[PATCH v7 1/3] MTD : add the common code for GPMI-NFC controller driver

Wolfram Sang w.sang at pengutronix.de
Wed Jun 29 08:29:42 EDT 2011

> > Still, the problem exists: When a second channel GPMI channel is
> > requested, dmaengine will return -EBUSY, because the DMAIRQ is already
> > taken.
> >
> Yes, we should change the DMA code, it is a DMA bug.
> I ever submitted a patch about the issue:
> http://patchwork.ozlabs.org/patch/87145/

That approach was rejected because it would register the same handler
n-times where one time would do. Your other approach puts too much
mach-specific details into the driver IMO and probably won't scale very
well. Maybe we should add something to the private dma_data (like flags
indicating SHARED) and then do some refcounting?



Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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