[PATCH] compat: Fixes missing sem member in struct device for RT PREEMPT prior to 2.6.34

[Blaise Gassend <blaise@xxxxxxxxxxxxxxxx>]

The RT PREEMPT patch eliminates the sem member in struct device
breaking device_lock, device_unlock and device_trylock in kernels
prior to 2.6.34. The attached patch replaces the use of sem by a use
of mutex.

Signed-off-by: Blaise Gassend <blaise@xxxxxxxxxxxxxxxx>

diff --git a/include/linux/compat-2.6.34.h b/include/linux/compat-2.6.34.h
index 336c61b..5604c7e 100644
--- a/include/linux/compat-2.6.34.h
+++ b/include/linux/compat-2.6.34.h
@@ -142,17 +142,32 @@ do {

 static inline void device_lock(struct device *dev)
 {
+#if defined(CONFIG_NONE) || defined(CONFIG_PREEMPT_RT) || \
+    defined(CONFIG_PREEMPT_VOLUNTARY) || defined(CONFIG_PREEMPT_DESKTOP)
+        mutex_lock(&dev->parent->mutex);
+#else
        down(&dev->sem);
+#endif
 }

 static inline int device_trylock(struct device *dev)
 {
+#if defined(CONFIG_NONE) || defined(CONFIG_PREEMPT_RT) || \
+    defined(CONFIG_PREEMPT_VOLUNTARY) || defined(CONFIG_PREEMPT_DESKTOP)
+        return mutex_trylock(&dev->mutex);
+#else
        return down_trylock(&dev->sem);
+#endif
 }

 static inline void device_unlock(struct device *dev)
 {
+#if defined(CONFIG_NONE) || defined(CONFIG_PREEMPT_RT) || \
+    defined(CONFIG_PREEMPT_VOLUNTARY) || defined(CONFIG_PREEMPT_DESKTOP)
+        mutex_unlock(&dev->mutex);
+#else
        up(&dev->sem);
+#endif
 }

 #if defined(CONFIG_PCMCIA) || defined(CONFIG_PCMCIA_MODULE)
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