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>
spin_unlock(&ubi->wl_lock);
}
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
/**
* ubi_wl_get_peb - get a physical eraseblock.
* @ubi: UBI device description object
}
retried = 1;
up_read(&ubi->fm_eba_sem);
}
retried = 1;
up_read(&ubi->fm_eba_sem);
+ ret = produce_free_peb(ubi);
+ if (ret < 0) {
+ down_read(&ubi->fm_eba_sem);
+ goto out;
+ }