diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b0f4d98036cd..005b92e6585e 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5932,6 +5932,7 @@ int pcie_set_readrq(struct pci_dev *dev, int rq) { u16 v; int ret; + unsigned int firstbit; struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus); if (rq < 128 || rq > 4096 || !is_power_of_2(rq)) @@ -5949,7 +5950,10 @@ int pcie_set_readrq(struct pci_dev *dev, int rq) rq = mps; } - v = FIELD_PREP(PCI_EXP_DEVCTL_READRQ, ffs(rq) - 8); + firstbit = ffs(rq); + if (firstbit < 8) + return -EINVAL; + v = FIELD_PREP(PCI_EXP_DEVCTL_READRQ, firstbit - 8); if (bridge->no_inc_mrrs) { int max_mrrs = pcie_get_readrq(dev); |