linux-kernel - Re: [PATCH 2/2] PCI: switchtec: Remove useless assignments in switchtec_dev

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Date:   Thu, 15 Dec 2022 13:07:49 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 2/2] PCI: switchtec: Remove useless assignments in
 switchtec_dev_read()

On Thu, Dec 15, 2022 at 11:34:06AM -0700, Logan Gunthorpe wrote:
> On 2022-12-15 11:21, Bjorn Helgaas wrote:
> > From: Bjorn Helgaas <bhelgaas@...gle.com>
> > 
> > Some switchtec_dev_read() error cases assign to "rc", then branch to "out".
> > But the code at "out" never uses "rc".  Drop the useless assignments.  No
> > functional change intended.
> 
> Ah, hmm, yes. I think if copy_to_user() fails, the function should
> probably return -EFAULT. So perhaps an unlock and specific return as is
> done in previous conditions in the same function?

Sure, I'll post a v2 that does that.