component: add support for releasing match data

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The component helper treats the void match data pointer as an opaque
object which needs no further management.  When device nodes being
passed, this is not true: the caller should pass its refcount to the
component helper, and there should be a way to drop the refcount when
the matching information is destroyed.

This patch provides a per-match release method in addition to the match
method to solve this issue.  Rather than using component_match_add(),
users should use component_match_add_release() which takes an additional
function pointer for releasing this reference.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Russell King 2015-11-17 12:08:01 +00:00

parent ffc30b74fd

commit ce657b1cdd

2 changed files with 87 additions and 42 deletions

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include/linux/component.h

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