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

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Message-ID: <20250116154439.3889536-3-mkumard@nvidia.com>
Date: Thu, 16 Jan 2025 21:14:39 +0530
From: Mohan Kumar D <mkumard@...dia.com>
To: <vkoul@...nel.org>, <thierry.reding@...il.com>, <jonathanh@...dia.com>
CC: <dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>, Mohan Kumar D
	<mkumard@...dia.com>
Subject: [PATCH 2/2] dmaengine: tegra210-adma: check for adma max page

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")
Signed-off-by: Mohan Kumar D <mkumard@...dia.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 258220c9cb50..393e8a8a5bc1 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,
 };
@@ -922,7 +927,7 @@ static int tegra_adma_probe(struct platform_device *pdev)
 			page_offset = lower_32_bits(res_page->start) -
 						lower_32_bits(res_base->start);
 			page_no = page_offset / cdata->ch_base_offset;
-			if (page_no == 0)
+			if (page_no == 0 || page_no > cdata->max_page)
 				return -EINVAL;
 
 			tdma->ch_page_no = page_no - 1;
-- 
2.25.1