All of lore.kernel.org
 help / color / mirror / Atom feed
From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: yajun.deng@linux.dev
Cc: catalin.marinas@arm.com, will@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH linux-next v2] arm64: PCI: Introduce pcibios_free_irq() helper function
Date: Wed, 22 Sep 2021 17:22:01 +0100	[thread overview]
Message-ID: <20210922162201.GA24429@lpieralisi> (raw)
In-Reply-To: <b821ee0489f71a90a74c1d905c4fa530@linux.dev>

On Wed, Sep 22, 2021 at 02:49:13AM +0000, yajun.deng@linux.dev wrote:
> September 21, 2021 11:47 PM, "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com> wrote:
> 
> > On Thu, Aug 26, 2021 at 02:04:06PM +0800, Yajun Deng wrote:
> > 
> >> pcibios_alloc_irq() will be called in pci_device_probe(), but there
> >> hasn't pcibios_free_irq() in arm64 architecture correspond it.
> >> pcibios_free_irq() is an empty weak function in drivers/pci/pci-driver.c.
> > 
> > "pcibios_alloc_irq() is a weak function called to allocate IRQs for
> > a device in pci_device_probe(); arm64 implements it with
> > ACPI specific code to enable IRQs for a device.
> > 
> > When a device is removed (pci_device_remove()) the pcibios_free_irq()
> > counterpart is called.
> > 
> > Current arm64 code does not implement a pcibios_free_irq() function,
> > and therefore, the weak empty stub is executed, which means that the
> > IRQ for a device are not properly disabled when a device is removed.
> > 
> > Add an arm64 pcibios_free_irq() to undo the actions carried out in
> > pcibios_alloc_irq()."
> > 
> > This is a stub commit log. Then you need to describe the bug you
> > are fixing (if any, or it is just code inspection ?)
> > 
> It is just code inspection.

Before merging it it must be tested, which would prove it is needed.

Lorenzo

> >> So add pcibios_free_irq() for correspond it. This will be called
> >> in pci_device_remove().
> >> 
> >> ====================
> >> v2: remove the change in pcibios_alloc_irq(), and modify the commit log.
> >> ====================
> > 
> > Don't add versioning in the commit log, it does not belong here.
> > 
> > I don't think we should send this to stable kernels straight away,
> > it is best to make sure we are not triggering any regressions first.
> > 
> > Lorenzo
> > 
> >> Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
> >> ---
> >> arch/arm64/kernel/pci.c | 7 +++++++
> >> 1 file changed, 7 insertions(+)
> >> 
> >> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> >> index 2276689b5411..6ffd92126f65 100644
> >> --- a/arch/arm64/kernel/pci.c
> >> +++ b/arch/arm64/kernel/pci.c
> >> @@ -29,6 +29,13 @@ int pcibios_alloc_irq(struct pci_dev *dev)
> >> 
> >> return 0;
> >> }
> >> +
> >> +void pcibios_free_irq(struct pci_dev *dev)
> >> +{
> >> + if (!acpi_disabled)
> >> + acpi_pci_irq_disable(dev);
> >> +}
> >> +
> >> #endif
> >> 
> >> /*
> >> --
> >> 2.32.0

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: yajun.deng@linux.dev
Cc: catalin.marinas@arm.com, will@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH linux-next v2] arm64: PCI: Introduce pcibios_free_irq() helper function
Date: Wed, 22 Sep 2021 17:22:01 +0100	[thread overview]
Message-ID: <20210922162201.GA24429@lpieralisi> (raw)
In-Reply-To: <b821ee0489f71a90a74c1d905c4fa530@linux.dev>

On Wed, Sep 22, 2021 at 02:49:13AM +0000, yajun.deng@linux.dev wrote:
> September 21, 2021 11:47 PM, "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com> wrote:
> 
> > On Thu, Aug 26, 2021 at 02:04:06PM +0800, Yajun Deng wrote:
> > 
> >> pcibios_alloc_irq() will be called in pci_device_probe(), but there
> >> hasn't pcibios_free_irq() in arm64 architecture correspond it.
> >> pcibios_free_irq() is an empty weak function in drivers/pci/pci-driver.c.
> > 
> > "pcibios_alloc_irq() is a weak function called to allocate IRQs for
> > a device in pci_device_probe(); arm64 implements it with
> > ACPI specific code to enable IRQs for a device.
> > 
> > When a device is removed (pci_device_remove()) the pcibios_free_irq()
> > counterpart is called.
> > 
> > Current arm64 code does not implement a pcibios_free_irq() function,
> > and therefore, the weak empty stub is executed, which means that the
> > IRQ for a device are not properly disabled when a device is removed.
> > 
> > Add an arm64 pcibios_free_irq() to undo the actions carried out in
> > pcibios_alloc_irq()."
> > 
> > This is a stub commit log. Then you need to describe the bug you
> > are fixing (if any, or it is just code inspection ?)
> > 
> It is just code inspection.

Before merging it it must be tested, which would prove it is needed.

Lorenzo

> >> So add pcibios_free_irq() for correspond it. This will be called
> >> in pci_device_remove().
> >> 
> >> ====================
> >> v2: remove the change in pcibios_alloc_irq(), and modify the commit log.
> >> ====================
> > 
> > Don't add versioning in the commit log, it does not belong here.
> > 
> > I don't think we should send this to stable kernels straight away,
> > it is best to make sure we are not triggering any regressions first.
> > 
> > Lorenzo
> > 
> >> Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
> >> ---
> >> arch/arm64/kernel/pci.c | 7 +++++++
> >> 1 file changed, 7 insertions(+)
> >> 
> >> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> >> index 2276689b5411..6ffd92126f65 100644
> >> --- a/arch/arm64/kernel/pci.c
> >> +++ b/arch/arm64/kernel/pci.c
> >> @@ -29,6 +29,13 @@ int pcibios_alloc_irq(struct pci_dev *dev)
> >> 
> >> return 0;
> >> }
> >> +
> >> +void pcibios_free_irq(struct pci_dev *dev)
> >> +{
> >> + if (!acpi_disabled)
> >> + acpi_pci_irq_disable(dev);
> >> +}
> >> +
> >> #endif
> >> 
> >> /*
> >> --
> >> 2.32.0

  reply	other threads:[~2021-09-22 16:24 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26  6:04 [PATCH linux-next v2] arm64: PCI: Introduce pcibios_free_irq() helper function Yajun Deng
2021-08-26  6:04 ` Yajun Deng
2021-09-21 13:47 ` Catalin Marinas
2021-09-21 13:47   ` Catalin Marinas
2021-09-21 15:47 ` Lorenzo Pieralisi
2021-09-21 15:47   ` Lorenzo Pieralisi
2021-09-22  2:49   ` yajun.deng
2021-09-22  2:49     ` yajun.deng
2021-09-22 16:22     ` Lorenzo Pieralisi [this message]
2021-09-22 16:22       ` Lorenzo Pieralisi
2021-10-11 11:09       ` Will Deacon
2021-10-11 11:09         ` Will Deacon

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=20210922162201.GA24429@lpieralisi \
    --to=lorenzo.pieralisi@arm.com \
    --cc=catalin.marinas@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=will@kernel.org \
    --cc=yajun.deng@linux.dev \
    /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.