linux-kernel - [PATCH] dmaengine: stm32-mdma: Remove dead code in stm32_mdma_irq

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Date:   Mon, 13 Jun 2022 01:23:58 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Vinod Koul <vkoul@...nel.org>,
        Amelie Delaunay <amelie.delaunay@...com>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        dmaengine@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] dmaengine: stm32-mdma: Remove dead code in stm32_mdma_irq_handler()

Local variable chan is initialized by an address of element of chan array
that is part of stm32_mdma_device struct, so it does not make sense to
compare chan with NULL.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Fixes: a4ffb13c8946 ("dmaengine: Add STM32 MDMA driver")
---
 drivers/dma/stm32-mdma.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
index caf0cce8f528..b11927ed4367 100644
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -1328,12 +1328,7 @@ static irqreturn_t stm32_mdma_irq_handler(int irq, void *devid)
 		return IRQ_NONE;
 	}
 	id = __ffs(status);
-
 	chan = &dmadev->chan[id];
-	if (!chan) {
-		dev_warn(mdma2dev(dmadev), "MDMA channel not initialized\n");
-		return IRQ_NONE;
-	}
 
 	/* Handle interrupt for the channel */
 	spin_lock(&chan->vchan.lock);
-- 
2.7.4