This reverts commit 12eeeb4f4733bbc4481d01df35933fc15beb8b19.
The patch claims it fixes accessing memory with null pointer on skl_interrupt() and snd_hdac_bus_update_rirb() path, but in fact it has no effect.
There are two problems: 1) skl_init_chip() is called twice, before and after dma buffer is allocate. The first call sets bus->chip_init which prevents the second from initializing bus->corb.buf and rirb.buf from bus->rb.area. 2) snd_hdac_bus_init_chip() enables interrupt before snd_hdac_bus_init_cmd_io() initializing dma buffers. There is a small window which skl_interrupt() can be called if irq has been acquired. If so, it crashes when using null dma buffer pointers.
Will fix the problems in the following patches. Also attaching the crash for future reference.
[ 16.949148] general protection fault: 0000 [#1] PREEMPT SMP KASAN PTI <snipped> [ 16.950903] Call Trace: [ 16.950906] <IRQ> [ 16.950918] skl_interrupt+0x19e/0x2d6 [snd_soc_skl] [ 16.950926] ? dma_supported+0xb5/0xb5 [snd_soc_skl] [ 16.950933] __handle_irq_event_percpu+0x27a/0x6c8 [ 16.950937] ? __irq_wake_thread+0x1d1/0x1d1 [ 16.950942] ? __do_softirq+0x57a/0x69e [ 16.950944] handle_irq_event_percpu+0x95/0x1ba [ 16.950948] ? _raw_spin_unlock+0x65/0xdc [ 16.950951] ? __handle_irq_event_percpu+0x6c8/0x6c8 [ 16.950953] ? _raw_spin_unlock+0x65/0xdc [ 16.950957] ? time_cpufreq_notifier+0x483/0x483 [ 16.950959] handle_irq_event+0x89/0x123 [ 16.950962] handle_fasteoi_irq+0x16f/0x425 [ 16.950965] handle_irq+0x1fe/0x28e [ 16.950969] do_IRQ+0x6e/0x12e [ 16.950972] common_interrupt+0x7a/0x7a [ 16.950974] </IRQ> <snipped> [ 16.951031] RIP: snd_hdac_bus_update_rirb+0x19b/0x4cf [snd_hda_core] RSP: ffff88015c807c08 [ 16.951036] ---[ end trace 58bf9ece1775bc92 ]---
Fixes: 2eeeb4f4733b ("ASoC: Intel: Skylake: Acquire irq after RIRB allocation") Signed-off-by: Yu Zhao yuzhao@google.com --- sound/soc/intel/skylake/skl.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c index e7fd14daeb4f..d174cbe35f7a 100644 --- a/sound/soc/intel/skylake/skl.c +++ b/sound/soc/intel/skylake/skl.c @@ -912,7 +912,11 @@ static int skl_first_init(struct hdac_bus *bus)
snd_hdac_bus_parse_capabilities(bus);
+ if (skl_acquire_irq(bus, 0) < 0) + return -EBUSY; + pci_set_master(pci); + synchronize_irq(bus->irq);
gcap = snd_hdac_chip_readw(bus, GCAP); dev_dbg(bus->dev, "chipset global capabilities = 0x%x\n", gcap); @@ -945,12 +949,6 @@ static int skl_first_init(struct hdac_bus *bus) if (err < 0) return err;
- err = skl_acquire_irq(bus, 0); - if (err < 0) - return err; - - synchronize_irq(bus->irq); - /* initialize chip */ skl_init_pci(skl);