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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2017-10-03 11:35:37 +0300
committerVinod Koul <vinod.koul@intel.com>2017-10-12 22:13:06 +0530
commitea09ea51ddb9c5026e3f2090598049302c194427 (patch)
tree01314c2cab163f8b6602836c9635937bbac20893 /drivers/dma
parent2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e (diff)
dmaengine: edma: Implement protection for invalid max_burst
the device's max_burst to 32767 (CIDX is 16bit signed 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 <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/edma.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 3879f80a4815..6970355abdc9 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -891,6 +891,10 @@ static int edma_slave_config(struct dma_chan *chan,
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(&echan->cfg, cfg, sizeof(echan->cfg));
return 0;
@@ -1855,6 +1859,7 @@ static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode)
s_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
s_ddev->directions |= (BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV));
s_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+ s_ddev->max_burst = SZ_32K - 1; /* CIDX: 16bit signed */
s_ddev->dev = ecc->dev;
INIT_LIST_HEAD(&s_ddev->channels);