linux-kernel - Re: [PATCH] staging: kpc2000: kpc_dma: Convert get_user_pages() --> pin_user

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Date:   Mon, 8 Jun 2020 22:14:59 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     John Hubbard <jhubbard@...dia.com>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        Bharath Vedartham <linux.bhar@...il.com>,
        harshjain32@...il.com, Greg KH <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Simon Sandström <simon@...anor.nu>,
        jane.pnx9@...il.com
Subject: Re: [PATCH] staging: kpc2000: kpc_dma: Convert get_user_pages() -->
 pin_user_pages()

On Tue, Jun 09, 2020 at 12:31:42AM +0530, Souptick Joarder wrote:
> > > @@ -189,10 +192,9 @@ static int kpc_dma_transfer(struct dev_private_data *priv,
> > >       sg_free_table(&acd->sgt);
> > >    err_dma_map_sg:
> > >    err_alloc_sg_table:
> >
> > So now we end up with two unnecessary labels. Probably best to delete two of these
> > three and name the remaining one appropriately:
> 
> Hmm, I thought about it. But later decided to wait for review comments
> on the same in v1.
> I will remove it now.

These are all unrelated to pin_user_pages().  Please don't do it in the
same patch. Staging code is there because it's ugly...  If you don't
want to do unrelated changes to label names then you don't have to.

Also on a personal note.  The label name should say what the goto does
just like a function name says what the function does.  "goto put_pages;"
Or "goto free_foo;".

Don't do this:

	p = kmalloc();
	if (!p)
		goto kmalloc_failed;

This is a come-from label name and does not provide any information that
is not there on the line above...

If you send a patch which uses your own personal style of label names,
I won't say anything about unless there is a bug.  But just know in your
heart that you are wrong and I have silently reviewed your patch to
drivers/staging.

regards,
dan carpenter