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Date: Tue, 7 Dec 2021 20:21:14 -0800 From: Jakub Kicinski <kuba@...nel.org> To: Leon Romanovsky <leon@...nel.org> Cc: "David S . Miller" <davem@...emloft.net>, Ido Schimmel <idosch@...dia.com>, Jiri Pirko <jiri@...dia.com>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [PATCH net-next 0/6] Allow parallel devlink execution On Tue, 7 Dec 2021 09:29:03 +0200 Leon Romanovsky wrote: > On Mon, Dec 06, 2021 at 06:00:27PM -0800, Jakub Kicinski wrote: > > On Sun, 5 Dec 2021 10:22:00 +0200 Leon Romanovsky wrote: > > > This is final piece of devlink locking puzzle, where I remove global > > > mutex lock (devlink_mutex), so we can run devlink commands in parallel. > > > > > > The series starts with addition of port_list_lock, which is needed to > > > prevent locking dependency between netdevsim sysfs and devlink. It > > > follows by the patch that adds context aware locking primitives. Such > > > primitives allow us to make sure that devlink instance is locked and > > > stays locked even during reload operation. The last patches opens > > > devlink to parallel commands. > > > > I'm not okay with assuming that all sub-objects are added when devlink > > is not registered. > > But none of the patches in this series assume that. > > In devlink_nested_lock() patch [1], I added new marker just to make sure > that we don't lock if this specific command is called in locked context. > > +#define DEVLINK_NESTED_LOCK XA_MARK_2 > > [1] https://lore.kernel.org/all/2b64a2a81995b56fec0231751ff6075020058584.1638690564.git.leonro@nvidia.com/ You skip locking if the marker is set. So a register operation can race with a user space operation, right?
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