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From 4d1b08a69350d40e0aa14baba4797ef175295718 Mon Sep 17 00:00:00 2001
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From: Peter Robinson <pbrobinson@gmail.com>
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Date: Wed, 30 Mar 2016 12:40:54 +0100
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Subject: [PATCH 1/2] net: dsa: mv88e6xxx: Introduce
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_mv88e6xxx_phy_page_{read,write}
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Add versions of the phy_page_read and _write functions to
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be used in a context where the SMI mutex is held.
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Tested-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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Signed-off-by: Patrick Uiterwijk <patrick@puiterwijk.org>
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---
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drivers/net/dsa/mv88e6xxx.c | 49 +++++++++++++++++++++++++++++++++------------
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1 file changed, 36 insertions(+), 13 deletions(-)
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diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
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index 512c8c0..3dcfe13 100644
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--- a/drivers/net/dsa/mv88e6xxx.c
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+++ b/drivers/net/dsa/mv88e6xxx.c
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@@ -1929,6 +1929,38 @@ static void mv88e6xxx_bridge_work(struct work_struct *work)
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}
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}
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+static int _mv88e6xxx_phy_page_write(struct dsa_switch *ds, int port, int page,
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+ int reg, int val)
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+{
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+ int ret;
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+
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+ ret = _mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
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+ if (ret < 0)
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+ goto restore_page_0;
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+
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+ ret = _mv88e6xxx_phy_write_indirect(ds, port, reg, val);
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+restore_page_0:
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+ _mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
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+
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+ return ret;
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+}
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+
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+static int _mv88e6xxx_phy_page_read(struct dsa_switch *ds, int port, int page,
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+ int reg)
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+{
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+ int ret;
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+
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+ ret = _mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
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+ if (ret < 0)
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+ goto restore_page_0;
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+
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+ ret = _mv88e6xxx_phy_read_indirect(ds, port, reg);
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+restore_page_0:
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+ _mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
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+
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+ return ret;
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+}
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+
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static int mv88e6xxx_setup_port(struct dsa_switch *ds, int port)
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{
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struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
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@@ -2383,13 +2415,9 @@ int mv88e6xxx_phy_page_read(struct dsa_switch *ds, int port, int page, int reg)
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int ret;
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mutex_lock(&ps->smi_mutex);
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- ret = _mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
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- if (ret < 0)
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- goto error;
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- ret = _mv88e6xxx_phy_read_indirect(ds, port, reg);
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-error:
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- _mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
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+ ret = _mv88e6xxx_phy_page_read(ds, port, page, reg);
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mutex_unlock(&ps->smi_mutex);
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+
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return ret;
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}
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@@ -2400,14 +2428,9 @@ int mv88e6xxx_phy_page_write(struct dsa_switch *ds, int port, int page,
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int ret;
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mutex_lock(&ps->smi_mutex);
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- ret = _mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
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- if (ret < 0)
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- goto error;
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-
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- ret = _mv88e6xxx_phy_write_indirect(ds, port, reg, val);
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-error:
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- _mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
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+ ret = _mv88e6xxx_phy_page_write(ds, port, page, reg, val);
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mutex_unlock(&ps->smi_mutex);
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+
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return ret;
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}
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--
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2.7.3
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