From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Saravana Kannan <saravanak@google.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>,
Rob Herring <robh@kernel.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Nicolas Saenz Julienne <nsaenz@kernel.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
patches@armlinux.org.uk, kernel-team@android.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6] amba: Remove deferred device addition
Date: Wed, 27 Jul 2022 23:16:08 +0100 [thread overview]
Message-ID: <YuG5KCksLWzThSmF@shell.armlinux.org.uk> (raw)
In-Reply-To: <20220727181936.3250466-1-saravanak@google.com>
On Wed, Jul 27, 2022 at 11:19:35AM -0700, Saravana Kannan wrote:
> The uevents generated for an amba device need PID and CID information
> that's available only when the amba device is powered on, clocked and
> out of reset. So, if those resources aren't available, the information
> can't be read to generate the uevents. To workaround this requirement,
> if the resources weren't available, the device addition was deferred and
> retried periodically.
>
> However, this deferred addition retry isn't based on resources becoming
> available. Instead, it's retried every 5 seconds and causes arbitrary
> probe delays for amba devices and their consumers.
>
> Also, maintaining a separate deferred-probe like mechanism is
> maintenance headache.
>
> With this commit, instead of deferring the device addition, we simply
> defer the generation of uevents for the device and probing of the device
> (because drivers needs PID and CID to match) until the PID and CID
> information can be read. This allows us to delete all the amba specific
> deferring code and also avoid the arbitrary probing delays.
Oh, this is absolutely horrible. I can apply it cleanly to my "misc"
branch, but it then conflicts when I re-merge my tree for the for-next
thing (which is only supposed to be for sfr - the hint is in the name!)
for-next is basically my "fixes" plus "misc" branch and anything else I
want sfr to pick up for the -next tree.
Applying this has to be on top of that merge commit, otherwise the
conflicts are horrid, but that then means I need to send Linus the
for-next merge commit (which I don't normally do.)
Gah, we have too many changes to drivers/bus/amba.c in this cycle,
some of them which have been submitted for 5.19 as fixes (and thus
are not in 5.18-rc1 which the misc branch is based upon for other
patch dependency reasons) and others in the misc branch for the next
cycle - and now your patch wants both, which I can't do without
rebasing the misc branch.
Sadly, getting these changes into GregKH's tree will just create a
conflict between Greg's tree and my tree.
Can we postpone this please?
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2022-07-27 22:18 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-27 18:19 [PATCH v6] amba: Remove deferred device addition Saravana Kannan
2022-07-27 22:16 ` Russell King (Oracle) [this message]
2022-07-28 0:10 ` Saravana Kannan
2022-07-28 14:16 ` Russell King (Oracle)
2022-07-28 18:29 ` Saravana Kannan
2022-08-09 10:30 ` Guenter Roeck
2022-08-10 0:42 ` Saravana Kannan
2022-08-10 1:34 ` Guenter Roeck
2022-08-10 3:33 ` Saravana Kannan
2022-08-10 12:58 ` Guenter Roeck
2022-08-10 21:47 ` Isaac Manjarres
2022-08-11 2:03 ` Guenter Roeck
2022-08-11 2:28 ` Saravana Kannan
2022-08-11 4:09 ` Guenter Roeck
2022-08-11 16:51 ` Isaac Manjarres
2022-08-11 19:18 ` Isaac Manjarres
2022-08-11 19:55 ` Guenter Roeck
2022-08-12 5:12 ` Isaac Manjarres
2022-08-12 15:19 ` Guenter Roeck
2022-08-12 15:30 ` Guenter Roeck
2022-08-15 18:43 ` Isaac Manjarres
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=YuG5KCksLWzThSmF@shell.armlinux.org.uk \
--to=linux@armlinux.org.uk \
--cc=geert+renesas@glider.be \
--cc=gregkh@linuxfoundation.org \
--cc=kernel-team@android.com \
--cc=linus.walleij@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=nsaenz@kernel.org \
--cc=p.zabel@pengutronix.de \
--cc=patches@armlinux.org.uk \
--cc=robh@kernel.org \
--cc=saravanak@google.com \
--cc=sudeep.holla@arm.com \
--cc=ulf.hansson@linaro.org \
--cc=wangkefeng.wang@huawei.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).