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From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
	Vinod Koul <vkoul@kernel.org>, Jingoo Han <jingoohan1@gmail.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.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>,
	"Rob Herring" <robh@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	linux-pci@vger.kernel.org, dmaengine@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	"Gustavo Pimentel" <Gustavo.Pimentel@synopsys.com>
Subject: [PATCH v2 03/26] dmaengine: dw-edma: Release requested IRQs on failure
Date: Wed, 4 May 2022 01:50:41 +0300	[thread overview]
Message-ID: <20220503225104.12108-4-Sergey.Semin@baikalelectronics.ru> (raw)
In-Reply-To: <20220503225104.12108-1-Sergey.Semin@baikalelectronics.ru>

From very beginning of the DW eDMA driver live in the kernel the method
dw_edma_irq_request() hasn't been designed quite correct. In case if the
request_irq() method fails to initialize the IRQ handler at some point the
previously requested IRQs will be left initialized. It's prune to errors
up to the system crash. Let's fix that by releasing the previously
requested IRQs in the cleanup-on-error path of the dw_edma_irq_request()
function.

Fixes: e63d79d1ffcd ("dmaengine: Add Synopsys eDMA IP core driver")
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

---

Changelog v2:
- This is a new patch added in v2 iteration of the series.
---
 drivers/dma/dw-edma/dw-edma-core.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 07f756479663..04efcb16d13d 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -899,10 +899,8 @@ static int dw_edma_irq_request(struct dw_edma *dw,
 						dw_edma_interrupt_read,
 					  IRQF_SHARED, dw->name,
 					  &dw->irq[i]);
-			if (err) {
-				dw->nr_irqs = i;
-				return err;
-			}
+			if (err)
+				goto err_irq_free;
 
 			if (irq_get_msi_desc(irq))
 				get_cached_msi_msg(irq, &dw->irq[i].msi);
@@ -911,6 +909,14 @@ static int dw_edma_irq_request(struct dw_edma *dw,
 		dw->nr_irqs = i;
 	}
 
+	return 0;
+
+err_irq_free:
+	for  (i--; i >= 0; i--) {
+		irq = chip->ops->irq_vector(dev, i);
+		free_irq(irq, &dw->irq[i]);
+	}
+
 	return err;
 }
 
-- 
2.35.1


  parent reply	other threads:[~2022-05-03 22:51 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-03 22:50 [PATCH v2 00/26] dmaengine: dw-edma: Add RP/EP local DMA controllers support Serge Semin
2022-05-03 22:50 ` [PATCH v2 01/26] dma-direct: take dma-ranges/offsets into account in resource mapping Serge Semin
2022-05-09  6:15   ` Christoph Hellwig
2022-05-12 23:28     ` Serge Semin
2022-05-03 22:50 ` [PATCH v2 02/26] dmaengine: Fix dma_slave_config.dst_addr description Serge Semin
2022-05-12 14:18   ` Manivannan Sadhasivam
2022-05-03 22:50 ` Serge Semin [this message]
2022-05-12 14:39   ` [PATCH v2 03/26] dmaengine: dw-edma: Release requested IRQs on failure Manivannan Sadhasivam
2022-05-03 22:50 ` [PATCH v2 04/26] dmaengine: dw-edma: Convert ll/dt phys-address to PCIe bus/DMA address Serge Semin
2022-05-03 22:50 ` [PATCH v2 05/26] dmaengine: dw-edma: Fix missing src/dst address of the interleaved xfers Serge Semin
2022-05-03 22:50 ` [PATCH v2 06/26] dmaengine: dw-edma: Don't permit non-inc " Serge Semin
2022-05-12 14:41   ` Manivannan Sadhasivam
2022-05-03 22:50 ` [PATCH v2 07/26] dmaengine: dw-edma: Fix invalid interleaved xfers semantics Serge Semin
2022-05-12 15:16   ` Manivannan Sadhasivam
2022-05-03 22:50 ` [PATCH v2 08/26] dmaengine: dw-edma: Add CPU to PCIe bus address translation Serge Semin
2022-05-03 22:50 ` [PATCH v2 09/26] dmaengine: dw-edma: Add PCIe bus address getter to the remote EP glue-driver Serge Semin
2022-05-03 22:50 ` [PATCH v2 10/26] dmaengine: dw-edma: Drop chancnt initialization Serge Semin
2022-05-03 22:50 ` [PATCH v2 11/26] dmaengine: dw-edma: Fix DebugFS reg entry type Serge Semin
2022-05-03 22:50 ` [PATCH v2 12/26] dmaengine: dw-edma: Stop checking debugfs_create_*() return value Serge Semin
2022-05-03 22:50 ` [PATCH v2 13/26] dmaengine: dw-edma: Add dw_edma prefix to the DebugFS nodes descriptor Serge Semin
2022-05-03 22:50 ` [PATCH v2 14/26] dmaengine: dw-edma: Convert DebugFS descs to being kz-allocated Serge Semin
2022-05-12 15:17   ` Manivannan Sadhasivam
2022-05-03 22:50 ` [PATCH v2 15/26] dmaengine: dw-edma: Rename DebugFS dentry variables to 'dent' Serge Semin
2022-05-12 15:19   ` Manivannan Sadhasivam
2022-05-03 22:50 ` [PATCH v2 16/26] dmaengine: dw-edma: Simplify the DebugFS context CSRs init procedure Serge Semin
2022-05-12 15:20   ` Manivannan Sadhasivam
2022-05-03 22:50 ` [PATCH v2 17/26] dmaengine: dw-edma: Move eDMA data pointer to DebugFS node descriptor Serge Semin
2022-05-03 22:50 ` [PATCH v2 18/26] dmaengine: dw-edma: Join Write/Read channels into a single device Serge Semin
2022-05-03 22:50 ` [PATCH v2 19/26] dmaengine: dw-edma: Use DMA-engine device DebugFS subdirectory Serge Semin
2022-05-03 22:50 ` [PATCH v2 20/26] dmaengine: dw-edma: Use non-atomic io-64 methods Serge Semin
2022-05-12 15:21   ` Manivannan Sadhasivam
2022-05-03 22:50 ` [PATCH v2 21/26] dmaengine: dw-edma: Drop DT-region allocation Serge Semin
2022-05-03 22:51 ` [PATCH v2 22/26] dmaengine: dw-edma: Replace chip ID number with device name Serge Semin
2022-05-03 22:51 ` [PATCH v2 23/26] dmaengine: dw-edma: Bypass dma-ranges mapping for the local setup Serge Semin
2022-05-24 13:19   ` Manivannan Sadhasivam
2022-05-25  8:56     ` Serge Semin
2022-05-03 22:51 ` [PATCH v2 24/26] dmaengine: dw-edma: Skip cleanup procedure if no private data found Serge Semin
2022-05-12 15:23   ` Manivannan Sadhasivam
2022-05-12 17:38     ` Serge Semin
2022-05-03 22:51 ` [PATCH v2 25/26] PCI: dwc: Add generic iATU/eDMA CSRs space detection method Serge Semin
2022-05-03 22:51 ` [PATCH v2 26/26] PCI: dwc: Add DW eDMA engine support Serge Semin
2022-05-12 14:11 ` [PATCH v2 00/26] dmaengine: dw-edma: Add RP/EP local DMA controllers support Manivannan Sadhasivam

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