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authorMichael Ellerman <michael@ellerman.id.au>2009-01-22 20:54:33 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-02-11 13:38:02 +1100
commit6071ed0487c6ea8dcfadd9844b9b90944cd9de1e (patch)
tree8890252e4578bc29e079795efa2cec3c9fe35f22 /arch/powerpc/platforms/pseries/msi.c
parent649781f82782d142443d895b98edbd8be4e75c56 (diff)
downloadvexpress-lsk-6071ed0487c6ea8dcfadd9844b9b90944cd9de1e.tar.gz
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>
Diffstat (limited to 'arch/powerpc/platforms/pseries/msi.c')
-rw-r--r--arch/powerpc/platforms/pseries/msi.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index e6c80ac0769..073b518338a 100644
--- 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;
}