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Re: [PATCH 07/13] dmaengine: introduce dma_request_channel and private channels

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From: Dan Williams
Subject: Re: [PATCH 07/13] dmaengine: introduce dma_request_channel and private channels
Date: Thursday, December 18, 2008 - 10:27 am

On Thu, Dec 18, 2008 at 7:33 AM, Sosnowski, Maciej
<maciej.sosnowski@intel.com> wrote:

If a greedy module comes along and grabs all the channels via
dma_request_channel() then yes, there will be nothing left for the
public pool.  So, there is a requirement to "play nice".  If this
becomes an issue in practice we could add a DMA_NO_PRIVATE flag to
reserve a channel for public-only usage.

Regards,
Dan
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Messages in current thread:
[PATCH 00/13] dmaengine redux, Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 01/13] async_tx, dmaengine: document channel alloca ..., Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 02/13] dmaengine: remove dependency on async_tx, Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 03/13] dmaengine: up-level reference counting to th ..., Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 04/13] dmaengine: centralize channel allocation, in ..., Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 05/13] dmaengine: provide a common 'issue_pending_a ..., Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 06/13] net_dma: convert to dma_find_channel, Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 07/13] dmaengine: introduce dma_request_channel and ..., Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 08/13] dmatest: convert to dma_request_channel, Dan Williams, (Fri Nov 14, 2:34 pm)
[PATCH 09/13] atmel-mci: convert to dma_request_channel an ..., Dan Williams, (Fri Nov 14, 2:35 pm)
[PATCH 10/13] dmaengine: replace dma_async_client_register ..., Dan Williams, (Fri Nov 14, 2:35 pm)
[PATCH 11/13] dmaengine: kill struct dma_client and suppor ..., Dan Williams, (Fri Nov 14, 2:35 pm)
[PATCH 12/13] dmaengine: remove 'bigref' infrastructure, Dan Williams, (Fri Nov 14, 2:35 pm)
[PATCH 13/13] dmaengine: kill enum dma_state_client, Dan Williams, (Fri Nov 14, 2:35 pm)
Re: [PATCH 02/13] dmaengine: remove dependency on async_tx, Andrew Morton, (Fri Nov 14, 11:02 pm)
Re: [PATCH 03/13] dmaengine: up-level reference counting t ..., Andrew Morton, (Fri Nov 14, 11:08 pm)
Re: [PATCH 04/13] dmaengine: centralize channel allocation ..., Andrew Morton, (Fri Nov 14, 11:14 pm)
Re: [PATCH 08/13] dmatest: convert to dma_request_channel, Andrew Morton, (Fri Nov 14, 11:17 pm)
Re: [PATCH 02/13] dmaengine: remove dependency on async_tx, Dan Williams, (Mon Nov 17, 4:44 pm)
Re: [PATCH 03/13] dmaengine: up-level reference counting t ..., Dan Williams, (Mon Nov 17, 8:42 pm)
Re: [PATCH 04/13] dmaengine: centralize channel allocation ..., Dan Williams, (Mon Nov 17, 10:59 pm)
Re: [PATCH 08/13] dmatest: convert to dma_request_channel, Dan Williams, (Tue Nov 18, 11:24 am)
Re: [PATCH 08/13] dmatest: convert to dma_request_channel, Andrew Morton, (Tue Nov 18, 1:58 pm)
Re: [PATCH 08/13] dmatest: convert to dma_request_channel, Dan Williams, (Tue Nov 18, 3:19 pm)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Guennadi Liakhovetski, (Tue Dec 2, 8:52 am)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Dan Williams, (Tue Dec 2, 10:16 am)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Nicolas Ferre, (Tue Dec 2, 10:26 am)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Guennadi Liakhovetski, (Tue Dec 2, 10:27 am)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Dan Williams, (Tue Dec 2, 12:10 pm)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Guennadi Liakhovetski, (Tue Dec 2, 2:28 pm)
Re: [PATCH 03/13] dmaengine: up-level reference counting t ..., Guennadi Liakhovetski, (Thu Dec 4, 9:56 am)
Re: [PATCH 03/13] dmaengine: up-level reference counting t ..., Dan Williams, (Thu Dec 4, 11:51 am)
Re: [PATCH 03/13] dmaengine: up-level reference counting t ..., Guennadi Liakhovetski, (Thu Dec 4, 12:28 pm)
Re: [PATCH 03/13] dmaengine: up-level reference counting t ..., Dan Williams, (Mon Dec 8, 3:39 pm)
RE: [PATCH 00/13] dmaengine redux, Sosnowski, Maciej, (Fri Dec 12, 7:27 am)
RE: [PATCH 03/13] dmaengine: up-level reference counting t ..., Sosnowski, Maciej, (Fri Dec 12, 7:28 am)
RE: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Sosnowski, Maciej, (Fri Dec 12, 7:29 am)
RE: [PATCH 11/13] dmaengine: kill struct dma_client and su ..., Sosnowski, Maciej, (Fri Dec 12, 7:29 am)
Re: [PATCH 03/13] dmaengine: up-level reference counting t ..., Dan Williams, (Mon Dec 15, 3:12 pm)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Dan Williams, (Mon Dec 15, 4:55 pm)
Re: [PATCH 11/13] dmaengine: kill struct dma_client and su ..., Dan Williams, (Mon Dec 15, 5:09 pm)
RE: [PATCH 03/13] dmaengine: up-level reference counting t ..., Sosnowski, Maciej, (Thu Dec 18, 7:26 am)
RE: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Sosnowski, Maciej, (Thu Dec 18, 7:33 am)
RE: [PATCH 11/13] dmaengine: kill struct dma_client and su ..., Sosnowski, Maciej, (Thu Dec 18, 7:34 am)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Dan Williams, (Thu Dec 18, 10:27 am)
Re: [PATCH 09/13] atmel-mci: convert to dma_request_channe ..., Atsushi Nemoto, (Fri Jan 30, 9:40 am)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Atsushi Nemoto, (Fri Jan 30, 10:03 am)
Re: [PATCH 09/13] atmel-mci: convert to dma_request_channe ..., Dan Williams, (Fri Jan 30, 4:02 pm)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Dan Williams, (Fri Jan 30, 4:13 pm)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Guennadi Liakhovetski, (Fri Jan 30, 4:27 pm)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Atsushi Nemoto, (Sat Jan 31, 5:18 am)
Re: [PATCH 07/13] dmaengine: introduce dma_request_channel ..., Atsushi Nemoto, (Fri Feb 6, 9:58 am)