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d0ccf760a4During boot, users sometimes observe the following warning:
[7.841431] WARNING: CPU: 4 PID: 492 at
drivers/interconnect/core.c:685 __icc_enable
(drivers/interconnect/core.c:685 (discriminator 7))
[..]
[7.841541] Call trace:
[7.841542] __icc_enable (drivers/interconnect/core.c:685 (discriminator 7))
[7.841545] icc_disable (drivers/interconnect/core.c:708)
[7.841547] geni_icc_disable (drivers/soc/qcom/qcom-geni-se.c:862)
[7.841553] spi_geni_runtime_suspend+0x3c/0x4c spi_geni_qcom
This occurs when the spi-geni driver receives an -EPROBE_DEFER error
from spi_geni_grab_gpi_chan(), causing devres to start releasing all
resources as shown below:
[7.138679] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_icc_release (8 bytes)
[7.138751] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_icc_release (8 bytes)
[7.138827] geni_spi 880000.spi: DEVRES REL ffff800081443800 pm_runtime_disable_action (16 bytes)
[7.139494] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_pm_opp_config_release (16 bytes)
[7.139512] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_spi_release_controller (8 bytes)
[7.139516] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_clk_release (16 bytes)
[7.139519] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_ioremap_release (8 bytes)
[7.139524] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_region_release (24 bytes)
[7.139527] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_kzalloc_release (22 bytes)
[7.139530] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_pinctrl_release (8 bytes)
[7.139539] geni_spi 880000.spi: DEVRES REL ffff800081443800 devm_kzalloc_release (40 bytes)
The issue here is that pm_runtime_disable_action() results in a call to
spi_geni_runtime_suspend(), which attempts to suspend the device and
disable an interconnect path that devm_icc_release() has just released.
Resolve this by calling geni_icc_get() before enabling runtime PM. This
approach ensures that when devres releases resources in reverse order,
it will start with pm_runtime_disable_action(), suspending the device,
and then proceed to free the remaining resources.
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Closes: https://lore.kernel.org/r/CA+G9fYtsjFtddG8i+k-SpV8U6okL0p4zpsTiwGfNH5GUA8dWAA@mail.gmail.com
Fixes:
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History
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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.