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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>
This commit is contained in:
Peter Ujfalusi 2017-10-03 11:35:37 +03:00 committed by Vinod Koul
parent 2bd6bf03f4
commit ea09ea51dd
1 changed files with 5 additions and 0 deletions
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5
drivers/dma/edma.c
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@ -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);