Commit d523cc37 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
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powerpc/pseries: Return req#msi(-x) if request is larger

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: default avatarMichael Ellerman <>
Signed-off-by: default avatarBenjamin Herrenschmidt <>
parent 620165f9
......@@ -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;
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