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| author | Dave Jiang <dave.jiang@intel.com> | 2024-05-02 18:57:31 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2024-05-08 20:19:20 +0200 |
| commit | 7e89efc6e9e402839643cb297bab14055c547f07 (patch) | |
| tree | a3dd3510c8f20c5458a7847af081ab5a393eedda /Documentation/admin-guide/java.rst | |
| parent | PCI/CXL: Move CXL Vendor ID to pci_ids.h (diff) | |
| download | linux-7e89efc6e9e402839643cb297bab14055c547f07.tar.xz linux-7e89efc6e9e402839643cb297bab14055c547f07.zip | |
PCI: Lock upstream bridge for pci_reset_function()
Fix a long-standing locking gap for missing pci_cfg_access_lock() while
manipulating bridge reset registers and configuration during
pci_reset_bus_function().
If there is an upstream bridge, lock it before locking the device itself.
pci_dev_lock() calls pci_cfg_access_lock(), which blocks the writing of PCI
config space by user space.
Add lockdep assertion via pci_dev->cfg_access_lock to verify
pci_dev->block_cfg_access is set.
Co-developed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/20240502165851.1948523-3-dave.jiang@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation/admin-guide/java.rst')
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