UBI: Fastmap: Ensure that only one fastmap work is scheduled

If the WL pool runs out of PEBs we schedule a fastmap write
to refill it as soon as possible.
Ensure that only one at a time is scheduled otherwise we might end in
a fastmap write storm because writing the fastmap can schedule another
write if bitflips are detected.

Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Tanya Brokhman <tlinder@codeaurora.org>
Reviewed-by: Guido Martínez <guido@vanguardiasur.com.ar>

diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 2251a6c..7a33470 100644 (file)
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -431,6 +431,7 @@ struct ubi_debug_info {
  * @fm_size: fastmap size in bytes
  * @fm_sem: allows ubi_update_fastmap() to block EBA table changes
  * @fm_work: fastmap work queue
+ * @fm_work_scheduled: non-zero if fastmap work was scheduled
  *
  * @used: RB-tree of used physical eraseblocks
  * @erroneous: RB-tree of erroneous used physical eraseblocks
@@ -442,7 +443,7 @@ struct ubi_debug_info {
  * @pq_head: protection queue head
  * @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from,
  *          @move_to, @move_to_put @erase_pending, @wl_scheduled, @works,
- *          @erroneous, and @erroneous_peb_count fields
+ *          @erroneous, @erroneous_peb_count, and @fm_work_scheduled fields
  * @move_mutex: serializes eraseblock moves
  * @work_sem: used to wait for all the scheduled works to finish and prevent
  * new works from being submitted
@@ -537,6 +538,7 @@ struct ubi_device {
        void *fm_buf;
        size_t fm_size;
        struct work_struct fm_work;
+       int fm_work_scheduled;
 
        /* Wear-leveling sub-system's stuff */
        struct rb_root used;

diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 0bd92d8..ae174f4 100644 (file)
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -149,6 +149,9 @@ static void update_fastmap_work_fn(struct work_struct *wrk)
 {
        struct ubi_device *ubi = container_of(wrk, struct ubi_device, fm_work);
        ubi_update_fastmap(ubi);
+       spin_lock(&ubi->wl_lock);
+       ubi->fm_work_scheduled = 0;
+       spin_unlock(&ubi->wl_lock);
 }
 
 /**
@@ -657,7 +660,10 @@ static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)
                /* We cannot update the fastmap here because this
                 * function is called in atomic context.
                 * Let's fail here and refill/update it as soon as possible. */
-               schedule_work(&ubi->fm_work);
+               if (!ubi->fm_work_scheduled) {
+                       ubi->fm_work_scheduled = 1;
+                       schedule_work(&ubi->fm_work);
+               }
                return NULL;
        } else {
                pnum = pool->pebs[pool->used++];