#!/bin/bash

# exit on error
set -e

ubidetach -p /dev/mtd0 2>/dev/null || true
modprobe -r ubi 2>/dev/null || true
modprobe -r nandsim 2>/dev/null || true

mtd=/dev/mtd0
ubi=/dev/ubi0

# 2GB, 8-bits, page size 4KB, OOB 128B, block 128KB
ID="0x20,0xa5,0x00,0x16"
TSIZE=400MiB

modprobe nandsim id_bytes=$ID
flash_erase -q -j $mtd 0 0
modprobe ubi

ubiattach -p $mtd
ubimkvol $ubi -N test -s $TSIZE

exit 0

[   32.228248] ubi0 error: ubi_wl_get_peb [ubi]: Unable to get a free PEB from user WL pool
[   32.229321] ubi0 warning: ubi_eba_atomic_leb_change [ubi]: switch to read-only mode
[   32.230341] CPU: 0 PID: 7439 Comm: ubimkvol Not tainted 5.10.0-14014-g00455bffe746-dirty #345
[   32.231444] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc314
[   32.233152] Call Trace:
[   32.233494]  ? dump_stack+0xa6/0xd5
[   32.233958]  ? ubi_eba_atomic_leb_change+0x45e/0x470 [ubi]
[   32.234678]  ? ubi_update_layout_vol+0x48/0x70 [ubi]
[   32.235327]  ? ubi_change_vtbl_record+0x9e/0x140 [ubi]
[   32.235995]  ? ubi_create_volume+0x63c/0x830 [ubi]
[   32.236627]  ? ubi_cdev_ioctl+0xc14/0x1170 [ubi]
[   32.237228]  ? __se_sys_ioctl+0xda/0x130
[   32.237740]  ? __x64_sys_ioctl+0x1e/0x30
[   32.238255]  ? do_syscall_64+0x45/0x70
[   32.238741]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.239967] ubi0 error: ubi_create_volume [ubi]: cannot create volume 0, error -28

diff --git a/drivers/mtd/ubi/fastmap-wl.c b/drivers/mtd/ubi/fastmap-wl.c
index 0ee452275578..b4f095e1dc09 100644
--- a/drivers/mtd/ubi/fastmap-wl.c
+++ b/drivers/mtd/ubi/fastmap-wl.c
@@ -187,6 +187,7 @@ void ubi_refill_pools(struct ubi_device *ubi)
 			break;
 	}
 
+	pr_err("pool->size %d\n", pool->size);
 	wl_pool->used = 0;
 	pool->used = 0;
 
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 55bae06cf408..479b1b16f34d 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -185,12 +185,15 @@ static void wl_entry_destroy(struct ubi_device *ubi, struct ubi_wl_entry *e)
  * This function returns zero in case of success and a negative error code in
  * case of failure.
  */
+#include <linux/delay.h>
 static int do_work(struct ubi_device *ubi)
 {
 	int err;
 	struct ubi_work *wrk;
 
 	cond_resched();
+	if (ubi->free.rb_node)
+		msleep(2000);
 
 	/*
 	 * @ubi->work_sem is used to synchronize with the workers. Workers take

ubimkvol: error!: cannot UBI create volume

          error 28 (No space left on device)

setup ubifs failed

[   32.228248] ubi0 error: ubi_wl_get_peb [ubi]: Unable to get a free PEB from user WL pool
[   32.229321] ubi0 warning: ubi_eba_atomic_leb_change [ubi]: switch to read-only mode
[   32.230341] CPU: 0 PID: 7439 Comm: ubimkvol Not tainted 5.10.0-14014-g00455bffe746-dirty #345
[   32.231444] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc314
[   32.233152] Call Trace:
[   32.233494]  ? dump_stack+0xa6/0xd5
[   32.233958]  ? ubi_eba_atomic_leb_change+0x45e/0x470 [ubi]
[   32.234678]  ? ubi_update_layout_vol+0x48/0x70 [ubi]
[   32.235327]  ? ubi_change_vtbl_record+0x9e/0x140 [ubi]
[   32.235995]  ? ubi_create_volume+0x63c/0x830 [ubi]
[   32.236627]  ? ubi_cdev_ioctl+0xc14/0x1170 [ubi]
[   32.237228]  ? __se_sys_ioctl+0xda/0x130
[   32.237740]  ? __x64_sys_ioctl+0x1e/0x30
[   32.238255]  ? do_syscall_64+0x45/0x70
[   32.238741]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.239967] ubi0 error: ubi_create_volume [ubi]: cannot create volume 0, error -28