Hello,
> PCIe Link Retraining can alter Link Speed. pcie_retrain_link() that
> performs the Link Training is called from bwctrl and ASPM driver.
>
> While bwctrl listens for Link Bandwidth Management Status (LBMS) to
> pick up changes in Link Speed, there is a race between
> pcie_reset_lbms() clearing LBMS after the Link Training and
> pcie_bwnotif_irq() reading the Link Status register. If LBMS is already
> cleared when the irq handler reads the register, the interrupt handler
> will return early with IRQ_NONE and won't update the Link Speed.
>
> [...]
Applied to bwctrl, thank you!
[1/1] PCI: Update Link Speed after retraining
https://git.kernel.org/pci/pci/c/6ade6e81f898
Krzysztof
