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f7f04d1983
sg_alloc_table_chained() is called by several drivers, but if it is called before sg_pool_init(), it results in a NULL pointer dereference in sg_pool_alloc(). Since commit9b1d6c8950("lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c"), we rely on module_init(sg_pool_init) is invoked before other module_init calls but this assumption is fragile. I slightly changed the link order while refactoring Kbuild, then uncovered this issue. I should keep the current link order, but depending on a specific call order among module_init is so fragile. We usually define the init order by specifying *_initcall correctly, or delay the driver probing by returning -EPROBE_DEFER. Change module_initcall() to subsys_initcall(), and also delete the pointless module_exit() because lib/sg_pool.c is always compiled as built-in. (CONFIG_SG_POOL is bool) Link: https://lore.kernel.org/all/20220921043946.GA1355561@roeck-us.net/ Link: https://lore.kernel.org/all/8e70837d-d859-dfb2-bf7f-83f8b31467bc@samsung.com/ Fixes:9b1d6c8950("lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c") Reported-by: Guenter Roeck <linux@roeck-us.net> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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.
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.