From: Jiri Pirko <jiri@resnulli•us>
To: Moshe Shemesh <moshe@mellanox•com>
Cc: "David S. Miller" <davem@davemloft•net>,
Jiri Pirko <jiri@mellanox•com>,
Jakub Kicinski <jakub.kicinski@netronome•com>,
Saeed Mahameed <saeedm@mellanox•com>,
netdev@vger•kernel.org, linux-kernel@vger•kernel.org
Subject: Re: [PATCH net-next] devlink: Change devlink health locking mechanism
Date: Mon, 29 Apr 2019 13:05:11 +0200 [thread overview]
Message-ID: <20190429110511.GD2121@nanopsycho> (raw)
In-Reply-To: <1556530905-9908-1-git-send-email-moshe@mellanox.com>
Mon, Apr 29, 2019 at 11:41:45AM CEST, moshe@mellanox•com wrote:
>The devlink health reporters create/destroy and user commands currently
>use the devlink->lock as a locking mechanism. Different reporters have
>different rules in the driver and are being created/destroyed during
>different stages of driver load/unload/running. So during execution of a
>reporter recover the flow can go through another reporter's destroy and
>create. Such flow leads to deadlock trying to lock a mutex already
>held.
>
>With the new locking mechanism the different reporters share mutex lock
>only to protect access to shared reporters list.
>Added refcount per reporter, to protect the reporters from destroy while
>being used.
>
>Signed-off-by: Moshe Shemesh <moshe@mellanox•com>
Signed-off-by: Jiri Pirko <jiri@mellanox•com>
next prev parent reply other threads:[~2019-04-29 11:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-29 9:41 [PATCH net-next] devlink: Change devlink health locking mechanism Moshe Shemesh
2019-04-29 11:05 ` Jiri Pirko [this message]
2019-04-29 19:29 ` Jakub Kicinski
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