From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: [patch 43/54] Staging: hv: make RingInfo->RingLock a real spinlock Date: Fri, 17 Jul 2009 11:09:33 -0700 Message-ID: <20090717180922.909597625@mini.kroah.org> References: <20090717180850.873962925@mini.kroah.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline; filename=staging-hv-make-ringinfo-ringlock-a-real-spinlock.patch In-Reply-To: <20090720160025.GA20249@kroah.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org, virtualization@lists.osdl.org Cc: Sam Ramji , Haiyang Zhang , shemminger@linux-foundation.org List-Id: virtualization@lists.linuxfoundation.org From: Greg Kroah-Hartman 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 Cc: Haiyang Zhang Signed-off-by: Greg Kroah-Hartman --- drivers/staging/hv/RingBuffer.c | 24 +++++++++++++----------- drivers/staging/hv/RingBuffer.h | 2 +- 2 files changed, 14 insertions(+), 12 deletions(-) --- 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 !!", 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 !!", 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; } --- 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;