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f047159701
Fix the bug below, it may be reproduced after open and close bt about 7000 times: <1>[73036.938137] Unable to handle kernel NULL pointer dereference at virtual address 0000001c <1>[73036.939316] pgd = ffffff800886d000 <1>[73036.939627] [0000001c] *pgd=000000000fffe003, *pud=000000000fffe003, *pmd=0000000000000000 <0>[73036.940396] Internal error: Oops: 96000006 [#1] PREEMPT SMP <4>[73036.940899] Modules linked in: <4>[73036.941193] CPU: 2 PID: 2989 Comm: kworker/2:2 Not tainted 4.4.138 #3 <4>[73036.942409] Workqueue: events hci_uart_write_work <4>[73036.942836] task: ffffffc00d688ac0 task.stack: ffffffc00b184000 <4>[73036.943365] PC is at _raw_spin_lock_irqsave+0x1c/0x50 <4>[73036.943815] LR is at skb_dequeue+0x20/0x74 <4>[73036.944185] pc : [<ffffff8008576398>] lr : [<ffffff800840f9a4>] pstate: 800001c5 <4>[73036.944832] sp : ffffffc00b187d00 <4>[73036.945127] x29: ffffffc00b187d00 x28: 0000000000000000 <4>[73036.945620] x27: 0000000000000000 x26: 0000000000000000 <4>[73036.946114] x25: ffffffc00e1280e0 x24: ffffffc00038d000 <4>[73036.946606] x23: ffffffc00e1271f8 x22: ffffffc00e127f00 <4>[73036.947099] x21: 000000000000001c x20: 0000000000000008 <4>[73036.947592] x19: 0000000000000000 x18: 0000000000000000 <4>[73036.948086] x17: 0000007fade08530 x16: ffffff80080e308c <4>[73036.948579] x15: 0000000000000000 x14: 65736f6c63207568 <4>[73036.949073] x13: 205d303537373339 x12: 2e36333033375b0a <4>[73036.949566] x11: 3220746e63666572 x10: 00000000000006f0 <4>[73036.950060] x9 : ffffffc00b187d30 x8 : ffffffc00d689210 <4>[73036.950553] x7 : 0000000000002d31 x6 : 0000000000000400 <4>[73036.951046] x5 : 0000000000113d82 x4 : 0000000000002f32 <4>[73036.951539] x3 : 0000000000000140 x2 : ffffffc00d688ac0 <4>[73036.952032] x1 : 0000000000000001 x0 : 000000000000001c <4>[73037.068289] [<ffffff8008576398>] _raw_spin_lock_irqsave+0x1c/0x50 <4>[73037.068858] [<ffffff8008377094>] h4_dequeue+0x14/0x1c <4>[73037.069335] [<ffffff8008376924>] hci_uart_write_work+0x50/0x12c <4>[73037.069893] [<ffffff80080abbc8>] process_one_work+0x1b0/0x294 <4>[73037.070426] [<ffffff80080ac920>] worker_thread+0x2d8/0x398 <4>[73037.070935] [<ffffff80080b0f28>] kthread+0xc8/0xd8 <4>[73037.071388] [<ffffff8008082e80>] ret_from_fork+0x10/0x50 thread0 thread1 | | hci_uart_tty_close hci_uart_write_work | | h4_close h4_dequeue | | free (h4_struct) h4 | | _raw_spin_lock_irqsave access h4 null pointer Change-Id: I61d8ad5fb4c9349e0a304d2e87332681240f22e2 Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
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.