On Wed, Oct 09, 2013 at 02:39:52PM +0800, Peter Chen wrote: > After configuration, the host also possible sends bus reset > at any time, at such situation, it will trigger below spinlock > recursion dump. This commit unlocks the spinlock before calling > gadget's disconnect. > > BUG: spinlock recursion on CPU#0, swapper/0/0 > lock: 0xbf128014, .magic: dead4ead, .owner: swapper/0/0, .owner_cpu: 0 > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.11.0-next-20130910+ #106 > [<80014e20>] (unwind_backtrace+0x0/0xec) from [<80011a6c>] (show_stack+0x10/0x14) > [<80011a6c>] (show_stack+0x10/0x14) from [<805c143c>] (dump_stack+0x94/0xbc) > [<805c143c>] (dump_stack+0x94/0xbc) from [<80282cf8>] (do_raw_spin_lock+0x16c/0x18c) > [<80282cf8>] (do_raw_spin_lock+0x16c/0x18c) from [<805c77e0>] (_raw_spin_lock_irqsave+0x50/0x5c) > [<805c77e0>] (_raw_spin_lock_irqsave+0x50/0x5c) from [<803cff88>] (ep_disable+0x24/0x110) > [<803cff88>] (ep_disable+0x24/0x110) from [<7f015d50>] (gserial_disconnect+0xa0/0x15c [u_serial]) > [<7f015d50>] (gserial_disconnect+0xa0/0x15c [u_serial]) from [<7f01c06c>] (acm_disable+0xc/0x30 [usb_f_acm]) > [<7f01c06c>] (acm_disable+0xc/0x30 [usb_f_acm]) from [<7f001478>] (reset_config.isra.10+0x34/0x5c [libcomposite]) > [<7f001478>] (reset_config.isra.10+0x34/0x5c [libcomposite]) from [<7f0014d4>] (composite_disconnect+0x34/0x5c [libcomposite]) > [<7f0014d4>] (composite_disconnect+0x34/0x5c [libcomposite]) from [<803d1024>] (udc_irq+0x770/0xce4) > [<803d1024>] (udc_irq+0x770/0xce4) from [<803cdcc0>] (ci_irq+0x98/0x164) > [<803cdcc0>] (ci_irq+0x98/0x164) from [<8007edfc>] (handle_irq_event_percpu+0x50/0x17c) > [<8007edfc>] (handle_irq_event_percpu+0x50/0x17c) from [<8007ef64>] (handle_irq_event+0x3c/0x5c) > [<8007ef64>] (handle_irq_event+0x3c/0x5c) from [<80081e98>] (handle_fasteoi_irq+0x98/0x168) > [<80081e98>] (handle_fasteoi_irq+0x98/0x168) from [<8007e598>] (generic_handle_irq+0x28/0x3c) > [<8007e598>] (generic_handle_irq+0x28/0x3c) from [<8000edf4>] (handle_IRQ+0x4c/0xb4) > [<8000edf4>] (handle_IRQ+0x4c/0xb4) from [<800085bc>] (gic_handle_irq+0x28/0x5c) > [<800085bc>] (gic_handle_irq+0x28/0x5c) from [<800125c0>] (__irq_svc+0x40/0x54) > Exception stack(0x8083bf68 to 0x8083bfb0) > bf60: 81533b80 00000000 00096234 8001d760 8088e12c 00000000 > bf80: 8083a000 8083a000 8084290c 805cb414 808428ac 8083a000 00000001 8083bfb0 > bfa0: 8000f138 8000f13c 60000013 ffffffff > [<800125c0>] (__irq_svc+0x40/0x54) from [<8000f13c>] (arch_cpu_idle+0x30/0x3c) > [<8000f13c>] (arch_cpu_idle+0x30/0x3c) from [<8005eb94>] (cpu_startup_entry+0xf4/0x148) > [<8005eb94>] (cpu_startup_entry+0xf4/0x148) from [<807f1a2c>] (start_kernel+0x2c4/0x318) > BUG: spinlock lockup suspected on CPU#0, swapper/0/0 > lock: 0xbf128014, .magic: dead4ead, .owner: swapper/0/0, .owner_cpu: 0 > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.11.0-next-20130910+ #106 > [<80014e20>] (unwind_backtrace+0x0/0xec) from [<80011a6c>] (show_stack+0x10/0x14) > [<80011a6c>] (show_stack+0x10/0x14) from [<805c143c>] (dump_stack+0x94/0xbc) > [<805c143c>] (dump_stack+0x94/0xbc) from [<80282c94>] (do_raw_spin_lock+0x108/0x18c) > [<80282c94>] (do_raw_spin_lock+0x108/0x18c) from [<805c77e0>] (_raw_spin_lock_irqsave+0x50/0x5c) > [<805c77e0>] (_raw_spin_lock_irqsave+0x50/0x5c) from [<803cff88>] (ep_disable+0x24/0x110) > [<803cff88>] (ep_disable+0x24/0x110) from [<7f015d50>] (gserial_disconnect+0xa0/0x15c [u_serial]) > [<7f015d50>] (gserial_disconnect+0xa0/0x15c [u_serial]) from [<7f01c06c>] (acm_disable+0xc/0x30 [usb_f_acm]) > [<7f01c06c>] (acm_disable+0xc/0x30 [usb_f_acm]) from [<7f001478>] (reset_config.isra.10+0x34/0x5c [libcomposite]) > [<7f001478>] (reset_config.isra.10+0x34/0x5c [libcomposite]) from [<7f0014d4>] (composite_disconnect+0x34/0x5c [libcomposite]) > [<7f0014d4>] (composite_disconnect+0x34/0x5c [libcomposite]) from [<803d1024>] (udc_irq+0x770/0xce4) > [<803d1024>] (udc_irq+0x770/0xce4) from [<803cdcc0>] (ci_irq+0x98/0x164) > [<803cdcc0>] (ci_irq+0x98/0x164) from [<8007edfc>] (handle_irq_event_percpu+0x50/0x17c) > [<8007edfc>] (handle_irq_event_percpu+0x50/0x17c) from [<8007ef64>] (handle_irq_event+0x3c/0x5c) > [<8007ef64>] (handle_irq_event+0x3c/0x5c) from [<80081e98>] (handle_fasteoi_irq+0x98/0x168) > [<80081e98>] (handle_fasteoi_irq+0x98/0x168) from [<8007e598>] (generic_handle_irq+0x28/0x3c) > [<8007e598>] (generic_handle_irq+0x28/0x3c) from [<8000edf4>] (handle_IRQ+0x4c/0xb4) > [<8000edf4>] (handle_IRQ+0x4c/0xb4) from [<800085bc>] (gic_handle_irq+0x28/0x5c) > [<800085bc>] (gic_handle_irq+0x28/0x5c) from [<800125c0>] (__irq_svc+0x40/0x54) > Exception stack(0x8083bf68 to 0x8083bfb0) > bf60: 81533b80 00000000 00096234 8001d760 8088e12c 00000000 > bf80: 8083a000 8083a000 8084290c 805cb414 808428ac 8083a000 00000001 8083bfb0 > bfa0: 8000f138 8000f13c 60000013 ffffffff > [<800125c0>] (__irq_svc+0x40/0x54) from [<8000f13c>] (arch_cpu_idle+0x30/0x3c) > [<8000f13c>] (arch_cpu_idle+0x30/0x3c) from [<8005eb94>] (cpu_startup_entry+0xf4/0x148) > [<8005eb94>] (cpu_startup_entry+0xf4/0x148) from [<807f1a2c>] (start_kernel+0x2c4/0x318) > > Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx> Doesn't apply to 3.12-rc4, so I'll queue it up for 3.13. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
