linux-kernel - Re: [PATCH 3/4 v3] staging: gpib: Fix erroneous removal of blank before newline

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Message-ID: <36f9a87e-ad02-45e6-a8a0-8da65461b346@stanley.mountain>
Date: Thu, 5 Dec 2024 13:06:10 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Dave Penkler <dpenkler@...il.com>
Cc: gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Marcello Carla' <marcello.carla@....com>
Subject: Re: [PATCH 3/4 v3] staging: gpib: Fix erroneous removal of blank
 before newline

On Thu, Dec 05, 2024 at 10:34:42AM +0100, Dave Penkler wrote:
> The USB_GPIB_SET_LINES command string used to be: "\nIBDC \n" but when
> we were merging this code into the upstream kernel we deleted the space
> character before the newline to make checkpatch happy.  That turned
> out to be a mistake.
> 
> The "\nIBDC" part of the string is a command that we pass to the
> firmware and the next character is a variable u8 value.
> It gets set in set_control_line().
> 
>  msg[leng - 2] = value ? (retval & ~line) : retval | line;
> 
> where leng is the length of the command string.
> 
> Imagine the parameter was supposed to be "8".
> With the pre-merge code the command string would be "\nIBDC8\n"
> With the post-merge code the command string became "\nIBD8\n"
> 
> The firmware doesn't recognize "IBD8" as a valid command and rejects it.
> 
> Putting a "." where the parameter is supposed to go fixes the driver
> and makes checkpatch happy.  Same thing with the other define and
> the in-line assignment.
> 
> Reported-by: Marcello Carla' <marcello.carla@....com>
> Fixes: fce79512a96a ("staging: gpib: Add LPVO DIY USB GPIB driver")
> Co-developed-by: Marcello Carla' <marcello.carla@....com>
> Signed-off-by: Marcello Carla' <marcello.carla@....com>
> Signed-off-by: Dave Penkler <dpenkler@...il.com>
> ---

Thank you!

Reviewed-by: Dan Carpenter <dan.carpenter@...aro.org>

regards,
dan carpenter