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ubi: fastmap: Implement produce_free_peb()

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If fastmap requests a free PEB for a pool and UBI is busy
with erasing PEBs we need to offer a function to wait for one.
We can reuse produce_free_peb() from the non-fastmap WL code
but with different locking semantics.

Cc: stable@vger.kernel.org # 4.1.x-
Reported-and-tested-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2015-08-11 23:27:44 +02:00
parent be186cc4de
commit 1cb8f9776c
1 changed files with 29 additions and 0 deletions
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29
drivers/mtd/ubi/fastmap-wl.c
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@ -171,6 +171,30 @@ 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
@ -213,6 +237,11 @@ int ubi_wl_get_peb(struct ubi_device *ubi)
}
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;
}