From d523cc379da57f1c39f5db9c47bdaa94f74727ff Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Tue, 17 Feb 2009 00:18:49 +0000 Subject: [PATCH] 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: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/platforms/pseries/msi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c index 073b518338a3..081af6d7fa02 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; -- 2.30.2