mainlining shenanigans
353d921468
During execution of the worker that's used to register rpmsg devices
we are safely locking the channels mutex but, when creating a new
endpoint for such devices, we are registering a IPI on the SCP, which
then makes the SCP to trigger an interrupt, lock its own mutex and in
turn register more subdevices.
This creates a circular locking dependency situation, as the mtk_rpmsg
channels_lock will then depend on the SCP IPI lock.
[ 15.447736] ======================================================
[ 15.460158] WARNING: possible circular locking dependency detected
[ 15.460161] 5.17.0-next-20220324+ #399 Not tainted
[ 15.460165] ------------------------------------------------------
[ 15.460166] kworker/0:3/155 is trying to acquire lock:
[ 15.460170] ffff5b4d0eaf1308 (&scp->ipi_desc[i].lock){+.+.}-{4:4}, at: scp_ipi_lock+0x34/0x50 [mtk_scp_ipi]
[ 15.504958]
[] but task is already holding lock:
[ 15.504960] ffff5b4d0e8f1918 (&mtk_subdev->channels_lock){+.+.}-{4:4}, at: mtk_register_device_work_function+0x50/0x1cc [mtk_rpmsg]
[ 15.504978]
[] which lock already depends on the new lock.
[ 15.504980]
[] the existing dependency chain (in reverse order) is:
[ 15.504982]
[] -> #1 (&mtk_subdev->channels_lock){+.+.}-{4:4}:
[ 15.504990] lock_acquire+0x68/0x84
[ 15.504999] __mutex_lock+0xa4/0x3e0
[ 15.505007] mutex_lock_nested+0x40/0x70
[ 15.505012] mtk_rpmsg_ns_cb+0xe4/0x134 [mtk_rpmsg]
[ 15.641684] mtk_rpmsg_ipi_handler+0x38/0x64 [mtk_rpmsg]
[ 15.641693] scp_ipi_handler+0xbc/0x180 [mtk_scp]
[ 15.663905] mt8192_scp_irq_handler+0x44/0xa4 [mtk_scp]
[ 15.663915] scp_irq_handler+0x6c/0xa0 [mtk_scp]
[ 15.685779] irq_thread_fn+0x34/0xa0
[ 15.685785] irq_thread+0x18c/0x240
[ 15.685789] kthread+0x104/0x110
[ 15.709579] ret_from_fork+0x10/0x20
[ 15.709586]
[] -> #0 (&scp->ipi_desc[i].lock){+.+.}-{4:4}:
[ 15.731271] __lock_acquire+0x11e4/0x1910
[ 15.740367] lock_acquire.part.0+0xd8/0x220
[ 15.749813] lock_acquire+0x68/0x84
[ 15.757861] __mutex_lock+0xa4/0x3e0
[ 15.766084] mutex_lock_nested+0x40/0x70
[ 15.775006] scp_ipi_lock+0x34/0x50 [mtk_scp_ipi]
[ 15.785503] scp_ipi_register+0x40/0xa4 [mtk_scp_ipi]
[ 15.796697] scp_register_ipi+0x1c/0x30 [mtk_scp]
[ 15.807194] mtk_rpmsg_create_ept+0xa0/0x108 [mtk_rpmsg]
[ 15.818912] rpmsg_create_ept+0x44/0x60
[ 15.827660] cros_ec_rpmsg_probe+0x15c/0x1f0
[ 15.837282] rpmsg_dev_probe+0x128/0x1d0
[ 15.846203] really_probe.part.0+0xa4/0x2a0
[ 15.855649] __driver_probe_device+0xa0/0x150
[ 15.865443] driver_probe_device+0x48/0x150
[ 15.877157] __device_attach_driver+0xc0/0x12c
[ 15.889359] bus_for_each_drv+0x80/0xe0
[ 15.900330] __device_attach+0xe4/0x190
[ 15.911303] device_initial_probe+0x1c/0x2c
[ 15.922969] bus_probe_device+0xa8/0xb0
[ 15.933927] device_add+0x3a8/0x8a0
[ 15.944193] device_register+0x28/0x40
[ 15.954970] rpmsg_register_device+0x5c/0xa0
[ 15.966782] mtk_register_device_work_function+0x148/0x1cc [mtk_rpmsg]
[ 15.983146] process_one_work+0x294/0x664
[ 15.994458] worker_thread+0x7c/0x45c
[ 16.005069] kthread+0x104/0x110
[ 16.014789] ret_from_fork+0x10/0x20
[ 16.025201]
[] other info that might help us debug this:
[ 16.047769] Possible unsafe locking scenario:
[ 16.063942] CPU0 CPU1
[ 16.075166] ---- ----
[ 16.086376] lock(&mtk_subdev->channels_lock);
[ 16.097592] lock(&scp->ipi_desc[i].lock);
[ 16.113188] lock(&mtk_subdev->channels_lock);
[ 16.129482] lock(&scp->ipi_desc[i].lock);
[ 16.140020]
[] *** DEADLOCK ***
[ 16.158282] 4 locks held by kworker/0:3/155:
[ 16.168978] #0: ffff5b4d00008748 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1fc/0x664
[ 16.190017] #1: ffff80000953bdc8 ((work_completion)(&mtk_subdev->register_work)){+.+.}-{0:0}, at: process_one_work+0x1fc/0x664
[ 16.215269] #2: ffff5b4d0e8f1918 (&mtk_subdev->channels_lock){+.+.}-{4:4}, at: mtk_register_device_work_function+0x50/0x1cc [mtk_rpmsg]
[ 16.242131] #3: ffff5b4d05964190 (&dev->mutex){....}-{4:4}, at: __device_attach+0x44/0x190
To solve this, simply unlock the channels_lock mutex before calling
mtk_rpmsg_register_device() and relock it right after, as safety is
still ensured by the locking mechanism that happens right after
through SCP.
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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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.
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.