If a driver asks for more MSIs than the devices "req#msi(-x)" property,
we currently return -ENOSPC. This doesn't give the driver any chance to
make a new request with a number that might work.
So if "req#msi(-x)" is less than the request, return its value. To be
100% safe, make sure we return an error if req_msi == 0.
Signed-off-by: Michael Ellerman <mich...@ellerman.id.au>
---
arch/powerpc/platforms/pseries/msi.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/msi.c
b/arch/powerpc/platforms/pseries/msi.c
index b42dfa6..e56ae42 100644
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -154,7 +154,11 @@ static int check_req(struct pci_dev *pdev, int nvec, char
*prop_name)
if (*req_msi < nvec) {
pr_debug("rtas_msi: %s requests < %d MSIs\n", prop_name, nvec);
- return -ENOSPC;
+
+ if (*req_msi == 0) /* Be paranoid */
+ return -ENOSPC;
+
+ return *req_msi;
}
return 0;
--
1.5.6.3
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