On 11-09-18, 14:58, Yu Zhao wrote:
On Tue, Sep 11, 2018 at 08:06:49AM +0200, Takashi Iwai wrote:
On Mon, 10 Sep 2018 23:21:50 +0200, Yu Zhao wrote:
In snd_hdac_bus_init_chip(), we enable interrupt before snd_hdac_bus_init_cmd_io() initializing dma buffers. If irq has been acquired and irq handler uses the dma buffer, kernel may crash when interrupt comes in.
Fix the problem by postponing enabling irq after dma buffer initialization. And warn once on null dma buffer pointer during the initialization.
Signed-off-by: Yu Zhao yuzhao@google.com
Looks good to me.
Reviewed-by: Takashi Iwai tiwai@suse.de
BTW, the reason why this hasn't been hit on the legacy HD-audio driver is that we allocate usually with MSI, so the irq is isolated.
Any reason that Intel SKL driver doesn't use MST?
This I'm not sure. Vinod might have answer to it, according to https://patchwork.kernel.org/patch/6375831/#13796611
IIRC (seemed quite some time back) we faced issues with using MSI on SKL and didnt try afterwards. If Intel folks can try it and check. Pierre is out, maybe Liam can help..?