[POWERPC] viopath: Use completion

Use a completion instead of abusing a semaphore for hypervisor event
completion in viopath.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/arch/powerpc/platforms/iseries/viopath.c b/arch/powerpc/platforms/iseries/viopath.c
index 354b8dd2a2c1..7f58e5929a2c 100644
--- a/arch/powerpc/platforms/iseries/viopath.c
+++ b/arch/powerpc/platforms/iseries/viopath.c
@@ -37,6 +37,7 @@
 #include <linux/wait.h>
 #include <linux/seq_file.h>
 #include <linux/interrupt.h>
+#include <linux/completion.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -115,7 +116,7 @@ static int proc_viopath_show(struct seq_file *m, void *v)
         u16 vlanMap;
         dma_addr_t handle;
         HvLpEvent_Rc hvrc;
-        DECLARE_MUTEX_LOCKED(Semaphore);
+        DECLARE_COMPLETION(done);
         struct device_node *node;
         const char *sysid;
 
@@ -132,13 +133,13 @@ static int proc_viopath_show(struct seq_file *m, void *v)
                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
                         viopath_sourceinst(viopath_hostLp),
                         viopath_targetinst(viopath_hostLp),
-                        (u64)(unsigned long)&Semaphore, VIOVERSION << 16,
+                        (u64)(unsigned long)&done, VIOVERSION << 16,
                         ((u64)handle) << 32, HW_PAGE_SIZE, 0, 0);
 
         if (hvrc != HvLpEvent_Rc_Good)
                 printk(VIOPATH_KERN_WARN "hv error on op %d\n", (int)hvrc);
 
-        down(&Semaphore);
+        wait_for_completion(&done);
 
         vlanMap = HvLpConfig_getVirtualLanIndexMap();
 
@@ -353,7 +354,7 @@ static void handleConfig(struct HvLpEvent *event)
                 return;
         }
 
-        up((struct semaphore *)event->xCorrelationToken);
+        complete((struct completion *)event->xCorrelationToken);
 }
 
 /*