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From: yajun.deng@linux.dev Message-ID: Subject: Re: [PATCH linux-next v2] arm64: PCI: Introduce pcibios_free_irq() helper function To: "Lorenzo Pieralisi" Cc: catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org In-Reply-To: <20210921154731.GA2756@lpieralisi> References: <20210921154731.GA2756@lpieralisi> <20210826060406.12571-1-yajun.deng@linux.dev> X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: yajun.deng@linux.dev X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210921_194917_717424_9232548D X-CRM114-Status: UNSURE ( 9.98 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org September 21, 2021 11:47 PM, "Lorenzo Pieralisi" 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. >> 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 >> --- >> 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