redonkable/remarkable-linux
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Staging: hv: make RingInfo->RingLock a real spinlock

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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>
This commit is contained in:
Greg Kroah-Hartman 2009-07-15 14:55:14 -07:00
parent 54411c425f
commit a98f96eed5
2 changed files with 14 additions and 12 deletions
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24
drivers/staging/hv/RingBuffer.c
View file

@ -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;
}

2
drivers/staging/hv/RingBuffer.h
View file

@ -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;