregister(struct notifier_block *nb)
}
EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister);
#ifdef DEBUG
const char *action_names[] = {
static const char *action_names[] = {
[0] = "INVALID",
[OF_RECONFIG_ATTACH_NODE] = "ATTACH_NODE",
[OF_RECONFIG_DETACH_NODE] = "DETACH_NODE",
[OF_RECONFIG_ADD_PROPERTY] = "ADD_PROPERTY",
[OF_RECONFIG_REMOVE_PROPERTY] = "REMOVE_PROPERTY",
[OF_RECONFIG_UPDATE_PROPERTY] = "UPDATE_PROPERTY",
};
#endif
int of_reconfig_notify(unsigned long action, struct of_reconfig_data *p)
{
@ -620,21 +619,9 @@ static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
}
ret = __of_add_property(ce->np, ce->prop);
if (ret) {
pr_err("changeset: add_property failed @%pOF/%s\n",
ce->np,
ce->prop->name);
break;
}
break;
case OF_RECONFIG_REMOVE_PROPERTY:
ret = __of_remove_property(ce->np, ce->prop);
if (ret) {
pr_err("changeset: remove_property failed @%pOF/%s\n",
ce->np,
ce->prop->name);
break;
}
break;
case OF_RECONFIG_UPDATE_PROPERTY:
@ -648,20 +635,17 @@ static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
}
ret = __of_update_property(ce->np, ce->prop, &old_prop);
if (ret) {
pr_err("changeset: update_property failed @%pOF/%s\n",
ce->np,
ce->prop->name);
break;
}
break;
default:
ret = -EINVAL;
}
raw_spin_unlock_irqrestore(&devtree_lock, flags);
if (ret)
if (ret) {
pr_err("changeset: apply failed: %-15s %pOF:%s\n",
action_names[ce->action], ce->np, ce->prop->name);
return ret;
}
switch (ce->action) {
case OF_RECONFIG_ATTACH_NODE:
@ -947,6 +931,9 @@ int of_changeset_action(struct of_changeset *ocs, unsigned long action,
if (!ce)
return -ENOMEM;
if (WARN_ON(action >= ARRAY_SIZE(action_names)))
return -EINVAL;
/* get a reference to the node */
ce->action = action;
ce->np = of_node_get(np);