net/mlx5e: Don't drop RTNL during firmware flash

net/mlx5e: Don't drop RTNL during firmware flash

There's no explanation in the original commit of why that was done, but
presumably flashing takes a long time and holding RTNL for so long
blocks other interactions with the netdev layer.

However, the stack is moving towards netdev instance locking and
dropping and reacquiring RTNL in the context of flashing introduces
locking ordering issues: RTNL must be acquired before the netdev
instance lock and released after it.

This patch therefore takes the simpler approach by no longer dropping
and reacquiring the RTNL, as soon RTNL for ethtool will be removed,
leaving only the instance lock to protect against races.

Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1747829342-1018757-5-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>