MSI: Replace pci_msi_quirk with calls to pci_no_msi()

I don't see any reason why we need pci_msi_quirk, quirk code can just
call pci_no_msi() instead.

Remove the check of pci_msi_quirk in msi_init(). This is safe as all
calls to msi_init() are protected by calls to pci_msi_supported(),
which checks pci_msi_enable, which is disabled by pci_no_msi().

The pci_disable_msi routines didn't check pci_msi_quirk, only
pci_msi_enable, but as far as I can see that was a bug not a feature.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 4 insertions, 19 deletions

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index ee7b75b976b5..0420697c4293 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -5954,8 +5954,7 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
          * responding after a while.
          *
          * AMD believes this incompatibility is unique to the 5706, and
-         * prefers to locally disable MSI rather than globally disabling it
-         * using pci_msi_quirk.
+         * prefers to locally disable MSI rather than globally disabling it.
          */
         if (CHIP_NUM(bp) == CHIP_NUM_5706 && disable_msi == 0) {
                 struct pci_dev *amd_8132 = NULL;
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index e87e8efb9bb4..3776531586d1 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -170,13 +170,6 @@ static int msi_init(void)
         if (!status)
                 return status;
 
-        if (pci_msi_quirk) {
-                pci_msi_enable = 0;
-                printk(KERN_WARNING "PCI: MSI quirk detected. MSI disabled.\n");
-                status = -EINVAL;
-                return status;
-        }
-
         status = msi_cache_init();
         if (status < 0) {
                 pci_msi_enable = 0;
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 783e81f81f58..4948db0f8100 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -43,12 +43,8 @@ extern void pci_remove_legacy_files(struct pci_bus *bus);
 /* Lock for read/write access to pci device and bus lists */
 extern struct rw_semaphore pci_bus_sem;
 
-#ifdef CONFIG_PCI_MSI
-extern int pci_msi_quirk;
-#else
-#define pci_msi_quirk 0
-#endif
 extern unsigned int pci_pm_d3_delay;
+
 #ifdef CONFIG_PCI_MSI
 void disable_msi_mode(struct pci_dev *dev, int pos, int type);
 void pci_no_msi(void);
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index d0c359335077..0d0ba2fad5fc 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1700,9 +1700,6 @@ DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_NVIDIA,  PCI_DEVICE_ID_NVIDIA_CK804_PCIE,
                         quirk_nvidia_ck804_pcie_aer_ext_cap);
 
 #ifdef CONFIG_PCI_MSI
-/* To disable MSI globally */
-int pci_msi_quirk;
-
 /* The Serverworks PCI-X chipset does not support MSI. We cannot easily rely
  * on setting PCI_BUS_FLAGS_NO_MSI in its bus flags because there are actually
  * some other busses controlled by the chipset even if Linux is not aware of it.
@@ -1711,8 +1708,8 @@ int pci_msi_quirk;
  */
 static void __init quirk_svw_msi(struct pci_dev *dev)
 {
-        pci_msi_quirk = 1;
-        printk(KERN_WARNING "PCI: MSI quirk detected. pci_msi_quirk set.\n");
+        pci_no_msi();
+        printk(KERN_WARNING "PCI: MSI quirk detected. MSI deactivated.\n");
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_GCNB_LE, quirk_svw_msi);