spi: use class iteration api
Convert to use the class iteration api. Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Acked-by: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -485,6 +485,15 @@ void spi_unregister_master(struct spi_master *master)
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}
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EXPORT_SYMBOL_GPL(spi_unregister_master);
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static int __spi_master_match(struct device *dev, void *data)
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{
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struct spi_master *m;
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u16 *bus_num = data;
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m = container_of(dev, struct spi_master, dev);
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return m->bus_num == *bus_num;
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}
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/**
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* spi_busnum_to_master - look up master associated with bus_num
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* @bus_num: the master's bus number
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@ -499,17 +508,12 @@ struct spi_master *spi_busnum_to_master(u16 bus_num)
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{
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struct device *dev;
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struct spi_master *master = NULL;
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struct spi_master *m;
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down(&spi_master_class.sem);
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list_for_each_entry(dev, &spi_master_class.children, node) {
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m = container_of(dev, struct spi_master, dev);
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if (m->bus_num == bus_num) {
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master = spi_master_get(m);
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break;
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}
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}
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up(&spi_master_class.sem);
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dev = class_find_device(&spi_master_class, &bus_num,
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__spi_master_match);
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if (dev)
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master = container_of(dev, struct spi_master, dev);
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/* reference got in class_find_device */
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return master;
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}
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EXPORT_SYMBOL_GPL(spi_busnum_to_master);
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