* [PATCH] net: dsa: Remove unsigned expression compared with zero
@ 2021-05-19 10:49 Jiapeng Chong
2021-05-19 18:24 ` Vladimir Oltean
0 siblings, 1 reply; 2+ messages in thread
From: Jiapeng Chong @ 2021-05-19 10:49 UTC (permalink / raw)
To: andrew
Cc: vivien.didelot, f.fainelli, olteanv, davem, kuba, linux, netdev,
linux-kernel, Jiapeng Chong
Variable val is "u32" always >= 0, so val >= 0 condition are redundant.
Clean up the following coccicheck warning:
./drivers/net/dsa/qca8k.c:732:5-8: WARNING: Unsigned expression compared
with zero: val >= 0.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
drivers/net/dsa/qca8k.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 4753228..7b38b8d 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -729,8 +729,7 @@
mutex_unlock(&bus->mdio_lock);
- if (val >= 0)
- val &= QCA8K_MDIO_MASTER_DATA_MASK;
+ val &= QCA8K_MDIO_MASTER_DATA_MASK;
return val;
}
--
1.8.3.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] net: dsa: Remove unsigned expression compared with zero
2021-05-19 10:49 [PATCH] net: dsa: Remove unsigned expression compared with zero Jiapeng Chong
@ 2021-05-19 18:24 ` Vladimir Oltean
0 siblings, 0 replies; 2+ messages in thread
From: Vladimir Oltean @ 2021-05-19 18:24 UTC (permalink / raw)
To: Jiapeng Chong
Cc: andrew, vivien.didelot, f.fainelli, davem, kuba, linux, netdev,
linux-kernel
Hi Jiapeng,
On Wed, May 19, 2021 at 06:49:51PM +0800, Jiapeng Chong wrote:
> Variable val is "u32" always >= 0, so val >= 0 condition are redundant.
>
> Clean up the following coccicheck warning:
>
> ./drivers/net/dsa/qca8k.c:732:5-8: WARNING: Unsigned expression compared
> with zero: val >= 0.
>
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
> ---
> drivers/net/dsa/qca8k.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> index 4753228..7b38b8d 100644
> --- a/drivers/net/dsa/qca8k.c
> +++ b/drivers/net/dsa/qca8k.c
> @@ -729,8 +729,7 @@
>
> mutex_unlock(&bus->mdio_lock);
>
> - if (val >= 0)
> - val &= QCA8K_MDIO_MASTER_DATA_MASK;
> + val &= QCA8K_MDIO_MASTER_DATA_MASK;
>
> return val;
> }
> --
> 1.8.3.1
>
The qca8k driver has some problems with the handling of signed/unsigned
return values. I would suggest a better approach to be to make
qca8k_mii_read32 to return an int value, and keep this check as is.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-05-19 10:49 [PATCH] net: dsa: Remove unsigned expression compared with zero Jiapeng Chong
2021-05-19 18:24 ` Vladimir Oltean
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