Hi Marek, On Thu, Jan 30, 2020 at 11:33 AM Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote: > On 30.01.2020 09:30, Geert Uytterhoeven wrote: > > On Wed, Jan 29, 2020 at 6:47 PM Marek Szyprowski > > <m.szyprowski@xxxxxxxxxxx> wrote: > >> On 17.01.2020 16:30, Geert Uytterhoeven wrote: > >>> Currently it is not easy to find out which DMA channels are in use, and > >>> which slave devices are using which channels. > >>> > >>> Fix this by creating two symlinks between the DMA channel and the actual > >>> slave device when a channel is requested: > >>> 1. A "slave" symlink from DMA channel to slave device, > >>> 2. A "dma:<name>" symlink slave device to DMA channel. > >>> When the channel is released, the symlinks are removed again. > >>> The latter requires keeping track of the slave device and the channel > >>> name in the dma_chan structure. > >>> > >>> Note that this is limited to channel request functions for requesting an > >>> exclusive slave channel that take a device pointer (dma_request_chan() > >>> and dma_request_slave_channel*()). > >>> > >>> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> > >>> Tested-by: Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx> > >> This patch breaks booting on almost all Exynos based boards: > >> > >> https://lore.kernel.org/linux-samsung-soc/20200129161113.GE3928@xxxxxxxxxxxxx/T/#u > > Sorry for the breakage. > > No problem, that's why we have linux-next. Not really: by that time it had been upstream for 2 days :-( Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
