On Wed, Jul 12, 2017 at 5:55 PM, Johan Hovold <johan@xxxxxxxxxx> wrote: > This reverts commit 99b04f4c4051 ("ASoC: add Component level > pcm_new/pcm_free"), which started calling the pcm_new callback for every > component in a *card* when creating a new pcm, something which does not > seem to make any sense. > > This specifically led to memory leaks in systems with more than one > platform component and where DMA memory is allocated in the > platform-driver callback. For example, when both mcasp devices are being > used on an am335x board, DMA memory would be allocated twice for every > DAI link during probe. > > When CONFIG_SND_VERBOSE_PROCFS was set this fortunately also led to > warnings such as: > > WARNING: CPU: 0 PID: 565 at ../fs/proc/generic.c:346 proc_register+0x110/0x154 > proc_dir_entry 'sub0/prealloc' already registered > > Since there seems to be no users of the new component callbacks, and the > current implementation introduced a regression, let's revert the > offending commit for now. > > Fixes: 99b04f4c4051 ("ASoC: add Component level pcm_new/pcm_free") > Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.10 > Cc: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx> > Cc: Brian Norris <briannorris@xxxxxxxxxxxx> > Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> I have repeatedly ran into this bug, thanks a *lot* for fixing it. It solves a problem not only on this old code but also in my development tree where I try to move the Ux500 audio to DT-only instantiation and this was a blocker that I just ran my head into the last month or two. Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Tested-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Yours, Linus Walleij