[openwrt/openwrt] mediatek: mt7622: fix sysupgrade on MMC on BPi-R64

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/86a2dae29a7391f83a0b8d2f85828f72c834b17e

commit 86a2dae29a7391f83a0b8d2f85828f72c834b17e
Author: Daniel Golle <daniel at makrotopia.org>
AuthorDate: Mon Jan 16 21:00:41 2023 +0000

    mediatek: mt7622: fix sysupgrade on MMC on BPi-R64
    
    A previous attempt to simplify things went wrong and now sysupgrade
    is broken on this device. Fix that.
    
    Fixes: d640cbac0e ("mediatek: mt7622: don't rely on existing image for sysupgrade")
    Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh b/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
index e62eba7ef1..d3d503dd1e 100755
--- a/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
+++ b/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
@@ -8,6 +8,7 @@ platform_do_upgrade() {
 	bananapi,bpi-r64)
 		local rootdev="$(cmdline_get_var root)"
 		rootdev="${rootdev##*/}"
+		rootdev="${rootdev%p[0-9]*}"
 		case "$rootdev" in
 		mmc*)
 			CI_ROOTDEV="$rootdev"