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Date: Sun, 24 Apr 2022 21:33:59 +0200 From: Marek BehĂșn <kabel@...nel.org> To: Andrew Lunn <andrew@...n.ch> Cc: Nathan Rossi <nathan@...hanrossi.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Vivien Didelot <vivien.didelot@...il.com>, Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com> Subject: Re: [PATCH v2] net: dsa: mv88e6xxx: Fix port_hidden_wait to account for port_base_addr On Sun, 24 Apr 2022 21:26:58 +0200 Andrew Lunn <andrew@...n.ch> wrote: > On Sun, Apr 24, 2022 at 03:31:43PM +0000, Nathan Rossi wrote: > > The other port_hidden functions rely on the port_read/port_write > > functions to access the hidden control port. These functions apply the > > offset for port_base_addr where applicable. Update port_hidden_wait to > > use the port_wait_bit so that port_base_addr offsets are accounted for > > when waiting for the busy bit to change. > > > > Without the offset the port_hidden_wait function would timeout on > > devices that have a non-zero port_base_addr (e.g. MV88E6141), however > > devices that have a zero port_base_addr would operate correctly (e.g. > > MV88E6390). > > > > Fixes: ea89098ef9a5 ("net: dsa: mv88x6xxx: mv88e6390 errata") > > That is further back than needed. And due to the code moving around > and getting renamed, you are added extra burden on those doing the > back port for no actual gain. > > Please verify what i suggested, 609070133aff1 is better and then > repost. The bug was introduced by ea89098ef9a5. 609070133aff1 is only requirement for this fix, but Fixes tag should reference the commit which introduced the bug, afaik. So it should be Fixes: ea89098ef9a5 ("net: dsa: mv88x6xxx: mv88e6390 errata") Cc: stable@...r.kernel.org # 609070133aff ("net: dsa: mv88e6xxx: update code operating on hidden registers") Marek
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