linux-kernel - Re: [PATCH v3] misc: mei: client.c: fix problem of return '-EOVERFLOW' in mei_cl

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Date:   Mon, 4 Dec 2023 16:11:31 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Su Hui <suhui@...china.com>, alexander.usyskin@...el.com,
        tomas.winkler@...el.com, arnd@...db.de, nathan@...nel.org,
        ndesaulniers@...gle.com, trix@...hat.com,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v3] misc: mei: client.c: fix problem of return
 '-EOVERFLOW' in mei_cl_write

On Mon, Dec 04, 2023 at 09:00:42AM +0100, Greg KH wrote:
> > diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
> > index 7ea80779a0e2..0489bec4fded 100644
> > --- a/drivers/misc/mei/client.c
> > +++ b/drivers/misc/mei/client.c
> > @@ -2033,7 +2033,7 @@ ssize_t mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, unsigned long time
> >  	hbuf_slots = mei_hbuf_empty_slots(dev);
> >  	if (hbuf_slots < 0) {
> >  		rets = -EOVERFLOW;
> > -		goto out;
> > +		goto err;
> 
> Please prove that this is correct, as based on the code logic, it seems
> very wrong.  I can't take this unless the code is tested properly.

Hi Greg,

When Su Hui sent the v2 patch you sent an auto response about adding
stable to the CC list.
https://lore.kernel.org/all/2023112042-napped-snoring-b766@gregkh/

However, it appears that you still applied the v2 patch.  It's in
linux-next as commit ee6236027218 ("misc: mei: client.c: fix problem of
return '-EOVERFLOW' in mei_cl_write").

When I use `git am` to apply this patch, then it doesn't apply.  However,
when I use cat email.txt | patch -p1 then it tries to reverse the patch
and apply it to a different function.

So this a kind of confusing thing.

regards,
dan carpenter