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From: Johan Hovold <johan@kernel.org>
To: Himadri Pandya <himadrispandya@gmail.com>
Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/6] USB: serial: use wrappers for usb_control_msg()
Date: Tue, 21 Sep 2021 13:10:05 +0200	[thread overview]
Message-ID: <YUm9jX6nG+n2q3SV@hovoldconsulting.com> (raw)
In-Reply-To: <20210801203122.3515-1-himadrispandya@gmail.com>

On Mon, Aug 02, 2021 at 02:01:16AM +0530, Himadri Pandya wrote:
> There are many usages of usb_control_msg() that can use the new wrapper
> functions usb_contro_msg_send() & usb_control_msg_recv() for better
> error checks on short reads and writes.

As I said before, there no need to worry about short writes as that will
always return an error. So this description (and some of the commit
messages) needs a bit of work.

> They can also be used to avoid
> allocating redundant dma buffers that are generally required to use
> usb_control_msg(). 

The DMA buffers are anything but redundant; they are required. But the
wrappers can be used to not have to manage the dma buffers explicitly.

> Hence use them whenever possible and avoid using
> usb_control_msg() directly.
> 
> Changes in v2:
>  - Drop unnecessary use of wrappers
>  - Drop unrelated style changes
> 
> Additional Info:
> - This is a super late follow-up on v1 that was submitted a while
> ago(my sincere apologies). (All patches are rebased and
> compile tested.)
> - v1 patches: https://lkml.org/lkml/2020/11/4/40
> - Patches that introduced the wrapper functions:
>   https://lkml.org/lkml/2020/9/14/859

No worries, I'll go review the patches now.

Johan

      parent reply	other threads:[~2021-09-21 11:10 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-01 20:31 Himadri Pandya
2021-08-01 20:31 ` [PATCH v2 1/6] USB: serial: ch314: use usb_control_msg_recv() and usb_control_msg_send() Himadri Pandya
2021-09-21 11:26   ` Johan Hovold
2021-08-01 20:31 ` [PATCH v2 2/6] USB: serial: cp210x: " Himadri Pandya
2021-09-21 11:34   ` Johan Hovold
2021-08-01 20:31 ` [PATCH v2 3/6] USB: serial: f81232: " Himadri Pandya
2021-09-21 12:06   ` Johan Hovold
2021-08-01 20:31 ` [PATCH v2 4/6] USB: serial: ftdi_sio: use usb_control_msg_recv() Himadri Pandya
2021-09-21 12:17   ` Johan Hovold
2021-08-01 20:31 ` [PATCH v2 5/6] USB: serial: keyspan_pda: " Himadri Pandya
2021-09-21 12:27   ` Johan Hovold
2021-08-01 20:31 ` [PATCH v2 6/6] USB: serial: kl5kusb105: use usb_control_msg_recv() and usb_control_msg_send() Himadri Pandya
2021-09-21 12:41   ` Johan Hovold
2021-09-26 13:00     ` Himadri Pandya
2021-09-21 11:10 ` Johan Hovold [this message]

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