Yicong Yang eff3587b9c PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store() ... [ Upstream commit a91ee0e9fc ] The sysfs sriov_numvfs_store() path acquires the device lock before the config space access lock: sriov_numvfs_store device_lock # A (1) acquire device lock sriov_configure vfio_pci_sriov_configure # (for example) vfio_pci_core_sriov_configure pci_disable_sriov sriov_disable pci_cfg_access_lock pci_wait_cfg # B (4) wait for dev->block_cfg_access == 0 Previously, pci_dev_lock() acquired the config space access lock before the device lock: pci_dev_lock pci_cfg_access_lock dev->block_cfg_access = 1 # B (2) set dev->block_cfg_access = 1 device_lock # A (3) wait for device lock Any path that uses pci_dev_lock(), e.g., pci_reset_function(), may deadlock with sriov_numvfs_store() if the operations occur in the sequence (1) (2) (3) (4). Avoid the deadlock by reversing the order in pci_dev_lock() so it acquires the device lock before the config space access lock, the same as the sriov_numvfs_store() path. [bhelgaas: combined and adapted commit log from Jay Zhou's independent subsequent posting: https://lore.kernel.org/r/20220404062539.1710-1-jianjay.zhou@huawei.com] Link: https://lore.kernel.org/linux-pci/1583489997-17156-1-git-send-email-yangyicong@hisilicon.com/ Also-posted-by: Jay Zhou <jianjay.zhou@huawei.com> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-06-09 10:20:58 +02:00
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controller	PCI: aardvark: Fix reading MSI interrupt number	2022-05-12 12:25:46 +02:00
endpoint	PCI: endpoint: Fix misused goto label	2022-04-13 21:00:59 +02:00
hotplug	PCI: pciehp: Add Qualcomm quirk for Command Completed erratum	2022-04-13 21:00:57 +02:00
pcie	PCI/portdrv: Enable Bandwidth Notification only if port supports it	2021-09-18 13:40:10 +02:00
switch
access.c	PCI: Reduce warnings on possible RW1C corruption	2022-04-08 14:40:19 +02:00
ats.c
bus.c
ecam.c
host-bridge.c
iov.c
irq.c
Kconfig
Makefile
mmap.c
msi.c	PCI/MSI: Fix pci_irq_vector()/pci_irq_get_affinity()	2022-01-27 10:54:06 +01:00
of.c	PCI: of: Don't fail devm_pci_alloc_host_bridge() on missing 'ranges'	2021-09-22 12:28:02 +02:00
p2pdma.c	PCI/P2PDMA: Avoid pci_get_slot(), which may sleep	2021-07-20 16:05:47 +02:00
pci-acpi.c
pci-bridge-emul.c	PCI: pci-bridge-emul: Set PCI_STATUS_CAP_LIST for PCIe device	2022-01-27 10:54:26 +01:00
pci-bridge-emul.h	PCI: pci-bridge-emul: Add PCIe Root Capabilities Register	2021-09-26 14:08:55 +02:00
pci-driver.c
pci-label.c	PCI/sysfs: Fix dsm_label_utf16s_to_utf8s() buffer overrun	2021-07-20 16:05:50 +02:00
pci-mid.c
pci-pf-stub.c
pci-stub.c
pci-sysfs.c
pci.c	PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()	2022-06-09 10:20:58 +02:00
pci.h	PCI: pciehp: Ignore Link Down/Up caused by DPC	2021-07-20 16:05:47 +02:00
probe.c
proc.c
quirks.c	PCI: Avoid broken MSI on SB600 USB devices	2022-04-08 14:40:23 +02:00
remove.c
rom.c
search.c
setup-bus.c
setup-irq.c
setup-res.c
slot.c
syscall.c	PCI: Return ~0 data on pciconfig_read() CAP_SYS_ADMIN failure	2021-09-18 13:40:10 +02:00
vc.c
vpd.c
xen-pcifront.c