[PATCH v1 0/3] Clean up and fix error handling in mdio_mux_init()

From: Saravana Kannan <saravanak@google.com>
To: Andrew Lunn <andrew@lunn.ch>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>
Cc: Saravana Kannan <saravanak@google.com>,
	Marc Zyngier <maz@kernel.org>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Kevin Hilman <khilman@baylibre.com>,
	kernel-team@android.com, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v1 0/3] Clean up and fix error handling in mdio_mux_init()
Date: Wed,  4 Aug 2021 14:43:29 -0700	[thread overview]
Message-ID: <20210804214333.927985-1-saravanak@google.com> (raw)

This patch series was started due to -EPROBE_DEFER not being handled
correctly in mdio_mux_init() and causing issues [1]. While at it, I also
did some more error handling fixes and clean ups. The -EPROBE_DEFER fix is
the last patch.

Ideally, in the last patch we'd treat any error similar to -EPROBE_DEFER
but I'm not sure if it'll break any board/platforms where some child
mdiobus never successfully registers. If we treated all errors similar to
-EPROBE_DEFER, then none of the child mdiobus will work and that might be a
regression. If people are sure this is not a real case, then I can fix up
the last patch to always fail the entire mdio-mux init if any of the child
mdiobus registration fails.

Cc: Marc Zyngier <maz@kernel.org>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>
[1] - https://lore.kernel.org/lkml/CAGETcx95kHrv8wA-O+-JtfH7H9biJEGJtijuPVN0V5dUKUAB3A@mail.gmail.com/#t

Saravana Kannan (3):
  net: mdio-mux: Delete unnecessary devm_kfree
  net: mdio-mux: Don't ignore memory allocation errors
  net: mdio-mux: Handle -EPROBE_DEFER correctly

 drivers/net/mdio/mdio-mux.c | 37 ++++++++++++++++++++++++-------------
 1 file changed, 24 insertions(+), 13 deletions(-)

-- 
2.32.0.554.ge1b32706d8-goog