[PATCH] RFC: ARM: msm: re-read DMA IRQ status on each iteration

David et al: I'm uncertain about this one since the comment
says that the read clears the IRQ, such as if the read operation
itself will latch out the flag register and clear it. (I encountered
this behaviour in the MOS6569 VIC raster IRQ register $D019 in the
1980s if I'm not mistaken.)
---
  arch/arm/mach-msm/dma.c |    6 ++----
  1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-msm/dma.c b/arch/arm/mach-msm/dma.c
index 02cae5e..ee11afe 100644
--- a/arch/arm/mach-msm/dma.c
+++ b/arch/arm/mach-msm/dma.c

@@ -147,10 +147,8 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)

  	spin_lock_irqsave(&msm_dmov_lock, irq_flags);

-	int_status = readl(DMOV_ISR); /* read and clear interrupt */
-	PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
-
-	while (int_status) {
+	while (int_status = readl(DMOV_ISR)) {
+		PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
  		mask = int_status&  -int_status;
  		id = fls(mask) - 1;

PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, 
mask, id);