From c2cbdbb1583830b77f169a717407f035d6627793 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 16 Oct 2007 14:42:30 +0200 Subject: [ALSA] fix bootup crash in snd_gus_interrupt() when simulating a storm of fake GUS interrupts (without actually owning this venerable piece of ISA hardware) the driver falls over (crashes) in two ways: 1) spinlocks being initialized too late: INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. [<401058ca>] show_trace_log_lvl+0x1a/0x30 [<401064b2>] show_trace+0x12/0x20 [<401064d6>] dump_stack+0x16/0x20 [<4014a72b>] __lock_acquire+0xcfb/0x1030 [<4014aac0>] lock_acquire+0x60/0x80 [<40721a68>] _spin_lock_irqsave+0x38/0x50 [<4058fc12>] snd_gf1_i_look8+0x22/0x60 [<405906fe>] snd_gus_interrupt+0x13e/0x270 [<401548e8>] handle_IRQ_event+0x28/0x60 [<40155cc1>] handle_fasteoi_irq+0x71/0xe0 [<40107238>] do_IRQ+0x48/0xa0 [<401051fe>] common_interrupt+0x2e/0x40 [<40156822>] register_handler_proc+0x92/0xf0 [<401550c2>] setup_irq+0xe2/0x190 [<40155224>] request_irq+0xb4/0xd0 [<4058f524>] snd_gus_create+0x124/0x3c0 [<40aa4087>] snd_gusclassic_probe+0x2a7/0x4b0 [<403f5eff>] isa_bus_probe+0x1f/0x30 [<403f1944>] driver_probe_device+0x84/0x190 [<403f1a58>] __device_attach+0x8/0x10 [<403f0e63>] bus_for_each_drv+0x53/0x80 [<403f1b1b>] device_attach+0x8b/0x90 [<403f0dd8>] bus_attach_device+0x48/0x80 [<403efdbd>] device_add+0x45d/0x5a0 [<403eff12>] device_register+0x12/0x20 [<403f60c3>] isa_register_driver+0xb3/0x140 [<40aa3dd2>] alsa_card_gusclassic_init+0x12/0x20 [<40a665c3>] kernel_init+0x133/0x310 [<401054a7>] kernel_thread_helper+0x7/0x10 ======================= 2) callback functions not being filled in yet: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 printing eip: 00000000 *pde = 00000000 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC CPU: 0 EIP: 0060:[<00000000>] Not tainted VLI EFLAGS: 00010002 (2.6.23 #37) EIP is at 0x0 eax: 7fe94000 ebx: 7fe94000 ecx: 00000000 edx: 00000226 esi: 00000000 edi: 00000005 ebp: 7ff87c28 esp: 7ff87bf4 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process swapper (pid: 1, ti=7ff86000 task=7ff84000 task.ti=7ff86000) Stack: 40590683 408424a9 408db87c 00000029 40787406 00000064 00000046 ff000000 000000ff 00000001 7faefaf0 00000000 00000005 7ff87c40 401548e8 00000000 40a52000 7faefaf0 00000005 7ff87c58 40155cc1 40a52030 00000005 00000000 Call Trace: [<401058ca>] show_trace_log_lvl+0x1a/0x30 [<4010598b>] show_stack_log_lvl+0xab/0xd0 [<40105b7c>] show_registers+0x1cc/0x2d0 [<40105d96>] die+0x116/0x240 [<4011d7bb>] do_page_fault+0x18b/0x670 [<40721d22>] error_code+0x72/0x80 [<401548e8>] handle_IRQ_event+0x28/0x60 [<40155cc1>] handle_fasteoi_irq+0x71/0xe0 [<40107238>] do_IRQ+0x48/0xa0 [<401051fe>] common_interrupt+0x2e/0x40 [<401a344e>] proc_create+0x3e/0x120 [<401a3733>] proc_mkdir_mode+0x23/0x50 [<401a376f>] proc_mkdir+0xf/0x20 [<40156864>] register_handler_proc+0xd4/0xf0 [<401550c2>] setup_irq+0xe2/0x190 [<40155224>] request_irq+0xb4/0xd0 [<4058f524>] snd_gus_create+0x124/0x3c0 [<40aa4087>] snd_gusclassic_probe+0x2a7/0x4b0 [<403f5eff>] isa_bus_probe+0x1f/0x30 [<403f1944>] driver_probe_device+0x84/0x190 [<403f1a58>] __device_attach+0x8/0x10 [<403f0e63>] bus_for_each_drv+0x53/0x80 [<403f1b1b>] device_attach+0x8b/0x90 [<403f0dd8>] bus_attach_device+0x48/0x80 [<403efdbd>] device_add+0x45d/0x5a0 [<403eff12>] device_register+0x12/0x20 [<403f60c3>] isa_register_driver+0xb3/0x140 [<40aa3dd2>] alsa_card_gusclassic_init+0x12/0x20 [<40a665c3>] kernel_init+0x133/0x310 [<401054a7>] kernel_thread_helper+0x7/0x10 ======================= Code: Bad EIP value. EIP: [<00000000>] 0x0 SS:ESP 0068:7ff87bf4 Kernel panic - not syncing: Fatal exception in interrupt with these things fixed, i get the expected 'no such hardware' result from the driver initialization: Calling initcall 0x40aa3dc0: alsa_card_gusclassic_init+0x0/0x20() ALSA sound/isa/gus/gusclassic.c:136: [0x220] check 1 failed - 0xff initcall 0x40aa3dc0: alsa_card_gusclassic_init+0x0/0x20() returned 0. initcall 0x40aa3dc0 ran for 133 msecs: alsa_card_gusclassic_init+0x0/0x20() Signed-off-by: Ingo Molnar Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/isa/gus/gus_irq.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) (limited to 'sound/isa/gus/gus_irq.c') diff --git a/sound/isa/gus/gus_irq.c b/sound/isa/gus/gus_irq.c index a0430b338d67..cd9a6f1c99e6 100644 --- a/sound/isa/gus/gus_irq.c +++ b/sound/isa/gus/gus_irq.c @@ -45,11 +45,13 @@ __again: // snd_printk("IRQ: status = 0x%x\n", status); if (status & 0x02) { STAT_ADD(gus->gf1.interrupt_stat_midi_in); - gus->gf1.interrupt_handler_midi_in(gus); + if (gus->gf1.interrupt_handler_midi_in) + gus->gf1.interrupt_handler_midi_in(gus); } if (status & 0x01) { STAT_ADD(gus->gf1.interrupt_stat_midi_out); - gus->gf1.interrupt_handler_midi_out(gus); + if (gus->gf1.interrupt_handler_midi_out) + gus->gf1.interrupt_handler_midi_out(gus); } if (status & (0x20 | 0x40)) { unsigned int already, _current_; @@ -85,20 +87,24 @@ __again: } if (status & 0x04) { STAT_ADD(gus->gf1.interrupt_stat_timer1); - gus->gf1.interrupt_handler_timer1(gus); + if (gus->gf1.interrupt_handler_timer1) + gus->gf1.interrupt_handler_timer1(gus); } if (status & 0x08) { STAT_ADD(gus->gf1.interrupt_stat_timer2); - gus->gf1.interrupt_handler_timer2(gus); + if (gus->gf1.interrupt_handler_timer2) + gus->gf1.interrupt_handler_timer2(gus); } if (status & 0x80) { if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL) & 0x40) { STAT_ADD(gus->gf1.interrupt_stat_dma_write); - gus->gf1.interrupt_handler_dma_write(gus); + if (gus->gf1.interrupt_handler_dma_write) + gus->gf1.interrupt_handler_dma_write(gus); } if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL) & 0x40) { STAT_ADD(gus->gf1.interrupt_stat_dma_read); - gus->gf1.interrupt_handler_dma_read(gus); + if (gus->gf1.interrupt_handler_dma_read) + gus->gf1.interrupt_handler_dma_read(gus); } } if (--loop > 0) -- cgit