xen-blkback: prevent premature module unload

BugLink: https://bugs.launchpad.net/bugs/1860602
[ Upstream commit fa2ac657f9783f0891b2935490afe9a7fd29d3fa ]

Objects allocated by xen_blkif_alloc come from the 'blkif_cache' kmem
cache. This cache is destoyed when xen-blkif is unloaded so it is
necessary to wait for the deferred free routine used for such objects to
complete. This necessity was missed in commit 14855954f636 "xen-blkback:
allow module to be cleanly unloaded". This patch fixes the problem by
taking/releasing extra module references in xen_blkif_alloc/free()
respectively.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index ed4e8077912432c6973040d80b3a923da1618f1f..e9fa4a1fc791238a418015a0cc29bf5652730a1e 100644 (file)
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -178,6 +178,15 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
        blkif->domid = domid;
        atomic_set(&blkif->refcnt, 1);
        init_completion(&blkif->drain_complete);
+
+       /*
+        * Because freeing back to the cache may be deferred, it is not
+        * safe to unload the module (and hence destroy the cache) until
+        * this has completed. To prevent premature unloading, take an
+        * extra module reference here and release only when the object
+        * has been freed back to the cache.
+        */
+       __module_get(THIS_MODULE);
        INIT_WORK(&blkif->free_work, xen_blkif_deferred_free);
 
        return blkif;
@@ -327,6 +336,7 @@ static void xen_blkif_free(struct xen_blkif *blkif)
 
        /* Make sure everything is drained before shutting down */
        kmem_cache_free(xen_blkif_cachep, blkif);
+       module_put(THIS_MODULE);
 }
 
 int __init xen_blkif_interface_init(void)