6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jakub Kicinski <kuba@xxxxxxxxxx>
commit d772781964415c63759572b917e21c4f7ec08d9f upstream.
xa_find_after() is designed to handle multi-index entries correctly.
If a xarray has two entries one which spans indexes 0-3 and one at
index 4 xa_find_after(0) will return the entry at index 4.
Having to juggle the two callbacks, however, is unnecessary in case
of the devlink xarray, as there is 1:1 relationship with indexes.
Always use xa_find() and increment the index manually.
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Reviewed-by: Jiri Pirko <jiri@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[ Ido: Moved the changes from core.c and devl_internal.h to leftover.c ]
Signed-off-by: Ido Schimmel <idosch@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/devlink/leftover.c | 35 ++++++++++-------------------------
1 file changed, 10 insertions(+), 25 deletions(-)
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -289,15 +289,13 @@ void devl_unlock(struct devlink *devlink
EXPORT_SYMBOL_GPL(devl_unlock);
static struct devlink *
-devlinks_xa_find_get(struct net *net, unsigned long *indexp,
- void * (*xa_find_fn)(struct xarray *, unsigned long *,
- unsigned long, xa_mark_t))
+devlinks_xa_find_get(struct net *net, unsigned long *indexp)
{
- struct devlink *devlink;
+ struct devlink *devlink = NULL;
rcu_read_lock();
retry:
- devlink = xa_find_fn(&devlinks, indexp, ULONG_MAX, DEVLINK_REGISTERED);
+ devlink = xa_find(&devlinks, indexp, ULONG_MAX, DEVLINK_REGISTERED);
if (!devlink)
goto unlock;
@@ -306,31 +304,20 @@ retry:
* This prevents live-lock of devlink_unregister() wait for completion.
*/
if (xa_get_mark(&devlinks, *indexp, DEVLINK_UNREGISTERING))
- goto retry;
+ goto next;
- /* For a possible retry, the xa_find_after() should be always used */
- xa_find_fn = xa_find_after;
if (!devlink_try_get(devlink))
- goto retry;
+ goto next;
if (!net_eq(devlink_net(devlink), net)) {
devlink_put(devlink);
- goto retry;
+ goto next;
}
unlock:
rcu_read_unlock();
return devlink;
-}
-
-static struct devlink *devlinks_xa_find_get_first(struct net *net,
- unsigned long *indexp)
-{
- return devlinks_xa_find_get(net, indexp, xa_find);
-}
-
-static struct devlink *devlinks_xa_find_get_next(struct net *net,
- unsigned long *indexp)
-{
- return devlinks_xa_find_get(net, indexp, xa_find_after);
+next:
+ (*indexp)++;
+ goto retry;
}
/* Iterate over devlink pointers which were possible to get reference to.
@@ -338,9 +325,7 @@ static struct devlink *devlinks_xa_find_
* in loop body in order to release the reference.
*/
#define devlinks_xa_for_each_registered_get(net, index, devlink) \
- for (index = 0, \
- devlink = devlinks_xa_find_get_first(net, &index); \
- devlink; devlink = devlinks_xa_find_get_next(net, &index))
+ for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++)
static struct devlink *devlink_get_from_attrs(struct net *net,
struct nlattr **attrs)
