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devlink: avoid potential loop in devlink_rel_nested_in_notify_work()

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In case devlink_rel_nested_in_notify_work() can not take the devlink
lock mutex. Convert the work to delayed work and in case of reschedule
do it jiffie later and avoid potential looping.

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Fixes: c137743bce ("devlink: introduce object and nested devlink relationship infra")
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240205171114.338679-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko 2024-02-05 18:11:14 +01:00 • committed by Jakub Kicinski
parent 1279f9d9de
commit 58086721b7
1 changed files with 6 additions and 6 deletions
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12
net/devlink/core.c
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@ -46,7 +46,7 @@ struct devlink_rel {
u32 obj_index; u32 obj_index;
devlink_rel_notify_cb_t *notify_cb; devlink_rel_notify_cb_t *notify_cb;
devlink_rel_cleanup_cb_t *cleanup_cb; devlink_rel_cleanup_cb_t *cleanup_cb;
struct work_struct notify_work; struct delayed_work notify_work;
} nested_in; } nested_in;
}; };
@ -70,7 +70,7 @@ static void __devlink_rel_put(struct devlink_rel *rel)
static void devlink_rel_nested_in_notify_work(struct work_struct *work) static void devlink_rel_nested_in_notify_work(struct work_struct *work)
{ {
struct devlink_rel *rel = container_of(work, struct devlink_rel, struct devlink_rel *rel = container_of(work, struct devlink_rel,
nested_in.notify_work); nested_in.notify_work.work);
struct devlink *devlink; struct devlink *devlink;
devlink = devlinks_xa_get(rel->nested_in.devlink_index); devlink = devlinks_xa_get(rel->nested_in.devlink_index);
@ -96,13 +96,13 @@ rel_put:
return; return;
reschedule_work: reschedule_work:
schedule_work(&rel->nested_in.notify_work); schedule_delayed_work(&rel->nested_in.notify_work, 1);
} }
static void devlink_rel_nested_in_notify_work_schedule(struct devlink_rel *rel) static void devlink_rel_nested_in_notify_work_schedule(struct devlink_rel *rel)
{ {
__devlink_rel_get(rel); __devlink_rel_get(rel);
schedule_work(&rel->nested_in.notify_work); schedule_delayed_work(&rel->nested_in.notify_work, 0);
} }
static struct devlink_rel *devlink_rel_alloc(void) static struct devlink_rel *devlink_rel_alloc(void)
@ -123,8 +123,8 @@ static struct devlink_rel *devlink_rel_alloc(void)
} }
refcount_set(&rel->refcount, 1); refcount_set(&rel->refcount, 1);
INIT_WORK(&rel->nested_in.notify_work, INIT_DELAYED_WORK(&rel->nested_in.notify_work,
&devlink_rel_nested_in_notify_work); &devlink_rel_nested_in_notify_work);
return rel; return rel;
} }