nixiaoming c79dde629d tty fix oops when rmmod 8250 ... After rmmod 8250.ko tty_kref_put starts kwork (release_one_tty) to release proc interface oops when accessing driver->driver_name in proc_tty_unregister_driver Use jprobe, found driver->driver_name point to 8250.ko static static struct uart_driver serial8250_reg .driver_name= serial, Use name in proc_dir_entry instead of driver->driver_name to fix oops test on linux 4.1.12: BUG: unable to handle kernel paging request at ffffffffa01979de IP: [<ffffffff81310f40>] strchr+0x0/0x30 PGD 1a0d067 PUD 1a0e063 PMD 851c1f067 PTE 0 Oops: 0000 [#1] PREEMPT SMP Modules linked in: ... ... [last unloaded: 8250] CPU: 7 PID: 116 Comm: kworker/7:1 Tainted: G O 4.1.12 #1 Hardware name: Insyde RiverForest/Type2 - Board Product Name1, BIOS NE5KV904 12/21/2015 Workqueue: events release_one_tty task: ffff88085b684960 ti: ffff880852884000 task.ti: ffff880852884000 RIP: 0010:[<ffffffff81310f40>] [<ffffffff81310f40>] strchr+0x0/0x30 RSP: 0018:ffff880852887c90 EFLAGS: 00010282 RAX: ffffffff81a5eca0 RBX: ffffffffa01979de RCX: 0000000000000004 RDX: ffff880852887d10 RSI: 000000000000002f RDI: ffffffffa01979de RBP: ffff880852887cd8 R08: 0000000000000000 R09: ffff88085f5d94d0 R10: 0000000000000195 R11: 0000000000000000 R12: ffffffffa01979de R13: ffff880852887d00 R14: ffffffffa01979de R15: ffff88085f02e840 FS: 0000000000000000(0000) GS:ffff88085f5c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffa01979de CR3: 0000000001a0c000 CR4: 00000000001406e0 Stack: ffffffff812349b1 ffff880852887cb8 ffff880852887d10 ffff88085f5cd6c2 ffff880852800a80 ffffffffa01979de ffff880852800a84 0000000000000010 ffff88085bb28bd8 ffff880852887d38 ffffffff812354f0 ffff880852887d08 Call Trace: [<ffffffff812349b1>] ? __xlate_proc_name+0x71/0xd0 [<ffffffff812354f0>] remove_proc_entry+0x40/0x180 [<ffffffff815f6811>] ? _raw_spin_lock_irqsave+0x41/0x60 [<ffffffff813be520>] ? destruct_tty_driver+0x60/0xe0 [<ffffffff81237c68>] proc_tty_unregister_driver+0x28/0x40 [<ffffffff813be548>] destruct_tty_driver+0x88/0xe0 [<ffffffff813be5bd>] tty_driver_kref_put+0x1d/0x20 [<ffffffff813becca>] release_one_tty+0x5a/0xd0 [<ffffffff81074159>] process_one_work+0x139/0x420 [<ffffffff810745a1>] worker_thread+0x121/0x450 [<ffffffff81074480>] ? process_scheduled_works+0x40/0x40 [<ffffffff8107a16c>] kthread+0xec/0x110 [<ffffffff81080000>] ? tg_rt_schedulable+0x210/0x220 [<ffffffff8107a080>] ? kthread_freezable_should_stop+0x80/0x80 [<ffffffff815f7292>] ret_from_fork+0x42/0x70 [<ffffffff8107a080>] ? kthread_freezable_should_stop+0x80/0x80 Signed-off-by: nixiaoming <nixiaoming@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2017-10-20 14:06:45 +02:00
..
array.c	sched/debug: Add explicit TASK_PARKED printing	2017-09-29 11:02:57 +02:00
base.c	mm: treewide: remove GFP_TEMPORARY allocation flag	2017-09-13 18:53:16 -07:00
cmdline.c	fs/proc: don't use module_init for non-modular core code	2014-01-23 16:37:02 -08:00
consoles.c	fs/proc: don't use module_init for non-modular core code	2014-01-23 16:37:02 -08:00
cpuinfo.c	fs/proc: don't use module_init for non-modular core code	2014-01-23 16:37:02 -08:00
devices.c	block: order /proc/devices by major number	2017-07-17 15:42:20 +02:00
fd.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>	2017-03-02 08:42:29 +01:00
fd.h	proc: unsigned file descriptors	2016-09-27 18:47:38 -04:00
generic.c	procfs: use faster rb_first_cached()	2017-09-08 18:26:49 -07:00
inode.c	fs/proc/inode.c: remove cast from memory allocation	2017-05-08 17:15:10 -07:00
internal.h	procfs: use faster rb_first_cached()	2017-09-08 18:26:49 -07:00
interrupts.c	fs/proc: don't use module_init for non-modular core code	2014-01-23 16:37:02 -08:00
Kconfig	fs, proc: add help for CONFIG_PROC_CHILDREN	2015-07-17 16:39:52 -07:00
kcore.c	fs/proc: kcore: use kcore_list type to check for vmalloc/module address	2017-06-20 12:42:57 +01:00
kmsg.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
loadavg.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/stat.h>	2017-03-02 08:42:34 +01:00
Makefile	fs/proc: Add compiler check for -Wno-override-init to support gcc < 4.2	2016-08-03 12:45:23 -04:00
meminfo.c	mm: rename global_page_state to global_zone_page_state	2017-09-06 17:27:29 -07:00
namespaces.c	pidns: expose task pid_ns_for_children to userspace	2017-05-08 17:15:12 -07:00
nommu.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
page.c	mm: fix KPF_SWAPCACHE in /proc/kpageflags	2017-02-07 12:08:32 -08:00
proc_net.c	procfs: use faster rb_first_cached()	2017-09-08 18:26:49 -07:00
proc_sysctl.c	Merge branch 'akpm' (patches from Andrew)	2017-07-13 12:38:49 -07:00
proc_tty.c	tty fix oops when rmmod 8250	2017-10-20 14:06:45 +02:00
root.c	procfs: use faster rb_first_cached()	2017-09-08 18:26:49 -07:00
self.c	vfs: remove ".readlink = generic_readlink" assignments	2016-12-09 16:45:04 +01:00
softirqs.c	fs/proc: don't use module_init for non-modular core code	2014-01-23 16:37:02 -08:00
stat.c	sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>	2017-03-02 08:42:39 +01:00
task_mmu.c	mm: treewide: remove GFP_TEMPORARY allocation flag	2017-09-13 18:53:16 -07:00
task_nommu.c	procfs: remove unused variable	2017-09-13 18:53:15 -07:00
thread_self.c	vfs: remove ".readlink = generic_readlink" assignments	2016-12-09 16:45:04 +01:00
uptime.c	sched/cputime: Convert kcpustat to nsecs	2017-02-01 09:13:47 +01:00
version.c	fs/proc: don't use module_init for non-modular core code	2014-01-23 16:37:02 -08:00
vmcore.c	userfaultfd: non-cooperative: add event for memory unmaps	2017-02-24 17:46:55 -08:00