Merge tag 'for-5.18/block-2022-04-01' of git://git.kernel.dk/linux-block

[sfrench/cifs-2.6.git] / block / blk-cgroup.c

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 0430926426fe3401d0493e193f9c5587c3634add..8dfe62786cd5fa5eae77afed283fcff238070835 100644 (file)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -65,19 +65,12 @@ static bool blkcg_policy_enabled(struct request_queue *q,
        return pol && test_bit(pol->plid, q->blkcg_pols);
 }
 
-/**
- * blkg_free - free a blkg
- * @blkg: blkg to free
- *
- * Free @blkg which may be partially allocated.
- */
-static void blkg_free(struct blkcg_gq *blkg)
+static void blkg_free_workfn(struct work_struct *work)
 {
+       struct blkcg_gq *blkg = container_of(work, struct blkcg_gq,
+                                            free_work);
        int i;
 
-       if (!blkg)
-               return;
-
        for (i = 0; i < BLKCG_MAX_POLS; i++)
                if (blkg->pd[i])
                        blkcg_policy[i]->pd_free_fn(blkg->pd[i]);
@@ -89,6 +82,25 @@ static void blkg_free(struct blkcg_gq *blkg)
        kfree(blkg);
 }
 
+/**
+ * blkg_free - free a blkg
+ * @blkg: blkg to free
+ *
+ * Free @blkg which may be partially allocated.
+ */
+static void blkg_free(struct blkcg_gq *blkg)
+{
+       if (!blkg)
+               return;
+
+       /*
+        * Both ->pd_free_fn() and request queue's release handler may
+        * sleep, so free us by scheduling one work func
+        */
+       INIT_WORK(&blkg->free_work, blkg_free_workfn);
+       schedule_work(&blkg->free_work);
+}
+
 static void __blkg_release(struct rcu_head *rcu)
 {
        struct blkcg_gq *blkg = container_of(rcu, struct blkcg_gq, rcu_head);