From: "Pali Rohár" <pali@kernel.org> To: "Thomas Petazzoni" <thomas.petazzoni@bootlin.com>, "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>, "Andrew Murray" <amurray@thegoodpenguin.co.uk>, "Bjorn Helgaas" <bhelgaas@google.com>, "Marek Behún" <marek.behun@nic.cz>, "Remi Pommarel" <repk@triplefau.lt>, "Tomasz Maciej Nowak" <tmn505@gmail.com>, Xogium <contact@xogium.me> Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] PCI: aardvark: Don't touch PCIe registers if no card connected Date: Thu, 28 May 2020 16:31:41 +0200 [thread overview] Message-ID: <20200528143141.29956-1-pali@kernel.org> (raw) When there is no PCIe card connected and advk_pcie_rd_conf() or advk_pcie_wr_conf() is called for PCI bus which doesn't belong to emulated root bridge, the aardvark driver throws the following error message: advk-pcie d0070000.pcie: config read/write timed out Obviously accessing PCIe registers of disconnected card is not possible. Extend check in advk_pcie_valid_device() function for validating availability of PCIe bus. If PCIe link is down, then the device is marked as Not Found and the driver does not try to access these registers. Signed-off-by: Pali Rohár <pali@kernel.org> --- drivers/pci/controller/pci-aardvark.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 90ff291c24f0..53a4cfd7d377 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -644,6 +644,9 @@ static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus, if ((bus->number == pcie->root_bus_nr) && PCI_SLOT(devfn) != 0) return false; + if (bus->number != pcie->root_bus_nr && !advk_pcie_link_up(pcie)) + return false; + return true; } -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: "Pali Rohár" <pali@kernel.org> To: "Thomas Petazzoni" <thomas.petazzoni@bootlin.com>, "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>, "Andrew Murray" <amurray@thegoodpenguin.co.uk>, "Bjorn Helgaas" <bhelgaas@google.com>, "Marek Behún" <marek.behun@nic.cz>, "Remi Pommarel" <repk@triplefau.lt>, "Tomasz Maciej Nowak" <tmn505@gmail.com>, Xogium <contact@xogium.me> Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH] PCI: aardvark: Don't touch PCIe registers if no card connected Date: Thu, 28 May 2020 16:31:41 +0200 [thread overview] Message-ID: <20200528143141.29956-1-pali@kernel.org> (raw) When there is no PCIe card connected and advk_pcie_rd_conf() or advk_pcie_wr_conf() is called for PCI bus which doesn't belong to emulated root bridge, the aardvark driver throws the following error message: advk-pcie d0070000.pcie: config read/write timed out Obviously accessing PCIe registers of disconnected card is not possible. Extend check in advk_pcie_valid_device() function for validating availability of PCIe bus. If PCIe link is down, then the device is marked as Not Found and the driver does not try to access these registers. Signed-off-by: Pali Rohár <pali@kernel.org> --- drivers/pci/controller/pci-aardvark.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 90ff291c24f0..53a4cfd7d377 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -644,6 +644,9 @@ static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus, if ((bus->number == pcie->root_bus_nr) && PCI_SLOT(devfn) != 0) return false; + if (bus->number != pcie->root_bus_nr && !advk_pcie_link_up(pcie)) + return false; + return true; } -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2020-05-28 14:32 UTC|newest] Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-28 14:31 Pali Rohár [this message] 2020-05-28 14:31 ` [PATCH] PCI: aardvark: Don't touch PCIe registers if no card connected Pali Rohár 2020-05-28 16:26 ` Bjorn Helgaas 2020-05-28 16:26 ` Bjorn Helgaas 2020-05-28 16:38 ` Pali Rohár 2020-05-28 16:38 ` Pali Rohár 2020-05-28 16:49 ` Bjorn Helgaas 2020-05-28 16:49 ` Bjorn Helgaas 2020-05-29 8:30 ` Pali Rohár 2020-05-29 8:30 ` Pali Rohár 2020-06-30 12:31 ` Pali Rohár 2020-06-30 12:31 ` Pali Rohár 2020-06-30 13:51 ` Bjorn Helgaas 2020-06-30 13:51 ` Bjorn Helgaas 2020-06-30 14:04 ` Pali Rohár 2020-06-30 14:04 ` Pali Rohár 2020-06-30 14:58 ` Bjorn Helgaas 2020-06-30 14:58 ` Bjorn Helgaas 2020-07-01 8:08 ` Pali Rohár 2020-07-01 8:08 ` Pali Rohár 2020-07-01 8:20 ` [PATCH v2] " Pali Rohár 2020-07-01 8:20 ` Pali Rohár 2020-07-01 21:34 ` Bjorn Helgaas 2020-07-01 21:34 ` Bjorn Helgaas 2020-07-02 8:23 ` Pali Rohár 2020-07-02 8:23 ` Pali Rohár 2020-07-02 8:30 ` [PATCH v3] " Pali Rohár 2020-07-02 8:30 ` Pali Rohár 2020-07-09 11:35 ` Lorenzo Pieralisi 2020-07-09 11:35 ` Lorenzo Pieralisi 2020-07-09 12:22 ` Pali Rohár 2020-07-09 12:22 ` Pali Rohár 2020-07-09 14:47 ` Lorenzo Pieralisi 2020-07-09 14:47 ` Lorenzo Pieralisi 2020-07-09 15:09 ` Pali Rohár 2020-07-09 15:09 ` Pali Rohár 2020-07-10 9:18 ` Lorenzo Pieralisi 2020-07-10 9:18 ` Lorenzo Pieralisi 2020-07-10 15:44 ` Pali Rohár 2020-07-10 15:44 ` Pali Rohár 2020-07-10 16:08 ` Bjorn Helgaas 2020-07-10 16:08 ` Bjorn Helgaas 2020-07-10 19:30 ` Pali Rohár 2020-07-10 19:30 ` Pali Rohár 2020-07-10 20:08 ` Bjorn Helgaas 2020-07-10 20:08 ` Bjorn Helgaas 2020-07-13 8:27 ` Pali Rohár 2020-07-13 8:27 ` Pali Rohár 2020-07-13 11:23 ` Lorenzo Pieralisi 2020-07-13 11:23 ` Lorenzo Pieralisi 2020-07-13 14:50 ` Pali Rohár 2020-07-13 14:50 ` Pali Rohár 2020-07-13 16:41 ` Lorenzo Pieralisi 2020-07-13 16:41 ` Lorenzo Pieralisi 2020-07-14 7:38 ` Pali Rohár 2020-07-14 7:38 ` Pali Rohár 2020-07-15 12:17 ` Pali Rohár 2020-07-15 12:17 ` Pali Rohár 2020-07-15 16:21 ` Lorenzo Pieralisi 2020-07-15 16:21 ` Lorenzo Pieralisi 2020-07-21 8:57 ` Pali Rohár 2020-07-21 8:57 ` Pali Rohár 2020-07-21 10:48 ` Lorenzo Pieralisi 2020-07-21 10:48 ` Lorenzo Pieralisi
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