of: add a function to remove an of_fixup
This function is needed when a device that already registered a fixup in the probe routine fails later to probe completely. Without unregistering the fixup the function might later be called with invalid data. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -159,6 +159,25 @@ int of_register_fixup(int (*fixup)(struct device_node *, void *), void *context)
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return 0;
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}
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/*
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* Remove a previously registered fixup. Only the first (if any) is removed.
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* Returns 0 if a match was found (and removed), -ENOENT otherwise.
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*/
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int of_unregister_fixup(int (*fixup)(struct device_node *, void *),
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void *context)
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{
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struct of_fixup *of_fixup;
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list_for_each_entry(of_fixup, &of_fixup_list, list) {
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if (of_fixup->fixup == fixup && of_fixup->context == context) {
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list_del(&of_fixup->list);
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return 0;
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}
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}
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return -ENOENT;
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}
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/*
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* Apply registered fixups for the given fdt. The fdt must have
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* enough free space to apply the fixups.
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@ -243,6 +243,7 @@ struct device_d *of_find_device_by_node_path(const char *path);
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#define OF_FIND_PATH_FLAGS_BB 1 /* return .bb device if available */
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int of_find_path(struct device_node *node, const char *propname, char **outpath, unsigned flags);
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int of_register_fixup(int (*fixup)(struct device_node *, void *), void *context);
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int of_unregister_fixup(int (*fixup)(struct device_node *, void *), void *context);
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struct device_node *of_find_node_by_alias(struct device_node *root,
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const char *alias);
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struct device_node *of_find_node_by_path_or_alias(struct device_node *root,
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