linux-kernel - [PATCH v4 5/7] dmaengine: imx-sdma: remove the maximum limitation for bd numbers

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Message-Id: <1528984982-5074-6-git-send-email-yibin.gong@nxp.com>
Date:   Thu, 14 Jun 2018 22:03:00 +0800
From:   Robin Gong <yibin.gong@....com>
To:     vkoul@...nel.org, s.hauer@...gutronix.de, l.stach@...gutronix.de,
        dan.j.williams@...el.com, gregkh@...uxfoundation.org,
        jslaby@...e.com
Cc:     linux-serial@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-imx@....com
Subject: [PATCH v4 5/7] dmaengine: imx-sdma: remove the maximum limitation for bd numbers

No this limitation now after virtual dma used since bd is allocated
dynamically instead of static.

Signed-off-by: Robin Gong <yibin.gong@....com>
---
 drivers/dma/imx-sdma.c | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 27b76eb..f56226f 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -292,7 +292,6 @@ struct sdma_context_data {
 	u32  scratch7;
 } __attribute__ ((packed));
 
-#define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor))
 
 struct sdma_engine;
 
@@ -1297,13 +1296,6 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
 	if (ret)
 		goto err_bd_out;
 
-	if (sg_len > NUM_BD) {
-		dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
-				channel, sg_len, NUM_BD);
-		ret = -EINVAL;
-		goto err_bd_out;
-	}
-
 	desc->chn_count = 0;
 	for_each_sg(sgl, sg, sg_len, i) {
 		struct sdma_buffer_descriptor *bd = &desc->bd[i];
@@ -1413,12 +1405,6 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
 	if (ret)
 		goto err_bd_out;
 
-	if (num_periods > NUM_BD) {
-		dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
-				channel, num_periods, NUM_BD);
-		goto err_bd_out;
-	}
-
 	if (period_len > 0xffff) {
 		dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %zu > %d\n",
 				channel, period_len, 0xffff);
-- 
2.7.4