Fix race condition in omap_request_dma()

Commit Message

HU TAO-TGHK48 Oct. 30, 2009, 3:30 a.m. UTC

None

Patch

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index cd53b28..6895484 100755
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -749,11 +749,13 @@  int omap_request_dma(int dev_id, const char
*dev_name,
 	}
 
 	if (cpu_class_is_omap2()) {
+		spin_lock_irqsave(&dma_chan_lock, flags);
 		omap2_enable_irq_lch(free_ch);
 		omap_enable_channel_irq(free_ch);
 		/* Clear the CSR register and IRQ status register */
 		dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(free_ch));
 		dma_write(1 << free_ch, IRQSTATUS_L0);
+		spin_unlock_irqrestore(&dma_chan_lock, flags);
 	}