Hi, we've got a bug report about the suspend/resume regression of DVB device with 3.19. The symptom is VLC doesn't work after S3 or S4 resume. strace shows that /dev/dvb/adaptor0/dvr returns -ENODEV.
The reporter confirmed that 3.18 works fine, so the regression must be in 3.19. There is a relevant kernel warning while suspending: WARNING: CPU: 1 PID: 3603 at ../kernel/module.c:1001 module_put+0xc7/0xd0() Workqueue: events_unbound async_run_entry_fn 0000000000000000 ffffffff81a45779 ffffffff81664f12 0000000000000000 ffffffff81062381 0000000000000000 ffffffffa051eea0 ffff8800ca369278 ffffffffa051a068 ffff8800c0a18090 ffffffff810dfb47 0000000000000000 Call Trace: [<ffffffff810055ac>] dump_trace+0x8c/0x340 [<ffffffff81005903>] show_stack_log_lvl+0xa3/0x190 [<ffffffff81007061>] show_stack+0x21/0x50 [<ffffffff81664f12>] dump_stack+0x47/0x67 [<ffffffff81062381>] warn_slowpath_common+0x81/0xb0 [<ffffffff810dfb47>] module_put+0xc7/0xd0 [<ffffffffa04d98d1>] dvb_usb_adapter_frontend_exit+0x41/0x60 [dvb_usb] [<ffffffffa04d8451>] dvb_usb_exit+0x31/0xa0 [dvb_usb] [<ffffffffa04d84fb>] dvb_usb_device_exit+0x3b/0x50 [dvb_usb] [<ffffffff814cefad>] usb_unbind_interface+0x1ed/0x2c0 [<ffffffff8145ceae>] __device_release_driver+0x7e/0x100 [<ffffffff8145cf52>] device_release_driver+0x22/0x30 [<ffffffff814cf13d>] usb_forced_unbind_intf+0x2d/0x60 [<ffffffff814cf3c3>] usb_suspend+0x73/0x130 [<ffffffff814bd453>] usb_dev_freeze+0x13/0x20 [<ffffffff81468fca>] dpm_run_callback+0x4a/0x150 [<ffffffff81469c81>] __device_suspend+0x121/0x350 [<ffffffff81469ece>] async_suspend+0x1e/0xa0 [<ffffffff81081e63>] async_run_entry_fn+0x43/0x150 [<ffffffff81079e72>] process_one_work+0x142/0x3f0 [<ffffffff8107a234>] worker_thread+0x114/0x460 [<ffffffff8107f3b1>] kthread+0xc1/0xe0 [<ffffffff8166b77c>] ret_from_fork+0x7c/0xb0 So something went wrong in module refcount, which likely leads to disabling the device and returning -ENODEV in the end. Does this ring a bell to you guys? The hardware details and logs are found in the URL below: https://bugzilla.novell.com/show_bug.cgi?id=916577 thanks, Takashi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
