From: Dmitry Osipenko <digetx@gmail.com>
To: "Laxman Dewangan" <ldewangan@nvidia.com>,
"Vinod Koul" <vkoul@kernel.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v8 04/19] dmaengine: tegra-apb: Prevent race conditions on channel's freeing
Date: Sun, 9 Feb 2020 19:33:41 +0300 [thread overview]
Message-ID: <20200209163356.6439-5-digetx@gmail.com> (raw)
In-Reply-To: <20200209163356.6439-1-digetx@gmail.com>
It's incorrect to check the channel's "busy" state without taking a lock.
That shouldn't cause any real troubles, nevertheless it's always better
not to have any race conditions in the code.
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/dma/tegra20-apb-dma.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index f56881500a23..766c2c9eac8e 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -1294,8 +1294,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
- if (tdc->busy)
- tegra_dma_terminate_all(dc);
+ tegra_dma_terminate_all(dc);
spin_lock_irqsave(&tdc->lock, flags);
list_splice_init(&tdc->pending_sg_req, &sg_req_list);
--
2.24.0
next prev parent reply other threads:[~2020-02-09 16:41 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-09 16:33 [PATCH v8 00/19] NVIDIA Tegra APB DMA driver fixes and improvements Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 01/19] dmaengine: tegra-apb: Fix use-after-free Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 02/19] dmaengine: tegra-apb: Prevent race conditions of tasklet vs free list Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 03/19] dmaengine: tegra-apb: Implement synchronization hook Dmitry Osipenko
2020-02-09 16:33 ` Dmitry Osipenko [this message]
2020-02-09 16:33 ` [PATCH v8 05/19] dmaengine: tegra-apb: Clean up tasklet releasing Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 06/19] dmaengine: tegra-apb: Use devm_platform_ioremap_resource Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 07/19] dmaengine: tegra-apb: Use devm_request_irq Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 08/19] dmaengine: tegra-apb: Fix coding style problems Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 09/19] dmaengine: tegra-apb: Remove unneeded initialization of tdc->config_init Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 10/19] dmaengine: tegra-apb: Remove assumptions about unavailable runtime PM Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 11/19] dmaengine: tegra-apb: Remove duplicated pending_sg_req checks Dmitry Osipenko
2020-02-14 14:13 ` Jon Hunter
2020-02-09 16:33 ` [PATCH v8 12/19] dmaengine: tegra-apb: Keep clock enabled only during of DMA transfer Dmitry Osipenko
2020-02-14 14:15 ` Jon Hunter
2020-02-09 16:33 ` [PATCH v8 13/19] dmaengine: tegra-apb: Clean up suspend-resume Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 14/19] dmaengine: tegra-apb: Add missing of_dma_controller_free Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 15/19] dmaengine: tegra-apb: Allow to compile as a loadable kernel module Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 16/19] dmaengine: tegra-apb: Remove MODULE_ALIAS Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 17/19] dmaengine: tegra-apb: Support COMPILE_TEST Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 18/19] dmaengine: tegra-apb: Remove unused function argument Dmitry Osipenko
2020-02-14 14:16 ` Jon Hunter
2020-02-14 16:54 ` Dmitry Osipenko
2020-02-17 11:15 ` Jon Hunter
2020-02-17 14:56 ` Dmitry Osipenko
2020-02-09 16:33 ` [PATCH v8 19/19] dmaengine: tegra-apb: Improve error message about DMA underflow Dmitry Osipenko
2020-02-14 14:16 ` Jon Hunter
2020-02-25 6:32 ` [PATCH v8 00/19] NVIDIA Tegra APB DMA driver fixes and improvements Vinod Koul
2020-02-25 7:05 ` Dmitry Osipenko
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