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Driver must free the console lock whether driver resuming successful or not. Otherwise, fb_console will be always waiting for the lock and then cause system stuck. [ 244.405541] INFO: task kworker/0:0:4 blocked for more than 120 seconds. [ 244.405543] Tainted: G OE 4.9.0-custom #1 [ 244.405544] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 244.405541] INFO: task kworker/0:0:4 blocked for more than 120 seconds. [ 244.405543] Tainted: G OE 4.9.0-custom #1 [ 244.405544] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 244.405550] kworker/0:0 D 0 4 2 0x00080000 [ 244.405559] Workqueue: events console_callback [ 244.405564] ffff88045a2cfc00 0000000000000000 ffff880462b75940 ffffffff81c0e500 [ 244.405568] ffff880476419280 ffffc900018f7c90 ffffffff817dcf62 000000000000003c [ 244.405572] 0000000100000000 0000000000000002 ffff880462b75940 ffff880462b75940 [ 244.405573] Call Trace: [ 244.405580] [<ffffffff817dcf62>] ? __schedule+0x222/0x6a0 [ 244.405584] [<ffffffff817dd416>] schedule+0x36/0x80 [ 244.405588] [<ffffffff817e041c>] schedule_timeout+0x1fc/0x390 [ 244.405592] [<ffffffff817df1b4>] __down_common+0xa5/0xf8 [ 244.405598] [<ffffffff810b2ca8>] ? put_prev_entity+0x48/0x710 [ 244.405601] [<ffffffff817df224>] __down+0x1d/0x1f [ 244.405606] [<ffffffff810c71a1>] down+0x41/0x50 [ 244.405611] [<ffffffff810d380a>] console_lock+0x1a/0x40 [ 244.405614] [<ffffffff814e3c03>] console_callback+0x13/0x160 [ 244.405617] [<ffffffff817dcf6a>] ? __schedule+0x22a/0x6a0 [ 244.405623] [<ffffffff810954e3>] process_one_work+0x153/0x3f0 [ 244.405628] [<ffffffff81095cab>] worker_thread+0x12b/0x4b0 [ 244.405633] [<ffffffff81095b80>] ? rescuer_thread+0x350/0x350 [ 244.405637] [<ffffffff8109b473>] kthread+0xd3/0xf0 [ 244.405641] [<ffffffff8109b3a0>] ? kthread_park+0x60/0x60 [ 244.405645] [<ffffffff8109b3a0>] ? kthread_park+0x60/0x60 [ 244.405649] [<ffffffff817e1ee5>] ret_from_fork+0x25/0x30 Signed-off-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.