[PATCH v4 2/2] dmaengine: tegra210-adma: check for adma max page

Mohan Kumar D
2025-02-05T03:32:03Z

Have additional check for max channel page during the probe
to cover if any offset overshoot happens due to wrong DT
configuration.

Fixes: 68811c928f88 ("dmaengine: tegra210-adma: Support channel page")
Cc: stable@vger.kernel.org
Signed-off-by: Mohan Kumar D <mkumard@nvidia.com>
---
drivers/dma/tegra210-adma.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
index a0bd4822ed80..801740ad8e0d 100644
--- a/drivers/dma/tegra210-adma.c
+++ b/drivers/dma/tegra210-adma.c
@@ -83,7 +83,9 @@ struct tegra_adma;
* @nr_channels: Number of DMA channels available.
* @ch_fifo_size_mask: Mask for FIFO size field.
* @sreq_index_offset: Slave channel index offset.
+ * @max_page: Maximum ADMA Channel Page.
* @has_outstanding_reqs: If DMA channel can have outstanding requests.
+ * @set_global_pg_config: Global page programming.
*/
struct tegra_adma_chip_data {
unsigned int (*adma_get_burst_config)(unsigned int burst_size);
@@ -99,6 +101,7 @@ struct tegra_adma_chip_data {
unsigned int nr_channels;
unsigned int ch_fifo_size_mask;
unsigned int sreq_index_offset;
+ unsigned int max_page;
bool has_outstanding_reqs;
void (*set_global_pg_config)(struct tegra_adma *tdma);
};
@@ -854,6 +857,7 @@ static const struct tegra_adma_chip_data tegra210_chip_data = {
.nr_channels = 22,
.ch_fifo_size_mask = 0xf,
.sreq_index_offset = 2,
+ .max_page = 0,
.has_outstanding_reqs = false,
.set_global_pg_config = NULL,
};
@@ -871,6 +875,7 @@ static const struct tegra_adma_chip_data tegra186_chip_data = {
.nr_channels = 32,
.ch_fifo_size_mask = 0x1f,
.sreq_index_offset = 4,
+ .max_page = 4,
.has_outstanding_reqs = true,
.set_global_pg_config = tegra186_adma_global_page_config,
};
@@ -921,7 +926,7 @@ static int tegra_adma_probe(struct platform_device *pdev)
page_offset = res_page->start - res_base->start;
page_no = div_u64(page_offset, cdata->ch_base_offset);

- if (WARN_ON(page_no == 0))
+ if (WARN_ON(page_no == 0 || page_no > cdata->max_page))
return -EINVAL;

tdma->ch_page_no = lower_32_bits(page_no) - 1;
--
2.25.1