netdev - Re: [patch net-next 1/3] mlxsw: spectrum: Reduce number of supported 802.1D bridges

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Message-Id: <20160518.205040.715594342450511871.davem@davemloft.net>
Date:	Wed, 18 May 2016 20:50:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jiri@...nulli.us
Cc:	netdev@...r.kernel.org, idosch@...lanox.com, eladr@...lanox.com,
	yotamg@...lanox.com, ogerlitz@...lanox.com,
	roopa@...ulusnetworks.com, gospo@...ulusnetworks.com,
	corbet@....net, sfeldma@...il.com, nicolas.dichtel@...nd.com,
	vivien.didelot@...oirfairelinux.com
Subject: Re: [patch net-next 1/3] mlxsw: spectrum: Reduce number of
 supported 802.1D bridges

From: Jiri Pirko <jiri@...nulli.us>
Date: Wed, 18 May 2016 14:40:50 +0200

> This patch, commit b555cf4a50c17a9714715a2d7c8574dca1a7b356 ("mlxsw: spectrum:
> Reduce number of supported 802.1D bridges") reduced the resources the
> device allocates during init. Newer firmware versions now force a hard
> limit on these resources and thus require this patch.
> 
> We would like to ask this commit be backported to stable kernels, so
> that they can be used with newer firmware versions.

Breaking existing working drivers with a firmware update is a terrible
user experience, and in my opinion not a reason to do a -stable
backport.  Fix how you manage this stuff instead.

This new behavior should be requested by drivers that can handle it,
rather than retroactively forced upon existing setups.