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Message-ID: <206e8c249f630abd3661deb36b84b26282241040.1743510317.git.leon@kernel.org> Date: Tue, 1 Apr 2025 15:28:46 +0300 From: Leon Romanovsky <leon@...nel.org> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Dave Ertman <david.m.ertman@...el.com>, Ira Weiny <ira.weiny@...el.com>, linux-kernel@...r.kernel.org Subject: [PATCH next 1/2] drivers/base: Extend documentation with preferred way to use auxbus Document the preferred way to use auxiliary bus. Signed-off-by: Leon Romanovsky <leon@...nel.org> --- drivers/base/auxiliary.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c index afa4df4c5a3f..248d3508ca0e 100644 --- a/drivers/base/auxiliary.c +++ b/drivers/base/auxiliary.c @@ -156,6 +156,16 @@ * }, * .ops = my_custom_ops, * }; + * + * Please note that such custom ops approach is valid, but it is hard to implement + * it right without global locks per-device to protect from auxiliary_drv removal + * during call to that ops. In addition, this implementation lacks proper module + * dependency, which causes to load/unload races between auxiliary parent and devices + * modules. + * + * The most easiest way to provide these ops reliably whtout need to have lock is + * to EXPORT_SYMBOL*() them and rely on already existing modules infrastructure for validity + * and correct dependencies chains. */ static const struct auxiliary_device_id *auxiliary_match_id(const struct auxiliary_device_id *id, -- 2.48.1
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