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1ebc180d2b
Dismantle class device last in probe error flow to avoid accessing
freed memory like:
[ 87.926774] WARNING: CPU: 9 PID: 518 at kernel/workqueue.c:4234
__flush_work+0x340/0x390
...
[ 87.926912] Workqueue: async async_run_entry_fn
[ 87.926918] RIP: e030:__flush_work+0x340/0x390
[ 87.926923] Code: 26 9d 05 00 65 48 8b 15 26 3c ca 02 48 85 db 48 8b
04 24 48 89 54 24 58 0f 85 de fe ff ff e9 f6 fd ff ff 0f 0b e9 77 ff ff
ff <0f> 0b e9 70 ff ff ff 0f 0b e9 19 ff ff ff e8 7d 8b 0e 01 48 89 de
[ 87.926931] RSP: e02b:ffffc900412ebc00 EFLAGS: 00010246
[ 87.926936] RAX: 0000000000000000 RBX: ffff888103e55090 RCX: 0000000000000000
[ 87.926941] RDX: 000fffffffe00000 RSI: 0000000000000001 RDI: ffffc900412ebc60
[ 87.926945] RBP: ffff888103e55090 R08: ffffffffc1266ec8 R09: ffff8881109076e8
[ 87.926949] R10: 0000000080040003 R11: 0000000000000000 R12: ffff888103e54000
[ 87.926953] R13: ffffc900412ebc18 R14: 0000000000000001 R15: 0000000000000000
[ 87.926962] FS: 0000000000000000(0000) GS:ffff888233238000(0000) knlGS:0000000000000000
[ 87.926967] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 87.926971] CR2: 00007e7923b32708 CR3: 00000001088df000 CR4: 0000000000050660
[ 87.926977] Call Trace:
[ 87.926981] <TASK>
[ 87.926987] ? __call_rcu_common.constprop.0+0x11e/0x310
[ 87.926993] cancel_work_sync+0x5e/0x80
[ 87.926999] mei_cancel_work+0x19/0x40 [mei]
[ 87.927051] mei_me_probe+0x273/0x2b0 [mei_me]
[ 87.927060] local_pci_probe+0x45/0x90
[ 87.927066] pci_call_probe+0x5b/0x180
[ 87.927070] pci_device_probe+0x95/0x140
[ 87.927074] ? driver_sysfs_add+0x57/0xc0
[ 87.927079] really_probe+0xde/0x340
[ 87.927083] ? pm_runtime_barrier+0x54/0x90
[ 87.927087] __driver_probe_device+0x78/0x110
[ 87.927092] driver_probe_device+0x1f/0xa0
[ 87.927095] __driver_attach_async_helper+0x5e/0xe0
[ 87.927100] async_run_entry_fn+0x34/0x130
[ 87.927104] process_one_work+0x18d/0x340
[ 87.927108] worker_thread+0x256/0x3a0
[ 87.927111] ? __pfx_worker_thread+0x10/0x10
[ 87.927115] kthread+0xfc/0x240
[ 87.927120] ? __pfx_kthread+0x10/0x10
[ 87.927124] ? __pfx_kthread+0x10/0x10
[ 87.927127] ret_from_fork+0xf5/0x110
[ 87.927132] ? __pfx_kthread+0x10/0x10
[ 87.927136] ret_from_fork_asm+0x1a/0x30
[ 87.927141] </TASK>
Tested-by: Guenter Roeck <groeck@google.com>
Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Closes: https://lore.kernel.org/lkml/aQbYAXPADqfiXUYO@mail-itl/
Reported-by: Guenter Roeck <linux@roeck-us.net>
Closes: https://lore.kernel.org/lkml/8deef7c4-ac75-4db8-91b7-02cf0e39e371@roeck-us.net/
Fixes:
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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 reStructuredText markup notation.
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.