powerpc/pseries: Return the number of MSIs we could allocate

If we can't allocate the requested number of MSIs, we can still tell the
generic code how many we were able to allocate. That can then be passed
onto the driver, allowing it to request that many in future, and
probably succeeed.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index e6c80ac076974e491264a51b2c33dc3d6ff5188d..073b518338a3f601189109a7b2e597318cd1fa85 100644 (file)
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -71,11 +71,13 @@ static int rtas_change_msi(struct pci_dn *pdn, u32 func, u32 num_irqs)
        } while (rtas_busy_delay(rc));
 
        /*
-        * If the RTAS call succeeded, check the number of irqs is actually
-        * what we asked for. If not, return an error.
+        * If the RTAS call succeeded, return the number of irqs allocated.
+        * If not, make sure we return a negative error code.
         */
-       if (rc == 0 && rtas_ret[0] != num_irqs)
-               rc = -ENOSPC;
+       if (rc == 0)
+               rc = rtas_ret[0];
+       else if (rc > 0)
+               rc = -rc;
 
        pr_debug("rtas_msi: ibm,change_msi(func=%d,num=%d), got %d rc = %d\n",
                 func, num_irqs, rtas_ret[0], rc);
@@ -91,7 +93,7 @@ static void rtas_disable_msi(struct pci_dev *pdev)
        if (!pdn)
                return;
 
-       if (rtas_change_msi(pdn, RTAS_CHANGE_FN, 0))
+       if (rtas_change_msi(pdn, RTAS_CHANGE_FN, 0) != 0)
                pr_debug("rtas_msi: Setting MSIs to 0 failed!\n");
 }
 
@@ -195,14 +197,14 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
        if (type == PCI_CAP_ID_MSI) {
                rc = rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, nvec);
 
-               if (rc) {
+               if (rc < 0) {
                        pr_debug("rtas_msi: trying the old firmware call.\n");
                        rc = rtas_change_msi(pdn, RTAS_CHANGE_FN, nvec);
                }
        } else
                rc = rtas_change_msi(pdn, RTAS_CHANGE_MSIX_FN, nvec);
 
-       if (rc) {
+       if (rc != nvec) {
                pr_debug("rtas_msi: rtas_change_msi() failed\n");
                return rc;
        }