From: Yijing Wang Date: Thu, 10 Oct 2013 12:58:11 +0000 (+0800) Subject: PCI: Fail MSI/MSI-X initialization if device is not in PCI_D0 X-Git-Tag: next-20131105~77^2^2~3 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=869a16157d1ac92a61770be0bc1cf83fbe99d724;p=karo-tx-linux.git PCI: Fail MSI/MSI-X initialization if device is not in PCI_D0 Currently, pci_enable_msi() and pci_enable_msix() return success even if the device power state is not D0. However, we don't write the MSI message to the device registers, and the registers will never be updated later. This patch makes pci_enable_msi() and pci_enable_msix() return an error instead. [bhelgaas: changelog] Signed-off-by: Yijing Wang Acked-by: Ben Hutchings Signed-off-by: Bjorn Helgaas --- diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index d5f90d6383bc..604265c40853 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -831,7 +831,7 @@ int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec) int status, maxvec; u16 msgctl; - if (!dev->msi_cap) + if (!dev->msi_cap || dev->current_state != PCI_D0) return -EINVAL; pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl); @@ -862,7 +862,7 @@ int pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *maxvec) int ret, nvec; u16 msgctl; - if (!dev->msi_cap) + if (!dev->msi_cap || dev->current_state != PCI_D0) return -EINVAL; pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl); @@ -955,7 +955,7 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec) int status, nr_entries; int i, j; - if (!entries || !dev->msix_cap) + if (!entries || !dev->msix_cap || dev->current_state != PCI_D0) return -EINVAL; status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX);