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xen: branch for v5.5-rc2

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Merge tag 'for-linus-5.5b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:
 "Two fixes: one for a resource accounting bug in some configurations
  and a fix for another patch which went into rc1"

* tag 'for-linus-5.5b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/balloon: fix ballooned page accounting without hotplug enabled
  xen-blkback: prevent premature module unload
This commit is contained in:
Linus Torvalds 2019-12-15 12:24:44 -08:00
commit b01d7cb41f
2 changed files with 12 additions and 1 deletions
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10
drivers/block/xen-blkback/xenbus.c
View File

@ -171,6 +171,15 @@ 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;
@ -320,6 +329,7 @@ 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)

3
drivers/xen/balloon.c
View File

@ -394,7 +394,8 @@ static struct notifier_block xen_memory_nb = {
#else
static enum bp_state reserve_additional_memory(void)
{
balloon_stats.target_pages = balloon_stats.current_pages;
balloon_stats.target_pages = balloon_stats.current_pages +
balloon_stats.target_unpopulated;
return BP_ECANCELED;
}
#endif /* CONFIG_XEN_BALLOON_MEMORY_HOTPLUG */