From 05ec62a106a3b358cdc6ac41025b320dc2dbcb3f Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Tue, 3 Oct 2017 11:35:38 +0300 Subject: [PATCH] dmaengine: omap-dma: Implement protection for invalid max_burst the device's max_burst to 16777215 (EN is 24bit unsigned value) so clients can take this into consideration when setting up the transfer. During slave transfer preparation check if the requested maxburst is valid. Signed-off-by: Peter Ujfalusi Cc: Russell King Signed-off-by: Vinod Koul --- drivers/dma/omap-dma.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c index 8c1665c8fe33..f6dd849159d8 100644 --- a/drivers/dma/omap-dma.c +++ b/drivers/dma/omap-dma.c @@ -1288,6 +1288,10 @@ static int omap_dma_slave_config(struct dma_chan *chan, struct dma_slave_config cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) return -EINVAL; + if (cfg->src_maxburst > chan->device->max_burst || + cfg->dst_maxburst > chan->device->max_burst) + return -EINVAL; + memcpy(&c->cfg, cfg, sizeof(c->cfg)); return 0; @@ -1482,6 +1486,7 @@ static int omap_dma_probe(struct platform_device *pdev) od->ddev.dst_addr_widths = OMAP_DMA_BUSWIDTHS; od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + od->ddev.max_burst = SZ_16M - 1; /* CCEN: 24bit unsigned */ od->ddev.dev = &pdev->dev; INIT_LIST_HEAD(&od->ddev.channels); spin_lock_init(&od->lock);