[PATCH] pci: Skip id checking if no id is passed

[Yinghai Lu]

Will get warning when pci stub driver is built-in kenel like:
pci-stub: invalid id string ""

So stop early if no id is passed.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>

---
 drivers/pci/pci-stub.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-2.6/drivers/pci/pci-stub.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci-stub.c
+++ linux-2.6/drivers/pci/pci-stub.c
@@ -47,6 +47,10 @@ static int __init pci_stub_init(void)
 	if (rc)
 		return rc;
 
+	/* no ids passed actually */
+	if (ids[0] == '\0')
+		return 0;
+
 	/* add ids specified in the module parameter */
 	p = ids;
 	while ((id = strsep(&p, ","))) {
--
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