linux-kernel - [PATCH 24/25] dmaengine: dw-edma: Skip cleanup procedure if no private data found

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Message-ID: <20220324014836.19149-25-Sergey.Semin@baikalelectronics.ru>
Date:   Thu, 24 Mar 2022 04:48:35 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        <linux-pci@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 24/25] dmaengine: dw-edma: Skip cleanup procedure if no private data found

DW eDMA driver private data is preserved in the passed DW eDMA chip info
structure. If either probe procedure failed or for some reason the passed
info object doesn't have private data pointer initialized we need to halt
the DMA device cleanup procedure in order to prevent possible system
crashes.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
---
 drivers/dma/dw-edma/dw-edma-core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index ca5cd7c99571..b932682a8ba8 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -1030,6 +1030,10 @@ int dw_edma_remove(struct dw_edma_chip *chip)
 	struct dw_edma *dw = chip->dw;
 	int i;
 
+	/* Skip removal if no private data found */
+	if (!dw)
+		return -ENODEV;
+
 	/* Disable eDMA */
 	dw_edma_v0_core_off(dw);
 
-- 
2.35.1