From: Bjorn Helgaas <helgaas@kernel.org>
To: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Cc: "Bjorn Helgaas" <bhelgaas@google.com>,
linux-pci@vger.kernel.org,
"Rick Wertenbroek" <rick.wertenbroek@gmail.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Manivannan Sadhasivam" <mani@kernel.org>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v4 16/17] misc: pci_endpoint_test: Do not write status in IRQ handler
Date: Fri, 14 Apr 2023 11:18:43 -0500 [thread overview]
Message-ID: <20230414161843.GA198740@bhelgaas> (raw)
In-Reply-To: <20230330085357.2653599-17-damien.lemoal@opensource.wdc.com>
On Thu, Mar 30, 2023 at 05:53:56PM +0900, Damien Le Moal wrote:
> pci_endpoint_test_irqhandler() always rewrites the status register when
> an IRQ is raised, either as-is if STATUS_IRQ_RAISED is not set, or with
> STATUS_IRQ_RAISED cleared if that flag is set. The first case creates a
> race window with the endpoint side, meaning that the host side test
> driver may end up reading what it just wrote, thus loosing the real
> status as set by the endpoint side before raising the next interrupt.
> This can prevent detecting that the STATUS_IRQ_RAISED flag was set by
> the endpoint.
s/loosing/losing/
next prev parent reply other threads:[~2023-04-14 16:18 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-30 8:53 [PATCH v4 00/17] PCI endpoint fixes and improvements Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 01/17] PCI: endpoint: Automatically create a function specific attributes group Damien Le Moal
2023-03-31 5:22 ` Manivannan Sadhasivam
2023-03-31 7:16 ` Damien Le Moal
2023-04-14 15:58 ` Bjorn Helgaas
2023-04-15 0:55 ` Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 02/17] PCI: endpoint: Move pci_epf_type_add_cfs() code Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 03/17] PCI: epf-test: Fix DMA transfer completion initialization Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 04/17] PCI: epf-test: Fix DMA transfer completion detection Damien Le Moal
2023-03-31 5:25 ` Manivannan Sadhasivam
2023-04-04 9:47 ` Shunsuke Mie
2023-04-04 10:16 ` Damien Le Moal
2023-04-04 10:30 ` Shunsuke Mie
2023-04-13 1:50 ` Damien Le Moal
2023-04-14 15:41 ` Bjorn Helgaas
2023-04-14 15:45 ` Bjorn Helgaas
2023-04-14 16:00 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 05/17] PCI: epf-test: Use dmaengine_submit() to initiate DMA transfer Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 06/17] PCI: epf-test: Simplify read/write/copy test functions Damien Le Moal
2023-04-14 16:06 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 07/17] PCI: epf-test: Simplify pci_epf_test_raise_irq() Damien Le Moal
2023-04-14 16:08 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 08/17] PCI: epf-test: Simplify IRQ test commands execution Damien Le Moal
2023-04-14 16:09 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 09/17] PCI: epf-test: Improve handling of command and status registers Damien Le Moal
2023-04-14 16:11 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 10/17] PCI: epf-test: Cleanup pci_epf_test_cmd_handler() Damien Le Moal
2023-04-14 16:12 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 11/17] PCI: epf-test: Cleanup request result handling Damien Le Moal
2023-03-31 5:28 ` Manivannan Sadhasivam
2023-03-30 8:53 ` [PATCH v4 12/17] PCI: epf-test: Simplify DMA support checks Damien Le Moal
2023-04-14 16:14 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 13/17] PCI: epf-test: Simplify transfers result print Damien Le Moal
2023-04-14 16:17 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 14/17] misc: pci_endpoint_test: Free IRQs before removing the device Damien Le Moal
2023-04-14 16:17 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 15/17] misc: pci_endpoint_test: Re-init completion for every test Damien Le Moal
2023-03-31 5:29 ` Manivannan Sadhasivam
2023-03-30 8:53 ` [PATCH v4 16/17] misc: pci_endpoint_test: Do not write status in IRQ handler Damien Le Moal
2023-04-14 16:18 ` Bjorn Helgaas [this message]
2023-03-30 8:53 ` [PATCH v4 17/17] misc: pci_endpoint_test: Simplify pci_endpoint_test_msi_irq() Damien Le Moal
2023-04-14 16:19 ` Bjorn Helgaas
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