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Message-ID: <56F5F71B.3090703@roeck-us.net> Date: Fri, 25 Mar 2016 19:42:35 -0700 From: Guenter Roeck <linux@...ck-us.net> To: Patrick Uiterwijk <patrick@...terwijk.org> Cc: davem@...emloft.net, linux@....linux.org.uk, vivien.didelot@...oirfairelinux.com, andrew@...n.ch, netdev@...r.kernel.org, Dennis Gilmore <dennis@...il.us>, Peter Robinson <pbrobinson@...il.com> Subject: Re: [PATCH 1/2] net: dsa: mv88e6xxx: Introduce _mv88e6xxx_phy_page_{read,write} On 03/25/2016 06:58 PM, Patrick Uiterwijk wrote: > On Sat, Mar 26, 2016 at 2:45 AM, Guenter Roeck <linux@...ck-us.net> wrote: >> On 03/25/2016 05:10 PM, Patrick Uiterwijk wrote: >>> >>> Add versions of the phy_page_read and _write functions to >>> be used in a context where the SMI mutex is held. >>> >>> Signed-off-by: Patrick Uiterwijk <patrick@...terwijk.org> >>> --- >>> drivers/net/dsa/mv88e6xxx.c | 42 >>> ++++++++++++++++++++++++++++++++---------- >>> 1 file changed, 32 insertions(+), 10 deletions(-) >>> >>> diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c >>> index fa086e0..13db5d8 100644 >>> --- a/drivers/net/dsa/mv88e6xxx.c >>> +++ b/drivers/net/dsa/mv88e6xxx.c >>> @@ -2708,37 +2708,59 @@ int mv88e6xxx_switch_reset(struct dsa_switch *ds, >>> bool ppu_active) >>> return 0; >>> } >>> >>> -int mv88e6xxx_phy_page_read(struct dsa_switch *ds, int port, int page, >>> int reg) >>> +static int _mv88e6xxx_phy_page_read(struct dsa_switch *ds, int port, int >>> page, >>> + int reg) >>> { >>> - struct mv88e6xxx_priv_state *ps = ds_to_priv(ds); >>> int ret; >>> >>> - mutex_lock(&ps->smi_mutex); >>> ret = _mv88e6xxx_phy_write_indirect(ds, port, 0x16, page); >>> if (ret < 0) >>> - goto error; >>> + goto clear; >>> ret = _mv88e6xxx_phy_read_indirect(ds, port, reg); >>> -error: >>> +clear: >> >> >> Is there some good reason for changing the name of those labels ? > > Vivien suggested to rename this since it makes more clear that this write is > meant to return to page 0 to make sure that phylib doesn't get confused > about the currently active page. > And "clear:" accomplishes that ? I would not have guessed. Wonder if anyone else does. I would have used a comment. /* Try to return to page 0 even after an error */ or something like that. Guenter > Patrick > >> >> Guenter >> >> >>> _mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0); >>> - mutex_unlock(&ps->smi_mutex); >>> + >>> return ret; >>> } >>> >>> -int mv88e6xxx_phy_page_write(struct dsa_switch *ds, int port, int page, >>> - int reg, int val) >>> +int mv88e6xxx_phy_page_read(struct dsa_switch *ds, int port, int page, >>> int reg) >>> { >>> struct mv88e6xxx_priv_state *ps = ds_to_priv(ds); >>> int ret; >>> >>> mutex_lock(&ps->smi_mutex); >>> + ret = _mv88e6xxx_phy_page_read(ds, port, page, reg); >>> + mutex_unlock(&ps->smi_mutex); >>> + >>> + return ret; >>> +} >>> + >>> +static int _mv88e6xxx_phy_page_write(struct dsa_switch *ds, int port, int >>> page, >>> + int reg, int val) >>> +{ >>> + int ret; >>> + >>> ret = _mv88e6xxx_phy_write_indirect(ds, port, 0x16, page); >>> if (ret < 0) >>> - goto error; >>> + goto clear; >>> >>> ret = _mv88e6xxx_phy_write_indirect(ds, port, reg, val); >>> -error: >>> +clear: >>> _mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0); >>> + >>> + return ret; >>> +} >>> + >>> +int mv88e6xxx_phy_page_write(struct dsa_switch *ds, int port, int page, >>> + int reg, int val) >>> +{ >>> + struct mv88e6xxx_priv_state *ps = ds_to_priv(ds); >>> + int ret; >>> + >>> + mutex_lock(&ps->smi_mutex); >>> + ret = _mv88e6xxx_phy_page_write(ds, port, page, reg, val); >>> mutex_unlock(&ps->smi_mutex); >>> + >>> return ret; >>> } >>> >>> >> >
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