* [PATCH] net: devlink: Remove overzealous WARN_ON with snapshots
@ 2020-08-16 19:26 Andrew Lunn
2020-08-16 19:39 ` Andrew Lunn
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Andrew Lunn @ 2020-08-16 19:26 UTC (permalink / raw)
To: David Miller; +Cc: netdev, Chris Healy, jiri, Andrew Lunn
It is possible to trigger this WARN_ON from user space by triggering a
devlink snapshot with an ID which already exists. We don't need both
-EEXISTS being reported and spamming the kernel log.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
net/core/devlink.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/core/devlink.c b/net/core/devlink.c
index e674f0f46dc2..e5feb87beca7 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4063,7 +4063,7 @@ static int __devlink_snapshot_id_insert(struct devlink *devlink, u32 id)
{
lockdep_assert_held(&devlink->lock);
- if (WARN_ON(xa_load(&devlink->snapshot_ids, id)))
+ if (xa_load(&devlink->snapshot_ids, id))
return -EEXIST;
return xa_err(xa_store(&devlink->snapshot_ids, id, xa_mk_value(0),
--
2.28.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] net: devlink: Remove overzealous WARN_ON with snapshots
2020-08-16 19:26 [PATCH] net: devlink: Remove overzealous WARN_ON with snapshots Andrew Lunn
@ 2020-08-16 19:39 ` Andrew Lunn
2020-08-16 21:21 ` Chris Healy
2020-08-17 4:07 ` David Miller
2 siblings, 0 replies; 4+ messages in thread
From: Andrew Lunn @ 2020-08-16 19:39 UTC (permalink / raw)
To: David Miller; +Cc: netdev, Chris Healy, jiri
On Sun, Aug 16, 2020 at 09:26:38PM +0200, Andrew Lunn wrote:
> It is possible to trigger this WARN_ON from user space by triggering a
> devlink snapshot with an ID which already exists. We don't need both
> -EEXISTS being reported and spamming the kernel log.
Upps. Forgot the net-next in the subject line.
Jiri, should we backport this? I can rebase onto net?
Andrew
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] net: devlink: Remove overzealous WARN_ON with snapshots
2020-08-16 19:26 [PATCH] net: devlink: Remove overzealous WARN_ON with snapshots Andrew Lunn
2020-08-16 19:39 ` Andrew Lunn
@ 2020-08-16 21:21 ` Chris Healy
2020-08-17 4:07 ` David Miller
2 siblings, 0 replies; 4+ messages in thread
From: Chris Healy @ 2020-08-16 21:21 UTC (permalink / raw)
To: Andrew Lunn; +Cc: David Miller, netdev, jiri
With this patch applied, I no longer experience the kernel warning messages.
Tested-by: Chris Healy <cphealy@gmail.com>
On Sun, Aug 16, 2020 at 12:27 PM Andrew Lunn <andrew@lunn.ch> wrote:
>
> It is possible to trigger this WARN_ON from user space by triggering a
> devlink snapshot with an ID which already exists. We don't need both
> -EEXISTS being reported and spamming the kernel log.
>
> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
> ---
> net/core/devlink.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index e674f0f46dc2..e5feb87beca7 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -4063,7 +4063,7 @@ static int __devlink_snapshot_id_insert(struct devlink *devlink, u32 id)
> {
> lockdep_assert_held(&devlink->lock);
>
> - if (WARN_ON(xa_load(&devlink->snapshot_ids, id)))
> + if (xa_load(&devlink->snapshot_ids, id))
> return -EEXIST;
>
> return xa_err(xa_store(&devlink->snapshot_ids, id, xa_mk_value(0),
> --
> 2.28.0
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] net: devlink: Remove overzealous WARN_ON with snapshots
2020-08-16 19:26 [PATCH] net: devlink: Remove overzealous WARN_ON with snapshots Andrew Lunn
2020-08-16 19:39 ` Andrew Lunn
2020-08-16 21:21 ` Chris Healy
@ 2020-08-17 4:07 ` David Miller
2 siblings, 0 replies; 4+ messages in thread
From: David Miller @ 2020-08-17 4:07 UTC (permalink / raw)
To: andrew; +Cc: netdev, cphealy, jiri
From: Andrew Lunn <andrew@lunn.ch>
Date: Sun, 16 Aug 2020 21:26:38 +0200
> It is possible to trigger this WARN_ON from user space by triggering a
> devlink snapshot with an ID which already exists. We don't need both
> -EEXISTS being reported and spamming the kernel log.
>
> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Applied, thanks Andrew.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-08-16 19:26 [PATCH] net: devlink: Remove overzealous WARN_ON with snapshots Andrew Lunn
2020-08-16 19:39 ` Andrew Lunn
2020-08-16 21:21 ` Chris Healy
2020-08-17 4:07 ` David Miller
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