Merge remote-tracking branch 'spi/topic/bfin' into spi-next

[karo-tx-linux.git] / drivers / spi / spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index e57e9acd75cbf8d42813b728e8dad3137d984ff8..f7d792366b6af7dc1d52d0774eddcc62dcf311bd 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1245,6 +1245,41 @@ done:
 }
 EXPORT_SYMBOL_GPL(spi_register_master);
 
+static void devm_spi_unregister(struct device *dev, void *res)
+{
+       spi_unregister_master(*(struct spi_master **)res);
+}
+
+/**
+ * dev_spi_register_master - register managed SPI master controller
+ * @dev:    device managing SPI master
+ * @master: initialized master, originally from spi_alloc_master()
+ * Context: can sleep
+ *
+ * Register a SPI device as with spi_register_master() which will
+ * automatically be unregister
+ */
+int devm_spi_register_master(struct device *dev, struct spi_master *master)
+{
+       struct spi_master **ptr;
+       int ret;
+
+       ptr = devres_alloc(devm_spi_unregister, sizeof(*ptr), GFP_KERNEL);
+       if (!ptr)
+               return -ENOMEM;
+
+       ret = spi_register_master(master);
+       if (ret != 0) {
+               *ptr = master;
+               devres_add(dev, ptr);
+       } else {
+               devres_free(ptr);
+       }
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(devm_spi_register_master);
+
 static int __unregister(struct device *dev, void *null)
 {
        spi_unregister_device(to_spi_device(dev));