Staging: hv: make RingInfo->RingLock a real spinlock

Don't use the wrapper functions for this lock, make it a real
lock so that we know what is going on.

I don't think we really want to be doing a irqsave for this code, but I
left it alone to preserve the original codepath.  It should be reviewed
later.

Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 14 insertions, 12 deletions

diff --git a/drivers/staging/hv/RingBuffer.c b/drivers/staging/hv/RingBuffer.c
index 34d4adaa19b..21fc4cc6326 100644
--- a/drivers/staging/hv/RingBuffer.c
+++ b/drivers/staging/hv/RingBuffer.c
@@ -315,7 +315,7 @@ RingBufferInit(
         RingInfo->RingSize = BufferLen;
         RingInfo->RingDataSize = BufferLen - sizeof(RING_BUFFER);
 
-        RingInfo->RingLock = SpinlockCreate();
+        spin_lock_init(&RingInfo->ring_lock);
 
         return 0;
 }
@@ -334,7 +334,6 @@ RingBufferCleanup(
         RING_BUFFER_INFO* RingInfo
         )
 {
-        SpinlockClose(RingInfo->RingLock);
 }
 
 /*++
@@ -360,6 +359,7 @@ RingBufferWrite(
 
         volatile u32 nextWriteLocation;
         u64 prevIndices=0;
+        unsigned long flags;
 
         DPRINT_ENTER(VMBUS);
 
@@ -370,7 +370,7 @@ RingBufferWrite(
 
         totalBytesToWrite += sizeof(u64);
 
-        SpinlockAcquire(OutRingInfo->RingLock);
+        spin_lock_irqsave(&OutRingInfo->ring_lock, flags);
 
         GetRingBufferAvailBytes(OutRingInfo, &byteAvailToRead, &byteAvailToWrite);
 
@@ -384,7 +384,7 @@ RingBufferWrite(
         {
                 DPRINT_DBG(VMBUS, "No more space left on outbound ring buffer (needed %u, avail %u)", totalBytesToWrite, byteAvailToWrite);
 
-                SpinlockRelease(OutRingInfo->RingLock);
+                spin_unlock_irqrestore(&OutRingInfo->ring_lock, flags);
 
                 DPRINT_EXIT(VMBUS);
 
@@ -418,7 +418,7 @@ RingBufferWrite(
 
         //DumpRingInfo(OutRingInfo, "AFTER ");
 
-        SpinlockRelease(OutRingInfo->RingLock);
+        spin_unlock_irqrestore(&OutRingInfo->ring_lock, flags);
 
         DPRINT_EXIT(VMBUS);
 
@@ -445,8 +445,9 @@ RingBufferPeek(
         u32 bytesAvailToWrite;
         u32 bytesAvailToRead;
         u32 nextReadLocation=0;
+        unsigned long flags;
 
-        SpinlockAcquire(InRingInfo->RingLock);
+        spin_lock_irqsave(&InRingInfo->ring_lock, flags);
 
         GetRingBufferAvailBytes(InRingInfo, &bytesAvailToRead, &bytesAvailToWrite);
 
@@ -455,7 +456,7 @@ RingBufferPeek(
         {
                 //DPRINT_DBG(VMBUS, "got callback but not enough to read <avail to read %d read size %d>!!", bytesAvailToRead, BufferLen);
 
-                SpinlockRelease(InRingInfo->RingLock);
+                spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
 
                 return -1;
         }
@@ -468,7 +469,7 @@ RingBufferPeek(
                                                                                         BufferLen,
                                                                                         nextReadLocation);
 
-        SpinlockRelease(InRingInfo->RingLock);
+        spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
 
         return 0;
 }
@@ -495,10 +496,11 @@ RingBufferRead(
         u32 bytesAvailToRead;
         u32 nextReadLocation=0;
         u64 prevIndices=0;
+        unsigned long flags;
 
         ASSERT(BufferLen > 0);
 
-        SpinlockAcquire(InRingInfo->RingLock);
+        spin_lock_irqsave(&InRingInfo->ring_lock, flags);
 
         GetRingBufferAvailBytes(InRingInfo, &bytesAvailToRead, &bytesAvailToWrite);
 
@@ -511,7 +513,7 @@ RingBufferRead(
         {
                 DPRINT_DBG(VMBUS, "got callback but not enough to read <avail to read %d read size %d>!!", bytesAvailToRead, BufferLen);
 
-                SpinlockRelease(InRingInfo->RingLock);
+                spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
 
                 return -1;
         }
@@ -537,7 +539,7 @@ RingBufferRead(
 
         //DumpRingInfo(InRingInfo, "AFTER ");
 
-        SpinlockRelease(InRingInfo->RingLock);
+        spin_unlock_irqrestore(&InRingInfo->ring_lock, flags);
 
         return 0;
 }
diff --git a/drivers/staging/hv/RingBuffer.h b/drivers/staging/hv/RingBuffer.h
index ba2d8a9455e..4217259890b 100644
--- a/drivers/staging/hv/RingBuffer.h
+++ b/drivers/staging/hv/RingBuffer.h
@@ -48,7 +48,7 @@ typedef struct _RING_BUFFER {
 typedef struct _RING_BUFFER_INFO {
     RING_BUFFER*        RingBuffer;
     u32                 RingSize;                       // Include the shared header
-        HANDLE                  RingLock;
+        spinlock_t ring_lock;
 
     u32                 RingDataSize;           // < ringSize
         u32                     RingDataStartOffset;