All of lore.kernel.org
 help / color / mirror / Atom feed
From: Greg KH <gregkh@linuxfoundation.org>
To: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Cc: linux-serial@vger.kernel.org, jirislaby@kernel.org,
	jacmet@sunsite.dk, git@xilinx.com
Subject: Re: [PATCH v2] serial-uartlite: Remove an un-necessary read of control register
Date: Wed, 24 Nov 2021 11:07:54 +0100	[thread overview]
Message-ID: <YZ4O+qnkVyhGzuDy@kroah.com> (raw)
In-Reply-To: <20211123131348.26295-1-shubhrajyoti.datta@xilinx.com>

On Tue, Nov 23, 2021 at 06:43:48PM +0530, Shubhrajyoti Datta wrote:
> The control register is a writeonly register that's why reading it
> doesn't make any sense.
> The manual states "This is a write-only register. Issuing a read request
> to the control register generates the read acknowledgment with zero data."

Are you sure this is ok to remove?  Usually you have to do a read after
a write to ensure that the write succeeded.

What ensures that the write succeeded now if you remove this read?

thanks,

greg k-h

  reply	other threads:[~2021-11-24 10:08 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-23 13:13 [PATCH v2] serial-uartlite: Remove an un-necessary read of control register Shubhrajyoti Datta
2021-11-24 10:07 ` Greg KH [this message]
2021-11-24 12:37   ` Shubhrajyoti Datta
2021-11-24 12:45     ` Greg KH
2021-11-26 14:07     ` Maarten Brock
2021-12-15 11:56       ` Michal Simek

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YZ4O+qnkVyhGzuDy@kroah.com \
    --to=gregkh@linuxfoundation.org \
    --cc=git@xilinx.com \
    --cc=jacmet@sunsite.dk \
    --cc=jirislaby@kernel.org \
    --cc=linux-serial@vger.kernel.org \
    --cc=shubhrajyoti.datta@xilinx.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.