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zdev: Implement --no-settle

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There are some situations where running "udevadm settle" can result in
a deadlock, such as in the early stages of initial RAM-disk processing.

Introduce a new command-line option --no-settle that can be used to
suppress calling "udevadm settle" to allow chzdev to be run in such
situations.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Peter Oberparleiter
2017-09-01 11:05:53 +02:00
committed by Jan Höppner
parent 7d355b0fec
commit f32bff9688
5 changed files with 23 additions and 0 deletions
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zdev/man/chzdev.8
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@@ -528,6 +528,15 @@ device configuration persistent. Typically such steps include rebuilding the
initial RAM disk, or modifying the kernel command line.
.PP
.
.OD no-settle "" ""
Do not wait for udev processing to complete.
Skips all calls to the udevadm tool that are intended to wait for udev to
finish processing before continuing. There is typically no need to use this
option unless chzdev is run in an environment where udev is not fully
functional (such as in the early phase of an initial RAM disk).
.PP
.
.OD persistent "p" ""
Apply changes to persistent configuration only.