linux-kernel - Re: [PATCH v5 2/2] misc: nxp-sr1xx: UWB driver support for sr1xx series chip

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Date:   Wed, 14 Sep 2022 16:55:11 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Manjunatha Venkatesh <manjunatha.venkatesh@....com>
Cc:     linux-kernel@...r.kernel.org, will@...nel.org, axboe@...nel.dk,
        robh+dt@...nel.org, mb@...htnvm.io, ckeepax@...nsource.cirrus.com,
        arnd@...db.d, mst@...hat.com, javier@...igon.com,
        mikelley@...rosoft.com, jasowang@...hat.com,
        sunilmut@...rosoft.com, bjorn.andersson@...aro.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        ashish.deshpande@....com, rvmanjumce@...il.com
Subject: Re: [PATCH v5 2/2] misc: nxp-sr1xx: UWB driver support for sr1xx
 series chip

On Wed, Sep 14, 2022 at 07:59:44PM +0530, Manjunatha Venkatesh wrote:
> +/**
> + * sr1xx_dev_transceive
> + * @op_mode indicates write/read operation
> + *
> + * Write and Read logic implemented under same api with
> + * mutex lock protection so write and read synchronized
> + *
> + * During Uwb ranging sequence(read) need to block write sequence
> + * in order to avoid some race condition scenarios.
> + *
> + * Returns     : Number of bytes write/read if read is success else (-1)

I'm sure I mentioned this before, but NEVER use magic "-1" as an error
value.  Use the real in-kernel -ERROR numbers for error codes please.
This needs to be fixed in many places in this code.

thanks,

greg k-h