Arnd Bergmann <arnd@xxxxxxxx> writes: > I'm still unable to follow through that code, but I understand now that > the device you pass to dma_request_slave_channel() is not the one > we'd like it to be here. > > Where exactly does that call to dma_request_chan() happen? Is this > the one in dmaengine_pcm_new()? Could we perhaps put a > pointer to the SSP device into snd_dmaengine_dai_dma_data? This is a sample stack I captured with an added WARN_ON(1), triggered by a userland "aplay Sultans_Of_Swing.wav" :) [ 299.216743] [<c0012e80>] (unwind_backtrace) from [<c000f55c>] (show_stack+0x20/0x24) [ 299.223986] [<c000f55c>] (show_stack) from [<c0529d68>] (dump_stack+0x20/0x28) [ 299.231321] [<c0529d68>] (dump_stack) from [<c001de34>] (__warn+0xf0/0x11c) [ 299.238183] [<c001de34>] (__warn) from [<c001df94>] (warn_slowpath_null+0x4c/0x58) [ 299.245234] [<c001df94>] (warn_slowpath_null) from [<c02a2d38>] (dma_request_chan+0x40/0x228) [ 299.252550] [<c02a2d38>] (dma_request_chan) from [<c02a2f38>] (dma_request_slave_channel+0x18/0x24) [ 299.259855] [<c02a2f38>] (dma_request_slave_channel) from [<c03f76f0>] (__pxa2xx_pcm_open+0xf4/0x110) [ 299.266789] [<c03f76f0>] (__pxa2xx_pcm_open) from [<c0409ed0>] (soc_pcm_open+0xf8/0x9c8) [ 299.273932] [<c0409ed0>] (soc_pcm_open) from [<c03db9d4>] (snd_pcm_open_substream+0x9c/0x134) [ 299.281290] [<c03db9d4>] (snd_pcm_open_substream) from [<c03dbb28>] (snd_pcm_open+0xbc/0x22c) [ 299.288255] [<c03dbb28>] (snd_pcm_open) from [<c03dbd58>] (snd_pcm_playback_open+0x50/0x88) [ 299.295468] [<c03dbd58>] (snd_pcm_playback_open) from [<c03c9708>] (snd_open+0x124/0x144) [ 299.302897] [<c03c9708>] (snd_open) from [<c0117de4>] (chrdev_open+0x1a0/0x1f0) [ 299.310296] [<c0117de4>] (chrdev_open) from [<c010f4cc>] (do_dentry_open.constprop.0+0x1d4/0x31c) [ 299.317345] [<c010f4cc>] (do_dentry_open.constprop.0) from [<c011061c>] (vfs_open+0x7c/0x80) [ 299.324597] [<c011061c>] (vfs_open) from [<c0123080>] (path_openat+0xbe8/0xf90) [ 299.332003] [<c0123080>] (path_openat) from [<c0124240>] (do_filp_open+0x80/0xe4) [ 299.339044] [<c0124240>] (do_filp_open) from [<c0110a08>] (do_sys_open+0x148/0x1f8) [ 299.346225] [<c0110a08>] (do_sys_open) from [<c0110ae4>] (SyS_open+0x2c/0x30) [ 299.353505] [<c0110ae4>] (SyS_open) from [<c0009000>] (ret_fast_syscall+0x0/0x28) Cheers. -- Robert _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
