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From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
	Vinod Koul <vkoul@kernel.org>, Rob Herring <robh@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Cai Huoqing <cai.huoqing@linux.dev>,
	Robin Murphy <robin.murphy@arm.com>,
	Jingoo Han <jingoohan1@gmail.com>, Frank Li <Frank.Li@nxp.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: "Serge Semin" <Sergey.Semin@baikalelectronics.ru>,
	"Serge Semin" <fancer.lancer@gmail.com>,
	"Alexey Malahov" <Alexey.Malahov@baikalelectronics.ru>,
	"Pavel Parkhomenko" <Pavel.Parkhomenko@baikalelectronics.ru>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	caihuoqing <caihuoqing@baidu.com>,
	linux-pci@vger.kernel.org, dmaengine@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v6 23/24] dmaengine: dw-edma: Skip cleanup procedure if no private data found
Date: Tue, 8 Nov 2022 00:04:37 +0300	[thread overview]
Message-ID: <20221107210438.1515-24-Sergey.Semin@baikalelectronics.ru> (raw)
In-Reply-To: <20221107210438.1515-1-Sergey.Semin@baikalelectronics.ru>

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@baikalelectronics.ru>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
---
 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 846518509753..a1cb022a03f4 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -1055,6 +1055,10 @@ 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);
 
-- 
2.38.0



  parent reply	other threads:[~2022-11-07 21:05 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-07 21:04 [PATCH v6 00/24] dmaengine: dw-edma: Add RP/EP local DMA controllers support Serge Semin
2022-11-07 21:04 ` [PATCH v6 01/24] dmaengine: Fix dma_slave_config.dst_addr description Serge Semin
2022-11-07 21:04 ` [PATCH v6 02/24] dmaengine: dw-edma: Release requested IRQs on failure Serge Semin
2022-11-07 21:04 ` [PATCH v6 03/24] dmaengine: dw-edma: Convert ll/dt phys-address to PCIe bus/DMA address Serge Semin
2022-11-07 21:04 ` [PATCH v6 04/24] dmaengine: dw-edma: Fix missing src/dst address of the interleaved xfers Serge Semin
2022-11-07 21:04 ` [PATCH v6 05/24] dmaengine: dw-edma: Don't permit non-inc " Serge Semin
2022-11-07 21:04 ` [PATCH v6 06/24] dmaengine: dw-edma: Fix invalid interleaved xfers semantics Serge Semin
2022-11-07 21:04 ` [PATCH v6 07/24] dmaengine: dw-edma: Add CPU to PCIe bus address translation Serge Semin
2022-11-07 21:04 ` [PATCH v6 08/24] dmaengine: dw-edma: Add PCIe bus address getter to the remote EP glue-driver Serge Semin
2022-11-07 21:04 ` [PATCH v6 09/24] dmaengine: dw-edma: Drop chancnt initialization Serge Semin
2022-11-07 21:04 ` [PATCH v6 10/24] dmaengine: dw-edma: Fix DebugFS reg entry type Serge Semin
2022-11-07 21:04 ` [PATCH v6 11/24] dmaengine: dw-edma: Stop checking debugfs_create_*() return value Serge Semin
2022-11-07 21:04 ` [PATCH v6 12/24] dmaengine: dw-edma: Add dw_edma prefix to the DebugFS nodes descriptor Serge Semin
2022-11-07 21:04 ` [PATCH v6 13/24] dmaengine: dw-edma: Convert DebugFS descs to being kz-allocated Serge Semin
2022-11-07 21:04 ` [PATCH v6 14/24] dmaengine: dw-edma: Rename DebugFS dentry variables to 'dent' Serge Semin
2022-11-07 21:04 ` [PATCH v6 15/24] dmaengine: dw-edma: Simplify the DebugFS context CSRs init procedure Serge Semin
2022-11-07 21:04 ` [PATCH v6 16/24] dmaengine: dw-edma: Move eDMA data pointer to DebugFS node descriptor Serge Semin
2022-11-07 21:04 ` [PATCH v6 17/24] dmaengine: dw-edma: Join Write/Read channels into a single device Serge Semin
2022-11-07 21:04 ` [PATCH v6 18/24] dmaengine: dw-edma: Use DMA-engine device DebugFS subdirectory Serge Semin
2022-11-07 21:04 ` [PATCH v6 19/24] dmaengine: dw-edma: Use non-atomic io-64 methods Serge Semin
2022-11-07 21:04 ` [PATCH v6 20/24] dmaengine: dw-edma: Drop DT-region allocation Serge Semin
2022-11-07 21:04 ` [PATCH v6 21/24] dmaengine: dw-edma: Replace chip ID number with device name Serge Semin
2022-11-07 21:04 ` [PATCH v6 22/24] dmaengine: dw-edma: Bypass dma-ranges mapping for the local setup Serge Semin
2022-11-07 21:11   ` Serge Semin
2022-11-25 15:32     ` Robin Murphy
2022-11-26 23:45       ` Serge Semin
2022-11-30  0:15         ` Serge Semin
2022-12-01 11:52         ` Robin Murphy
2022-12-11 17:33           ` Serge Semin
2022-11-07 21:04 ` Serge Semin [this message]
2022-11-07 21:04 ` [PATCH v6 24/24] PCI: dwc: Add DW eDMA engine support Serge Semin

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