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Merge branch 'dep-syswalk-devlink-suppliers' into 'master'

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hook-functions: sys_walk_mod_add: Add devlink suppliers as dependencies

See merge request kernel-team/initramfs-tools!85
This commit is contained in:
Ben Hutchings 2024-05-19 14:10:21 +00:00
commit 46d85003e4
1 changed files with 38 additions and 5 deletions
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43
hook-functions
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@ -316,10 +316,45 @@ copy_modules_dir()
# walk /sys for relevant modules
sys_walk_mod_add()
{
local driver_path module device_path modalias
device_path="$1"
local driver_path module device_path modalias devlink
while [ "${device_path}" != "/sys" ]; do
# This is a crude way of storing two stacks in "$@" by using
# "--" as a separator between them, to implement iterative
# graph traversal over parent/supplier dependencies. The first
# part is device paths to traverse, the other is visited ones.
set -- "$1" "--"
while [ "$1" != "--" ]; do
device_path="$(readlink -f "$1")"
shift
# Don't walk into same path twice, avoid infinite recursion
case "$*" in
"${device_path}") continue ;;
"${device_path} "*) continue ;;
*" ${device_path} "*) continue ;;
*" ${device_path}") continue ;;
esac
if [ "$device_path" = "/sys" ]; then
continue
fi
# Keep current path to add module/modalias for
set -- "$@" "$device_path"
# Walk into suppliers in next iteration
for devlink in "${device_path}/supplier:"*; do
if [ -d "$devlink" ]; then
set -- "${devlink}/supplier/" "$@"
fi
done
# Walk into parent in next iteration
set -- "$(dirname "$device_path")" "$@"
done
shift
for device_path in "$@"; do
# device modalias
if [ -e "${device_path}/modalias" ]; then
modalias=$(cat "${device_path}/modalias")
@ -336,8 +371,6 @@ sys_walk_mod_add()
manual_add_modules "${module}"
fi
fi
device_path="$(dirname "${device_path}")"
done
}