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authorJuergen Gross <jgross@suse.com>2020-03-05 11:03:23 +0100
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2020-03-05 09:42:23 -0600
commit2f69a110e7bba3ec6bc089a2f736ca0941d887ed (patch)
tree57ffc62e0497d2f1be6ad89f9abd7c8adbdde722 /include/xen
parentxenbus: req->err should be updated before req->state (diff)
downloadwireguard-linux-2f69a110e7bba3ec6bc089a2f736ca0941d887ed.tar.xz
wireguard-linux-2f69a110e7bba3ec6bc089a2f736ca0941d887ed.zip
xen/xenbus: fix locking
Commit 060eabe8fbe726 ("xenbus/backend: Protect xenbus callback with lock") introduced a bug by holding a lock while calling a function which might schedule. Fix that by using a semaphore instead. Fixes: 060eabe8fbe726 ("xenbus/backend: Protect xenbus callback with lock") Signed-off-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20200305100323.16736-1-jgross@suse.com Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/xenbus.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h
index 89a889585ba0..850a43bd69d3 100644
--- a/include/xen/xenbus.h
+++ b/include/xen/xenbus.h
@@ -42,6 +42,7 @@
#include <linux/completion.h>
#include <linux/init.h>
#include <linux/slab.h>
+#include <linux/semaphore.h>
#include <xen/interface/xen.h>
#include <xen/interface/grant_table.h>
#include <xen/interface/io/xenbus.h>
@@ -76,7 +77,7 @@ struct xenbus_device {
enum xenbus_state state;
struct completion down;
struct work_struct work;
- spinlock_t reclaim_lock;
+ struct semaphore reclaim_sem;
};
static inline struct xenbus_device *to_xenbus_device(struct device *dev)