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Date: Mon, 13 Nov 2017 12:08:49 +0800 From: Phil Reid <preid@...ctromag.com.au> To: Pan Bian <bianpan2016@....com>, Andrew Lunn <andrew@...n.ch>, Vivien Didelot <vivien.didelot@...oirfairelinux.com>, Florian Fainelli <f.fainelli@...il.com> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org Subject: Re: [PATCH] net: dsa: lan9303: correctly check return value of devm_gpiod_get_optional On 12/11/2017 23:38, Pan Bian wrote: > Function devm_gpiod_get_optional() returns an ERR_PTR on failure. Its > return value should not be validated by a NULL check. Instead, use IS_ERR. > > Signed-off-by: Pan Bian <bianpan2016@....com> > --- > drivers/net/dsa/lan9303-core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c > index b471413..6d3fc8f 100644 > --- a/drivers/net/dsa/lan9303-core.c > +++ b/drivers/net/dsa/lan9303-core.c > @@ -828,7 +828,7 @@ static void lan9303_probe_reset_gpio(struct lan9303 *chip, > chip->reset_gpio = devm_gpiod_get_optional(chip->dev, "reset", > GPIOD_OUT_LOW); > > - if (!chip->reset_gpio) { > + if (IS_ERR(chip->reset_gpio)) { > dev_dbg(chip->dev, "No reset GPIO defined\n"); > return; > } > Should not an error actually report the error and error out (ie fail probe). But a null is the optional return and ok. (ie when -ENOENT return from sub gpiod_get call). IS_ERR should be a separate condition check I think. related lan9303_handle_reset() always returns 0. lan9303_probe checks lan9303_handle_reset() return value. Probably should be checking lan9303_probe_reset_gpio() instead. -- Regards Phil Reid
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