Fully-qualify modprobe calls to avoid busybox

If the busybox-static package is installed, the modprobe implementation
used will be the one from busybox, which behaves slightly differently.
Specifically, the busybox implementation does not support `install`
commands from modprobe.d conf files:

https://git.busybox.net/busybox/tree/modutils/modprobe.c?h=1_31_stable#n279

Since mkinitramfs already ensures that /sbin/modprobe is copied into
/sbin for the initrd, it is safe to fully-qualify the modprobe call and
never invoke the busybox version.

docs/framebuffer

@@ -86,7 +86,7 @@ matroxfb)
 	;;
 intelfb|i810fb|i915)
 	# Needs AGP driver loaded
-	modprobe intel-agp
+	/sbin/modprobe intel-agp
 	;;
 uvesafb)
 	# v86d requires /dev/zero and dev/mem, but udev haven't been started yet
@@ -99,9 +99,9 @@ esac
 
 if [ -n "${FB}" ]; then
 	unset MODPROBE_OPTIONS
-	modprobe -q fbcon
+	/sbin/modprobe -q fbcon
 	# shellcheck disable=SC2086
-	modprobe -q ${FB} ${OPTS}
+	/sbin/modprobe -q ${FB} ${OPTS}
 fi
 
 if [ -e /proc/fb ]; then

hook-functions

@@ -97,8 +97,8 @@ manual_add_modules()
 	# configuration lines and embedded softdep information is not
 	# processed.  So we run twice, with and without this option.
 	# shellcheck disable=SC2034
-	{ modprobe --all --set-version="${version?}" --ignore-install --quiet --show-depends "$@";
-	  modprobe --all --set-version="${version}" --quiet --show-depends "$@"; } |
+	{ /sbin/modprobe --all --set-version="${version?}" --ignore-install --quiet --show-depends "$@";
+	  /sbin/modprobe --all --set-version="${version}" --quiet --show-depends "$@"; } |
 	while read -r prefix kmod options ; do
 		if [ "${prefix}" != "insmod" ]; then
 			continue

init

@@ -220,7 +220,7 @@ run_scripts /scripts/init-top
 
 maybe_break modules
 [ "$quiet" != "y" ] && log_begin_msg "Loading essential drivers"
-[ -n "${netconsole}" ] && modprobe netconsole netconsole="${netconsole}"
+[ -n "${netconsole}" ] && /sbin/modprobe netconsole netconsole="${netconsole}"
 load_modules
 [ "$quiet" != "y" ] && log_end_msg
 

scripts/functions

@@ -99,13 +99,13 @@ maybe_break()
 			else
 				opts="-v"
 			fi
-			modprobe ${opts} -a i8042 atkbd ehci-pci ehci-orion \
+			/sbin/modprobe ${opts} -a i8042 atkbd ehci-pci ehci-orion \
 				 ehci-hcd ohci-hcd ohci-pci uhci-hcd usbhid xhci \
 				 xhci-pci xhci-hcd
 			sleep 2
 			for modalias in /sys/bus/hid/devices/*/modalias; do
 				if [ -f "${modalias}" ]; then
-					modprobe ${opts} -b "$(cat "${modalias}")"
+					/sbin/modprobe ${opts} -b "$(cat "${modalias}")"
 				fi
 			done
 		fi
@@ -139,7 +139,7 @@ load_modules()
 				continue
 			fi
 			# shellcheck disable=SC2086
-			modprobe $m
+			/sbin/modprobe $m
 		done < /conf/modules
 	fi
 }

scripts/init-top/all_generic_ide

@@ -17,11 +17,11 @@ esac
 for x in $(cat /proc/cmdline); do
 	case ${x} in
 	all_generic_ide)
-		modprobe ata_generic all_generic_ide=1
+		/sbin/modprobe ata_generic all_generic_ide=1
 		;;
 	all_generic_ide=*)
 		if [ -n "${x#all_generic_ide=}" ]; then
-			modprobe ata_generic all_generic_ide=1
+			/sbin/modprobe ata_generic all_generic_ide=1
 		fi
 		;;
 	esac

scripts/local

@@ -56,7 +56,7 @@ local_device_setup()
 	# Load ubi with the correct MTD partition and return since fstype
 	# doesn't work with a char device like ubi.
 	if [ -n "$UBIMTD" ]; then
-		modprobe ubi "mtd=$UBIMTD"
+		/sbin/modprobe ubi "mtd=$UBIMTD"
 		DEV="${dev_id}"
 		return
 	fi

scripts/nfs

@@ -81,7 +81,7 @@ nfs_mount_root()
 	nfs_top
 
 	# For DHCP
-	modprobe af_packet
+	/sbin/modprobe af_packet
 
 	wait_for_udev 10
 
@@ -130,7 +130,7 @@ nfs_mount_fs()
 	nfs_top
 
 	# For DHCP
-	modprobe af_packet
+	/sbin/modprobe af_packet
 
 	wait_for_udev 10