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rfkill_rk_probe will fail in some situation after calling wake_lock_init, but in failed situation, wake_lock_destroy is not called, it will cause system crash if userspace program read /sys/kernel/debug/wakeup_sources. Unable to handle kernel NULL pointer dereference at virtual address 00000010 [ 36.171834] pgd = ffffffc0dd710000 [ 36.175230] [00000010] *pgd=00000000dd480003, *pud=00000000dd480003, *pmd=0000000000000000 [ 36.183554] Internal error: Oops: 96000005 [#1] PREEMPT SMP [ 36.189129] Modules linked in: [ 36.192203] CPU: 4 PID: 738 Comm: Binder:605_4 Not tainted 4.4.126 #1 [ 36.198633] Hardware name: Rockchip RK3399 Excavator Board dp(Android) (DT) [ 36.205583] task: ffffffc0cb43de80 task.stack: ffffffc0cac4c000 [ 36.211502] PC is at _raw_spin_lock_irqsave+0x1c/0x50 [ 36.216553] LR is at print_wakeup_source_stats+0x30/0xf0 [ 36.221862] pc : [<ffffff8008b65890>] lr : [<ffffff800853e074>] pstate: a04001c5 [ 36.229242] sp : ffffffc0cac4fc50 [ 36.232554] x29: ffffffc0cac4fc70 x28: ffffffc0cac6ee80 [ 36.237901] x27: ffffffc0ed446f00 x26: ffffffc0cac4fd78 [ 36.243283] x25: ffffffc0cac4feb0 x24: ffffffc0cac6ee40 [ 36.248634] x23: 0000000000000000 x22: 0000000000000010 [ 36.253978] x21: ffffffc0cb43de80 x20: ffffff8009236db8 [ 36.259323] x19: fffffffffffffff8 x18: ffffffc0caf18000 [ 36.264675] x17: 00000070b84c8674 x16: ffffff80081c0e50 [ 36.270020] x15: 0000000000000000 x14: 0000000000000000 [ 36.275358] x13: 000000000000000a x12: 0000000000000020 [ 36.280705] x11: 00000000fffffffb x10: ffffffc0caf17673 [ 36.286051] x9 : 0000000005f5e0ff x8 : 0000000005f5e100 [ 36.291378] x7 : 0000000000012054 x6 : ffffffc0caf17675 [ 36.296711] x5 : 00000000ffffffff x4 : ffffff8008f98e4f [ 36.302054] x3 : 0000000000000140 x2 : ffffffc0cb43de80 [ 36.307398] x1 : 0000000000000001 x0 : 0000000000000010 Call trace: [ 37.884693] [<ffffff8008b65890>] _raw_spin_lock_irqsave+0x1c/0x50 [ 37.890778] [<ffffff800853e1ec>] wakeup_sources_stats_show+0xb8/0xc4 [ 37.897125] [<ffffff80081e2118>] seq_read+0x120/0x404 [ 37.902171] [<ffffff80081bfbc8>] __vfs_read+0x38/0xf4 [ 37.907215] [<ffffff80081c03d4>] vfs_read+0x78/0x12c [ 37.912175] [<ffffff80081c0eac>] SyS_read+0x5c/0xbc [ 37.917055] [<ffffff80080832f0>] el0_svc_naked+0x24/0x28 Signed-off-by: Wenping Zhang <wenping.zhang@rock-chips.com> Change-Id: I57216b16ffdd35bbcf0fda56924bf00a71d152ac
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.