From aef5fe3054f15de121b64f8234974cbc134fa709 Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Tue, 7 Apr 2009 10:24:52 -0700 Subject: [PATCH] [OMAP,sDMA] Fix for possible race condition in omap_free_dma() Fix the possible race condition in omap_free_dma(). Function omap_free_dma() sets the dev_id = -1 and then accesses the channel afterwards to clear it. But setting the dev_id=-1 makes the channel available for allocation again. So it is possible someone else can grab it and results are unpredictable. To avod this DMA channle is cleared first and then the dev_id = -1 is set. Thanks to McNeil, Sean for ointing out this issue. Signed-off-by: Santosh Shilimkar Signed-off-by: Tony Lindgren --- arch/arm/plat-omap/dma.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c index 9c71cbb498c..559cbb53744 100644 --- a/arch/arm/plat-omap/dma.c +++ b/arch/arm/plat-omap/dma.c @@ -760,19 +760,12 @@ void omap_free_dma(int lch) { unsigned long flags; - spin_lock_irqsave(&dma_chan_lock, flags); if (dma_chan[lch].dev_id == -1) { pr_err("omap_dma: trying to free unallocated DMA channel %d\n", lch); - spin_unlock_irqrestore(&dma_chan_lock, flags); return; } - dma_chan[lch].dev_id = -1; - dma_chan[lch].next_lch = -1; - dma_chan[lch].callback = NULL; - spin_unlock_irqrestore(&dma_chan_lock, flags); - if (cpu_class_is_omap1()) { /* Disable all DMA interrupts for the channel. */ dma_write(0, CICR(lch)); @@ -798,6 +791,12 @@ void omap_free_dma(int lch) dma_write(0, CCR(lch)); omap_clear_dma(lch); } + + spin_lock_irqsave(&dma_chan_lock, flags); + dma_chan[lch].dev_id = -1; + dma_chan[lch].next_lch = -1; + dma_chan[lch].callback = NULL; + spin_unlock_irqrestore(&dma_chan_lock, flags); } EXPORT_SYMBOL(omap_free_dma); -- 2.41.0