linux-kernel - Re: [PATCH] firmware: stratix10-svc: Fix some error handling paths in 'stratix10_svc_drv

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Date:   Sun, 26 Apr 2020 21:50:06 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Christophe Jaillet <christophe.jaillet@...adoo.fr>,
        Alan Tull <atull@...nel.org>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Moritz Fischer <mdf@...nel.org>,
        Richard Gong <richard.gong@...ux.intel.com>
Subject: Re: [PATCH] firmware: stratix10-svc: Fix some error handling paths in
 'stratix10_svc_drv_probe()'

> If an error occurs after calling 'kfifo_alloc()', the allocated memory
> should be freed with 'kfifo_free()', as already done in the remove
> function.

I suggest to reconsider software development consequences around
another implementation detail for such exception handling.


…
> +++ b/drivers/firmware/stratix10-svc.c
> @@ -1043,24 +1043,31 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
…
>  	svc = devm_kzalloc(dev, sizeof(*svc), GFP_KERNEL);
…
> +	if (!svc) {
> +		ret = -ENOMEM;
> +		goto err_free_kfifo;
> +	}

Would you like to take the possibility into account to avoid
the duplicate specification of this error code assignment
by adding another jump target?

-		return -ENOMEM;
+		goto e_nomem;


>+	return 0;
>+

+e_nomem:
+	ret = -ENOMEM;

>+err_free_kfifo:
>+	kfifo_free(&controller->svc_fifo);
> 	return ret;
>  }


By the way:
How do you think about to omit the error message “failed to allocate FIFO”
for a failed call of the function “kfifo_alloc”?

Regards,
Markus