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xen/xenbus: fix locking

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Commit 060eabe8fb ("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: 060eabe8fb ("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>
This commit is contained in:
Juergen Gross
2020-03-05 11:03:23 +01:00
committed by Boris Ostrovsky
parent 8130b9d5b5
commit 2f69a110e7
3 changed files with 10 additions and 8 deletions
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3
include/xen/xenbus.h
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@@ -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)