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ubi: fastmap: Implement produce_free_peb()

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Since 'commit f82290afc8 ("mtd: ubi: Fix worker handling")',
when booting from NAND, on a fresh NAND just after being flashed (and
only in this case), we got the following log:

ubi0: default fastmap pool size: 200
ubi0: default fastmap WL pool size: 100
ubi0: attaching mtd2
ubi0: scanning is finished
ubi0 error: ubi_update_fastmap: could not find any anchor PEB
ubi0 error: ubi_update_fastmap: could not find any anchor PEB
ubi0 error: ubi_wl_get_peb: Unable to get a free PEB from user WL pool
ubi0 error: autoresize: cannot auto-resize volume 1
UBI error: cannot attach mtd2UBI error: cannot initialize UBI, error
-28UBI init error 28

After analysis, in ubi_wl_init(), when performing schedule_erase(),
thread_enabled flag is not yet set to 1, which forbids ubi_do_worker()
to execute pending works.

This has to effect to not populate ubi->free with free physical
eraseblocks.

Following Richard Weinberger's advice, this patch has been
backported from kernel tree :
'commit 1cb8f9776c7d ("ubi: fastmap: Implement produce_free_peb()")'

Tested-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Patrice Chotard 2018-05-22 10:10:51 +02:00 committed by Heiko Schocher
parent 624d2cae34
commit 65c3d25a6a
1 changed files with 29 additions and 0 deletions
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29
drivers/mtd/ubi/fastmap-wl.c
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@ -169,6 +169,30 @@ void ubi_refill_pools(struct ubi_device *ubi)
spin_unlock(&ubi->wl_lock);
}
/**
* produce_free_peb - produce a free physical eraseblock.
* @ubi: UBI device description object
*
* This function tries to make a free PEB by means of synchronous execution of
* pending works. This may be needed if, for example the background thread is
* disabled. Returns zero in case of success and a negative error code in case
* of failure.
*/
static int produce_free_peb(struct ubi_device *ubi)
{
int err;
while (!ubi->free.rb_node && ubi->works_count) {
dbg_wl("do one work synchronously");
err = do_work(ubi);
if (err)
return err;
}
return 0;
}
/**
* ubi_wl_get_peb - get a physical eraseblock.
* @ubi: UBI device description object
@ -211,6 +235,11 @@ again:
}
retried = 1;
up_read(&ubi->fm_eba_sem);
ret = produce_free_peb(ubi);
if (ret < 0) {
down_read(&ubi->fm_eba_sem);
goto out;
}
goto again;
}