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linux/drivers/pci/controller
History
Johan Hovold 98bd0b4ad5 PCI: vmd: Fix potential deadlock when enabling ASPM 
commit 49de0dc879 upstream.

The vmd_pm_enable_quirk() helper is called from pci_walk_bus() during
probe to enable ASPM for controllers with VMD_FEAT_BIOS_PM_QUIRK set.

Since pci_walk_bus() already holds a pci_bus_sem read lock, use
pci_enable_link_state_locked() to enable link states in order to avoid a
potential deadlock (e.g. in case someone takes a write lock before
reacquiring the read lock).

Fixes: f492edb40b ("PCI: vmd: Add quirk to configure PCIe ASPM and LTR")
Link: https://lore.kernel.org/r/20231128081512.19387-3-johan+linaro@kernel.org
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
[bhelgaas: add "potential" in subject since the deadlock has only been
reported by lockdep, include helper name in commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: <stable@vger.kernel.org>	# 6.3
Cc: Michael Bottini <michael.a.bottini@linux.intel.com>
Cc: David E. Box <david.e.box@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-12-20 17:01:54 +01:00
..
cadence PCI: Fix typos in docs and comments 2023-08-25 08:15:38 -05:00
dwc PCI: exynos: Don't discard .remove() callback 2023-11-28 17:20:01 +00:00
mobiveil PCI: Explicitly include correct DT includes 2023-07-18 14:33:17 -05:00
Kconfig pci-v6.6-changes 2023-08-30 20:23:07 -07:00
Makefile Merge branch 'pci/host/mt7621' 2021-11-05 11:28:51 -05:00
pci-aardvark.c PCI: aardvark: Convert to platform remove callback returning void 2023-06-24 14:10:09 +00:00
pci-ftpci100.c PCI: Explicitly include correct DT includes 2023-07-18 14:33:17 -05:00
pci-host-common.c PCI: Explicitly include correct DT includes 2023-07-18 14:33:17 -05:00
pci-host-generic.c PCI: Unify ECAM constants in native PCI Express drivers 2020-12-10 14:55:49 -06:00
pci-hyperv-intf.c PCI: hv: Add a Hyper-V PCI interface driver for software backchannel interface 2019-08-22 00:25:12 -07:00
pci-hyperv.c PCI: hv: Fix a crash in hv_pci_restore_msi_msg() during hibernation 2023-08-22 15:03:11 +02:00
pci-ixp4xx.c PCI: Explicitly include correct DT includes 2023-07-18 14:33:17 -05:00
pci-loongson.c PCI: loongson: Limit MRRS to 256 2023-12-20 17:01:53 +01:00
pci-mvebu.c PCI: mvebu: Use FIELD_PREP() with Link Width 2023-11-28 17:19:43 +00:00
pci-rcar-gen2.c PCI: rcar-gen2: Use devm_platform_get_and_ioremap_resource() 2023-07-13 18:12:35 +00:00
pci-tegra.c PCI: tegra: Convert to platform remove callback returning void 2023-06-24 14:14:02 +00:00
pci-thunder-ecam.c PCI: thunder: Drop error data fabrication when config read fails 2021-11-18 13:39:32 -06:00
pci-thunder-pem.c PCI: thunder: Drop error data fabrication when config read fails 2021-11-18 13:39:32 -06:00
pci-v3-semi.c Merge branch 'pci/misc' 2023-08-29 11:03:57 -05:00
pci-versatile.c PCI: Remove MODULE_LICENSE so boolean drivers don't look like modules 2023-02-17 08:47:58 -06:00
pci-xgene-msi.c PCI: xgene-msi: Use devm_platform_get_and_ioremap_resource() 2023-07-13 18:12:36 +00:00
pci-xgene.c PCI: Remove unnecessary <linux/of_irq.h> includes 2022-11-10 14:53:51 -06:00
pcie-altera-msi.c PCI: altera-msi: Convert to platform remove callback returning void 2023-06-24 14:10:47 +00:00
pcie-altera.c PCI: Explicitly include correct DT includes 2023-07-18 14:33:17 -05:00
pcie-apple.c Merge branch 'pci/misc' 2023-08-29 11:03:57 -05:00
pcie-brcmstb.c PCI: brcmstb: Remove stale comment 2023-08-24 17:33:59 +02:00
pcie-hisi-error.c PCI: hisi-error: Convert to platform remove callback returning void 2023-06-24 14:12:13 +00:00
pcie-iproc-bcma.c PCI: Add defines for normal and subtractive PCI bridges 2022-02-17 15:29:35 -06:00
pcie-iproc-msi.c PCI: iproc: Use of_property_read_bool() for boolean properties 2023-07-13 18:09:24 +00:00
pcie-iproc-platform.c PCI: iproc: Convert to platform remove callback returning void 2023-06-24 14:12:36 +00:00
pcie-iproc.c PCI: iproc: Convert to platform remove callback returning void 2023-06-24 14:12:36 +00:00
pcie-iproc.h PCI: iproc: Convert to platform remove callback returning void 2023-06-24 14:12:36 +00:00
pcie-mediatek-gen3.c PCI: mediatek-gen3: Convert to platform remove callback returning void 2023-06-24 14:13:02 +00:00
pcie-mediatek.c PCI: mediatek: Convert to platform remove callback returning void 2023-06-24 14:12:47 +00:00
pcie-microchip-host.c Merge branch 'pci/controller/remove-void-cast' 2023-08-29 11:03:56 -05:00
pcie-mt7621.c PCI: mt7621: Convert to platform remove callback returning void 2023-06-24 14:13:16 +00:00
pcie-rcar-ep.c PCI: rcar-ep: Remove unneeded includes 2021-10-08 09:41:38 -05:00
pcie-rcar-host.c PCI: rcar: Use correct product family name for Renesas R-Car 2023-06-24 13:15:51 +00:00
pcie-rcar.c PCI: rcar: Fix calculating mask for PCIEPAMR register 2020-05-11 11:29:48 +01:00
pcie-rcar.h PCI: rcar: Avoid defines prefixed with CONFIG 2023-03-10 13:34:27 +01:00
pcie-rockchip-ep.c PCI: rockchip: Set address alignment for endpoint mode 2023-06-22 09:36:51 +02:00
pcie-rockchip-host.c PCI: Explicitly include correct DT includes 2023-07-18 14:33:17 -05:00
pcie-rockchip.c PCI: Explicitly include correct DT includes 2023-07-18 14:33:17 -05:00
pcie-rockchip.h PCI: rockchip: Use 64-bit mask on MSI 64-bit PCI address 2023-07-13 18:25:44 +00:00
pcie-xilinx-cpm.c PCI: Remove unnecessary <linux/of_irq.h> includes 2022-11-10 14:53:51 -06:00
pcie-xilinx-nwl.c Merge branch 'pci/kbuild' 2022-12-10 10:36:52 -06:00
pcie-xilinx.c PCI: xilinx: Rename xilinx_pcie_port to xilinx_pcie 2022-01-03 15:05:28 -06:00
vmd.c PCI: vmd: Fix potential deadlock when enabling ASPM 2023-12-20 17:01:54 +01:00