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driver-core: add driver module asynchronous probe support

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Some init systems may wish to express the desire to have device drivers
run their probe() code asynchronously. This implements support for this
and allows userspace to request async probe as a preference through a
generic shared device driver module parameter, async_probe.

Implementation for async probe is supported through a module parameter
given that since synchronous probe has been prevalent for years some
userspace might exist which relies on the fact that the device driver
will probe synchronously and the assumption that devices it provides
will be immediately available after this.

Signed-off-by: Luis R. Rodriguez <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Luis R. Rodriguez 2015-03-30 16:20:05 -07:00 • committed by Greg Kroah-Hartman
commit f2411da746
5 changed files with 27 additions and 6 deletions
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3
Documentation/kernel-parameters.txt
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@ -943,6 +943,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
auto selects the default scheme, which automatically
enables eagerfpu restore for xsaveopt.
module.async_probe [KNL]
Enable asynchronous probe on this module.
early_ioremap_debug [KNL]
Enable debug messages in early_ioremap support. This
is useful for tracking down temporary early mappings