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From: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Larry Finger <Larry.Finger@lwfinger.net>,
	Phillip Potter <phil@philpotter.co.uk>,
	Pavel Skripkin <paskripkin@gmail.com>,
	linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org,
	David Laight <david.Laight@aculab.com>,
	Dan Carpenter <dan.carpenter@oracle.com>
Subject: Re: [PATCH v7 16/19] staging: r8188eu: clean up rtw_read*() and rtw_write*()
Date: Sat, 18 Sep 2021 13:41:48 +0200	[thread overview]
Message-ID: <2291806.MQVBmByTbm@localhost.localdomain> (raw)
In-Reply-To: <YUSqCYKOulGjk1lZ@kroah.com>

On Friday, September 17, 2021 4:45:29 PM CEST Greg Kroah-Hartman wrote:
> On Fri, Sep 17, 2021 at 09:18:34AM +0200, Fabio M. De Francesco wrote:
> > Clean up rtw_read{8,16,32}() and rtw_write{8,16,32,N}() in 
usb_ops_linux.c.
> > 
> > 1) Rename variables:
> >         length => len
> >         pio_priv => io_priv
> >         pintfhdl => intfhdl
> >         wvalue => address.
> 
> Wait, why are you changing wvalue?  Isn't that the USB name for this
> variable in the USB message sent to the device?  Check the USB spec
> before changing this, that is a common field and probably should not be
> changed.

Oh, sorry. This was due to my very limited knowledge of the USB subsystems 
and its Core API. So I misunderstood the semantics of this "wvalue" argument 
and we'll change it to "value" (just to remove that unnecessary 'w', that I 
guess is for "word"). 

I had thought that the mere knowledge of C and OS kernels (from a theoretical 
perspective) would suffice to work on the code that we change in our patches. 
Now I understand that such a naive approach is clearly wrong.

I have been too lazy to open your LDD 3rd ed. for reading but now I have 
decided that it is time to do it. Furthermore, I have found one more book 
about Linux device drivers and I'm about to read also its "Linux USB device 
drivers" chapter.

I think that by this evening I'll have some basic knowledge of the USB 
subsystem, at least of what is needed to avoid future mistakes like the one 
you noticed. :) 

Thank you very much for the time you spent reviewing our code and for taking 
the first 14 patches,

Fabio

> 
> thanks,
> 
> greg k-h




  reply	other threads:[~2021-09-18 11:46 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17  7:18 [PATCH v7 00/19] staging: r8188eu: shorten and simplify calls chains Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 01/19] staging: r8188eu: remove usb_{read,write}_mem() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 02/19] staging: r8188eu: remove the helpers of rtw_read8() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 03/19] staging: r8188eu: remove the helpers of rtw_read16() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 04/19] staging: r8188eu: remove the helpers of rtw_read32() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 05/19] staging: r8188eu: remove the helpers of usb_write8() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 06/19] staging: r8188eu: remove the helpers of usb_write16() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 07/19] staging: r8188eu: remove the helpers of usb_write32() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 08/19] staging: r8188eu: remove the helpers of usb_writeN() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 09/19] staging: r8188eu: remove the helpers of usb_read_port() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 10/19] staging: r8188eu: remove the helpers of usb_write_port() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 11/19] staging: r8188eu: remove the helpers of usb_read_port_cancel() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 12/19] staging: r8188eu: remove the helpers of usb_write_port_cancel() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 13/19] staging: r8188eu: remove core/rtw_io.c Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 14/19] staging: r8188eu: remove struct _io_ops Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 15/19] staging: r8188eu: clean up usbctrl_vendorreq() Fabio M. De Francesco
2021-09-17 14:44   ` Greg Kroah-Hartman
2021-09-18 11:13     ` Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 16/19] staging: r8188eu: clean up rtw_read*() and rtw_write*() Fabio M. De Francesco
2021-09-17 14:44   ` Greg Kroah-Hartman
2021-09-17 14:45   ` Greg Kroah-Hartman
2021-09-18 11:41     ` Fabio M. De Francesco [this message]
2021-09-17  7:18 ` [PATCH v7 17/19] staging: r8188eu: shorten calls chain of rtw_read{8,16,32}() Fabio M. De Francesco
2021-09-17 14:50   ` Greg Kroah-Hartman
2021-09-17 15:01     ` David Laight
2021-09-17 15:17       ` 'Greg Kroah-Hartman'
2021-09-18 12:19     ` Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 18/19] staging: r8188eu: shorten calls chain of rtw_write{8,16,32,N}() Fabio M. De Francesco
2021-09-17  7:18 ` [PATCH v7 19/19] staging: r8188eu: remove shared buffer for usb requests Fabio M. De Francesco
2021-09-17 14:55   ` Greg Kroah-Hartman
2021-09-17 15:03     ` Pavel Skripkin
2021-09-17 15:06       ` Pavel Skripkin
2021-09-17 15:18       ` Greg Kroah-Hartman
2021-09-17 15:23         ` Pavel Skripkin
2021-09-17 11:07 ` [PATCH v7 00/19] staging: r8188eu: shorten and simplify calls chains Dan Carpenter

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