From: Dejin Zheng <zhengdejin5@gmail.com>
To: Robert Richter <rric@kernel.org>
Cc: corbet@lwn.net, jarkko.nikula@linux.intel.com,
andriy.shevchenko@linux.intel.com,
mika.westerberg@linux.intel.com, bhelgaas@google.com,
wsa@kernel.org, linux-doc@vger.kernel.org,
linux-i2c@vger.kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/4] PCI: Introduce pcim_alloc_irq_vectors()
Date: Mon, 22 Feb 2021 23:14:15 +0800 [thread overview]
Message-ID: <20210222151415.GA896979@nuc8i5> (raw)
In-Reply-To: <YDONyMSHO9FDeY69@rric.localdomain>
On Mon, Feb 22, 2021 at 11:56:08AM +0100, Robert Richter wrote:
> On 20.02.21 00:46:49, Dejin Zheng wrote:
> > > On 18.02.21 23:04:55, Dejin Zheng wrote:
>
> > > > + if (!dr || !dr->enabled)
> > here checks whether the pci device is enabled.
>
> What is the purpose of this? The device "is_managed" or not.
>
The device is managed or not by check whether "dr" is NULL. And
check the "dr->enabled" is for the PCI device enable. I think it
may not make sense to apply for irq vectors when PCI device is not
enabled.
PCI device enable by call pci_enable_device() function, this function
initialize device before it's used by a driver. Ask low-level code
to enable I/O and memory. Wake up the device if it was suspended.
So I think it might be better to return to failure when it is found
the PCI device is not enabled in the pcim_alloc_irq_vectors() function.
It can facilitate developers to find problems as soon as possible.
BR,
Dejin
> -Robert
next prev parent reply other threads:[~2021-02-22 15:23 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-18 15:04 [PATCH v4 0/4] Introduce pcim_alloc_irq_vectors() Dejin Zheng
2021-02-18 15:04 ` [PATCH v4 1/4] PCI: " Dejin Zheng
2021-02-19 14:40 ` Robert Richter
2021-02-19 14:48 ` Robert Richter
2021-02-19 16:15 ` Krzysztof Wilczyński
2021-02-22 10:59 ` Robert Richter
2021-02-19 14:48 ` Andy Shevchenko
2021-02-19 15:01 ` Robert Richter
2021-02-19 16:46 ` Dejin Zheng
2021-02-22 10:56 ` Robert Richter
2021-02-22 15:14 ` Dejin Zheng [this message]
2021-02-23 8:02 ` Robert Richter
2021-02-23 14:14 ` Dejin Zheng
2021-02-25 9:33 ` Robert Richter
2021-02-26 15:22 ` Dejin Zheng
2021-02-18 15:04 ` [PATCH v4 2/4] Documentation: devres: Add pcim_alloc_irq_vectors() Dejin Zheng
2021-02-18 15:04 ` [PATCH v4 3/4] i2c: designware: Use the correct name of device-managed function Dejin Zheng
2021-02-18 15:35 ` Andy Shevchenko
2021-02-18 15:04 ` [PATCH v4 4/4] i2c: thunderx: " Dejin Zheng
2021-02-19 15:45 ` Robert Richter
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=20210222151415.GA896979@nuc8i5 \
--to=zhengdejin5@gmail.com \
--cc=andriy.shevchenko@linux.intel.com \
--cc=bhelgaas@google.com \
--cc=corbet@lwn.net \
--cc=jarkko.nikula@linux.intel.com \
--cc=linux-doc@vger.kernel.org \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=mika.westerberg@linux.intel.com \
--cc=rric@kernel.org \
--cc=wsa@kernel.org \
/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.