linux-kernel - Re: [PATCH] usb: phy: tegra: Use IS

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Date:   Thu, 24 Sep 2020 12:21:39 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Tang Bin <tangbin@...s.chinamobile.com>,
        gregkh@...uxfoundation.org, jonathanh@...dia.com,
        linux-usb@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Zhang Shengju <zhangshengju@...s.chinamobile.com>
Subject: Re: [PATCH] usb: phy: tegra: Use IS_ERR() to check and simplify code

On Thu, Sep 24, 2020 at 10:26:15AM +0300, Felipe Balbi wrote:
> Tang Bin <tangbin@...s.chinamobile.com> writes:
> 
> > Use IS_ERR() and PTR_ERR() instead of PTR_ERR_OR_ZERO() to
> > simplify code, avoid redundant judgements.
> >
> > Signed-off-by: Zhang Shengju <zhangshengju@...s.chinamobile.com>
> > Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
> 
> Applied for next merge window. Make sure to get this driver out of
> drivers/usb/phy and moved into drivers/phy ASAP.

Sergei had commented on this patch with valid concerns, see here in case
you don't have his reply in your inbox:

    http://patchwork.ozlabs.org/project/linux-tegra/patch/20200910115607.11392-1-tangbin@cmss.chinamobile.com/#2526208

I agree with those concerns. This patch is broken because it will output
the wrong error code on failure. I don't fully agree with Sergei's point
that this patch isn't worth redoing. I do like the idiomatic error
handling better, but I think we shouldn't be breaking the error messages
like this.

Thierry

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