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Date: Wed, 14 Oct 2015 16:28:23 +0100 From: Daniel Thompson <daniel.thompson@...aro.org> To: M'boumba Cedric Madianga <cedric.madianga@...il.com> Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>, robh+dt@...nel.org, pawel.moll@....com, Mark Rutland <mark.rutland@....com>, ijc+devicetree@...lion.org.uk, Kumar Gala <galak@...eaurora.org>, linux@....linux.org.uk, Vinod Koul <vinod.koul@...el.com>, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org Subject: Re: [PATCH v2 2/4] dmaengine: Add STM32 DMA driver On 14/10/15 16:26, M'boumba Cedric Madianga wrote: > 2015-10-14 16:24 GMT+02:00 Daniel Thompson <daniel.thompson@...aro.org>: >> >> Hmnnn... >> >> The dmaengine framework will WARN_ONCE() if an dmaengine is removed whilst >> it is active and also works hard to ensure dmaengine modules are not removed >> whilst there are active drivers using the framework. >> >> How do we get into this function whilst there is still an active DMA >> channels? > > For example, when a user try "rmmod stm32-dma" in uart console. > It will enter in stm32_dma_remove while there is potentially still active DMA. Check dmaengine.c for yourself but I think in this case the dmaengine framework will hold references to the module and prevent the remove from taking place. Daniel. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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