linux-kernel - [PATCH 3/4] DMA: tegra-apb: Remove unnecessary return statements and variables

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Message-ID: <1438867953-11378-4-git-send-email-jonathanh@nvidia.com>
Date:	Thu, 6 Aug 2015 14:32:32 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Laxman Dewangan <ldewangan@...dia.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>
CC:	<dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Jon Hunter <jonathanh@...dia.com>
Subject: [PATCH 3/4] DMA: tegra-apb: Remove unnecessary return statements and variables

Some void functions have unnecessary return statements at the end
(reported by sparse) and so remove these. Also remove the return variables
from functions tegra_dma_prep_slave_sg() and tegra_dma_prep_slave_cyclic()
because the value is not used.

Signed-off-by: Jon Hunter <jonathanh@...dia.com>
---
 drivers/dma/tegra20-apb-dma.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 11edcca7619b..53a8075dcec8 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -598,7 +598,6 @@ static void handle_once_dma_done(struct tegra_dma_channel *tdc,
 		return;
 
 	tdc_start_head_req(tdc);
-	return;
 }
 
 static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc,
@@ -625,7 +624,6 @@ static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc,
 		if (!st)
 			dma_desc->dma_status = DMA_ERROR;
 	}
-	return;
 }
 
 static void tegra_dma_tasklet(unsigned long data)
@@ -717,7 +715,6 @@ static void tegra_dma_issue_pending(struct dma_chan *dc)
 	}
 end:
 	spin_unlock_irqrestore(&tdc->lock, flags);
-	return;
 }
 
 static int tegra_dma_terminate_all(struct dma_chan *dc)
@@ -929,7 +926,6 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
 	struct tegra_dma_sg_req  *sg_req = NULL;
 	u32 burst_size;
 	enum dma_slave_buswidth slave_bw;
-	int ret;
 
 	if (!tdc->config_init) {
 		dev_err(tdc2dev(tdc), "dma channel is not configured\n");
@@ -940,9 +936,8 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
 		return NULL;
 	}
 
-	ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
-				&burst_size, &slave_bw);
-	if (ret < 0)
+	if (get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
+				&burst_size, &slave_bw) < 0)
 		return NULL;
 
 	INIT_LIST_HEAD(&req_list);
@@ -1045,7 +1040,6 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
 	dma_addr_t mem = buf_addr;
 	u32 burst_size;
 	enum dma_slave_buswidth slave_bw;
-	int ret;
 
 	if (!buf_len || !period_len) {
 		dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
@@ -1084,12 +1078,10 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
 		return NULL;
 	}
 
-	ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
-				&burst_size, &slave_bw);
-	if (ret < 0)
+	if (get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
+				&burst_size, &slave_bw) < 0)
 		return NULL;
 
-
 	ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
 	ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
 					TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
-- 
2.1.4

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