From 2af2b70c107b8a2e75e3c3351f3777e8cf26229c Mon Sep 17 00:00:00 2001 From: Yu Zhao Date: Tue, 11 Sep 2018 15:14:04 -0600 Subject: sound: enable interrupt after dma buffer initialization [ Upstream commit b61749a89f826eb61fc59794d9e4697bd246eb61 ] 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. Reviewed-by: Takashi Iwai Signed-off-by: Yu Zhao Signed-off-by: Mark Brown Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- sound/hda/hdac_controller.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'sound/hda') diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c index f6d2985b2520..6da6f3b8a623 100644 --- a/sound/hda/hdac_controller.c +++ b/sound/hda/hdac_controller.c @@ -40,6 +40,8 @@ static void azx_clear_corbrp(struct hdac_bus *bus) */ void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus) { + WARN_ON_ONCE(!bus->rb.area); + spin_lock_irq(&bus->reg_lock); /* CORB set up */ bus->corb.addr = bus->rb.addr; @@ -478,13 +480,15 @@ bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset) /* reset controller */ azx_reset(bus, full_reset); - /* initialize interrupts */ + /* clear interrupts */ azx_int_clear(bus); - azx_int_enable(bus); /* initialize the codec command I/O */ snd_hdac_bus_init_cmd_io(bus); + /* enable interrupts after CORB/RIRB buffers are initialized above */ + azx_int_enable(bus); + /* program the position buffer */ if (bus->use_posbuf && bus->posbuf.addr) { snd_hdac_chip_writel(bus, DPLBASE, (u32)bus->posbuf.addr); -- cgit v1.2.3