spi: fix double-free on spi_unregister_master

[linux-2.6-omap-h63xx.git] / drivers / spi / spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 89769ce16f882058934698ce566b804aa3a13e2d..b31f4431849b25e771d301f956b3afd31b00d2bf 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -457,10 +457,11 @@ done:
 EXPORT_SYMBOL_GPL(spi_register_master);
 
 
-static int __unregister(struct device *dev, void *unused)
+static int __unregister(struct device *dev, void *master_dev)
 {
        /* note: before about 2.6.14-rc1 this would corrupt memory: */
-       spi_unregister_device(to_spi_device(dev));
+       if (dev != master_dev)
+               spi_unregister_device(to_spi_device(dev));
        return 0;
 }
 
@@ -478,7 +479,8 @@ void spi_unregister_master(struct spi_master *master)
 {
        int dummy;
 
-       dummy = device_for_each_child(master->dev.parent, NULL, __unregister);
+       dummy = device_for_each_child(master->dev.parent, &master->dev,
+                                       __unregister);
        device_unregister(&master->dev);
 }
 EXPORT_SYMBOL_GPL(spi_unregister_master);