| Message ID | 171659995361.845588.6664390911348526329.stgit@dwillia2-xfh.jf.intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: Fix missing lockdep annotation for pci_cfg_access_trylock() | expand |
On 5/24/24 6:19 PM, Dan Williams wrote: > Alex reports a new vfio-pci lockdep warning resulting from the > cfg_access_lock lock_map added recently. > > Add the missing annotation to pci_cfg_access_trylock() and adjust the > lock_map acquisition to be symmetrical relative to pci_lock. > > Fixes: 7e89efc6e9e4 ("PCI: Lock upstream bridge for pci_reset_function()") > Reported-by: Alex Williamson <alex.williamson@redhat.com> > Closes: http://lore.kernel.org/r/20240523131005.5578e3de.alex.williamson@redhat.com > Tested-by: Alex Williamson <alex.williamson@redhat.com> > Cc: Dave Jiang <dave.jiang@intel.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> > --- > drivers/pci/access.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/drivers/pci/access.c b/drivers/pci/access.c > index 30f031de9cfe..3595130ff719 100644 > --- a/drivers/pci/access.c > +++ b/drivers/pci/access.c > @@ -289,11 +289,10 @@ void pci_cfg_access_lock(struct pci_dev *dev) > { > might_sleep(); > > - lock_map_acquire(&dev->cfg_access_lock); > - > raw_spin_lock_irq(&pci_lock); > if (dev->block_cfg_access) > pci_wait_cfg(dev); > + lock_map_acquire(&dev->cfg_access_lock); > dev->block_cfg_access = 1; > raw_spin_unlock_irq(&pci_lock); > } > @@ -315,8 +314,10 @@ bool pci_cfg_access_trylock(struct pci_dev *dev) > raw_spin_lock_irqsave(&pci_lock, flags); > if (dev->block_cfg_access) > locked = false; > - else > + else { > + lock_map_acquire(&dev->cfg_access_lock); > dev->block_cfg_access = 1; > + } > raw_spin_unlock_irqrestore(&pci_lock, flags); > > return locked; > @@ -342,11 +343,10 @@ void pci_cfg_access_unlock(struct pci_dev *dev) > WARN_ON(!dev->block_cfg_access); > > dev->block_cfg_access = 0; > + lock_map_release(&dev->cfg_access_lock); > raw_spin_unlock_irqrestore(&pci_lock, flags); > > wake_up_all(&pci_cfg_wait); > - > - lock_map_release(&dev->cfg_access_lock); > } > EXPORT_SYMBOL_GPL(pci_cfg_access_unlock); > >
On Fri, May 24, 2024 at 06:19:13PM -0700, Dan Williams wrote: > Alex reports a new vfio-pci lockdep warning resulting from the > cfg_access_lock lock_map added recently. > > Add the missing annotation to pci_cfg_access_trylock() and adjust the > lock_map acquisition to be symmetrical relative to pci_lock. > > Fixes: 7e89efc6e9e4 ("PCI: Lock upstream bridge for pci_reset_function()") > Reported-by: Alex Williamson <alex.williamson@redhat.com> > Closes: http://lore.kernel.org/r/20240523131005.5578e3de.alex.williamson@redhat.com > Tested-by: Alex Williamson <alex.williamson@redhat.com> > Cc: Dave Jiang <dave.jiang@intel.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Signed-off-by: Dan Williams <dan.j.williams@intel.com> Applied with Dave's Reviewed-by to for-linus for v6.10, thanks! > --- > drivers/pci/access.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/drivers/pci/access.c b/drivers/pci/access.c > index 30f031de9cfe..3595130ff719 100644 > --- a/drivers/pci/access.c > +++ b/drivers/pci/access.c > @@ -289,11 +289,10 @@ void pci_cfg_access_lock(struct pci_dev *dev) > { > might_sleep(); > > - lock_map_acquire(&dev->cfg_access_lock); > - > raw_spin_lock_irq(&pci_lock); > if (dev->block_cfg_access) > pci_wait_cfg(dev); > + lock_map_acquire(&dev->cfg_access_lock); > dev->block_cfg_access = 1; > raw_spin_unlock_irq(&pci_lock); > } > @@ -315,8 +314,10 @@ bool pci_cfg_access_trylock(struct pci_dev *dev) > raw_spin_lock_irqsave(&pci_lock, flags); > if (dev->block_cfg_access) > locked = false; > - else > + else { > + lock_map_acquire(&dev->cfg_access_lock); > dev->block_cfg_access = 1; > + } > raw_spin_unlock_irqrestore(&pci_lock, flags); > > return locked; > @@ -342,11 +343,10 @@ void pci_cfg_access_unlock(struct pci_dev *dev) > WARN_ON(!dev->block_cfg_access); > > dev->block_cfg_access = 0; > + lock_map_release(&dev->cfg_access_lock); > raw_spin_unlock_irqrestore(&pci_lock, flags); > > wake_up_all(&pci_cfg_wait); > - > - lock_map_release(&dev->cfg_access_lock); > } > EXPORT_SYMBOL_GPL(pci_cfg_access_unlock); > >
diff --git a/drivers/pci/access.c b/drivers/pci/access.c index 30f031de9cfe..3595130ff719 100644 --- a/drivers/pci/access.c +++ b/drivers/pci/access.c @@ -289,11 +289,10 @@ void pci_cfg_access_lock(struct pci_dev *dev) { might_sleep(); - lock_map_acquire(&dev->cfg_access_lock); - raw_spin_lock_irq(&pci_lock); if (dev->block_cfg_access) pci_wait_cfg(dev); + lock_map_acquire(&dev->cfg_access_lock); dev->block_cfg_access = 1; raw_spin_unlock_irq(&pci_lock); } @@ -315,8 +314,10 @@ bool pci_cfg_access_trylock(struct pci_dev *dev) raw_spin_lock_irqsave(&pci_lock, flags); if (dev->block_cfg_access) locked = false; - else + else { + lock_map_acquire(&dev->cfg_access_lock); dev->block_cfg_access = 1; + } raw_spin_unlock_irqrestore(&pci_lock, flags); return locked; @@ -342,11 +343,10 @@ void pci_cfg_access_unlock(struct pci_dev *dev) WARN_ON(!dev->block_cfg_access); dev->block_cfg_access = 0; + lock_map_release(&dev->cfg_access_lock); raw_spin_unlock_irqrestore(&pci_lock, flags); wake_up_all(&pci_cfg_wait); - - lock_map_release(&dev->cfg_access_lock); } EXPORT_SYMBOL_GPL(pci_cfg_access_unlock);
Alex reports a new vfio-pci lockdep warning resulting from the cfg_access_lock lock_map added recently. Add the missing annotation to pci_cfg_access_trylock() and adjust the lock_map acquisition to be symmetrical relative to pci_lock. Fixes: 7e89efc6e9e4 ("PCI: Lock upstream bridge for pci_reset_function()") Reported-by: Alex Williamson <alex.williamson@redhat.com> Closes: http://lore.kernel.org/r/20240523131005.5578e3de.alex.williamson@redhat.com Tested-by: Alex Williamson <alex.williamson@redhat.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- drivers/pci/access.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)