From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Mike Nawrocki <michael.nawrocki@gtri.gatech.edu>,
barebox@lists.infradead.org
Subject: Re: [PATCH] drivers: smc911x fix inverted wait_on_timeout
Date: Sun, 31 Jan 2021 20:38:11 +0100 [thread overview]
Message-ID: <a3831f52-27d0-085d-755d-439ea0b415c8@pengutronix.de> (raw)
In-Reply-To: <20210129174435.17699-1-michael.nawrocki@gtri.gatech.edu>
Hello Mike,
On 29.01.21 18:44, Mike Nawrocki wrote:
> The smc911x driver probe routine polls the READY bit using
> wait_on_timeout, which returns 0 on success. The error check following
> the wait_on_timeout invocation in the probe routine interprets a
> returned 0 as failure.
>
> This patch correctly interprets the return value of wait_on_timeout.
Apparently two wrongs indeed make one right..
It used to be !smc911x_reg_read(priv, PMT_CTRL) & PMT_CTRL_READY,
which was flagged by static analysis and I dropped the !, because
it's clearly wrong. Now I understand why it did work..
Thanks for fixing this properly.
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cheers,
Ahmad
>
> Signed-off-by: Mike Nawrocki <michael.nawrocki@gtri.gatech.edu>
> ---
> drivers/net/smc911x.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
> index ea7cea5f1..1edc16ce4 100644
> --- a/drivers/net/smc911x.c
> +++ b/drivers/net/smc911x.c
> @@ -541,7 +541,7 @@ static int smc911x_probe(struct device_d *dev)
> * forbidden while this bit isn't set. Try for 100ms
> */
> ret = wait_on_timeout(100 * MSECOND, smc911x_reg_read(priv, PMT_CTRL) & PMT_CTRL_READY);
> - if (!ret) {
> + if (ret) {
> dev_err(dev, "Device not READY in 100ms aborting\n");
> return -ENODEV;
> }
>
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next prev parent reply other threads:[~2021-01-31 19:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-29 17:44 Mike Nawrocki
2021-01-31 19:38 ` Ahmad Fatoum [this message]
2021-02-01 8:32 ` Sascha Hauer
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