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The pm_vt_switch_required() function fails silently when memory allocation fails, offering no indication to callers that the operation was unsuccessful. This behavior prevents drivers from handling allocation errors correctly or implementing retry mechanisms. By ensuring that failures are reported back to the caller, drivers can make informed decisions, improve robustness, and avoid unexpected behavior during critical power management operations. Change the function signature to return an integer error code and modify the implementation to return -ENOMEM when kmalloc() fails. Update both the function declaration and the inline stub in include/linux/pm.h to maintain consistency across CONFIG_VT_CONSOLE_SLEEP configurations. The function now returns: - 0 on success (including when updating existing entries) - -ENOMEM when memory allocation fails This change improves error reporting without breaking existing callers, as the current callers in drivers/video/fbdev/core/fbmem.c already ignore the return value, making this a backward-compatible improvement. Reviewed-by: Lyude Paul <lyude@redhat.com> Signed-off-by: Malaya Kumar Rout <mrout@redhat.com> Reviewed-by: Dhruva Gole <d-gole@ti.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Link: https://patch.msgid.link/20251013193028.89570-1-mrout@redhat.com Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.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 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.