diff mbox series

Avoid setting odd BAR if skipping reserved 64bit BAR

Message ID 1556208665-1954-1-git-send-email-amikhak@wirelessfabric.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show
Series Avoid setting odd BAR if skipping reserved 64bit BAR | expand

Commit Message

Alan Mikhak April 25, 2019, 4:11 p.m. UTC 
From: Alan Mikhak <amikhak@wirelessfabric.com>

Check 64bit flag before skipping reserved BARs
in pci_epf_test_set_bar(). Otherwise it will call
pci_epc_set_bar() on odd loop index when skipping
reserved 64bit BAR.

Signed-off-by: Alan Mikhak <amikhak@wirelessfabric.com>
---
 drivers/pci/endpoint/functions/pci-epf-test.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index d0b91da..64d5a57 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -389,7 +389,7 @@  static void pci_epf_test_unbind(struct pci_epf *epf)
 
 static int pci_epf_test_set_bar(struct pci_epf *epf)
 {
-	int bar;
+	int bar, add;
 	int ret;
 	struct pci_epf_bar *epf_bar;
 	struct pci_epc *epc = epf->epc;
@@ -400,8 +400,14 @@  static int pci_epf_test_set_bar(struct pci_epf *epf)
 
 	epc_features = epf_test->epc_features;
 
-	for (bar = BAR_0; bar <= BAR_5; bar++) {
+	for (bar = BAR_0; bar <= BAR_5; bar += add) {
 		epf_bar = &epf->bar[bar];
+		/*
+		 * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
+		 * if the specific implementation required a 64-bit BAR,
+		 * even if we only requested a 32-bit BAR.
+		 */
+		add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
 
 		if (!!(epc_features->reserved_bar & (1 << bar)))
 			continue;
@@ -413,13 +419,6 @@  static int pci_epf_test_set_bar(struct pci_epf *epf)
 			if (bar == test_reg_bar)
 				return ret;
 		}
-		/*
-		 * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
-		 * if the specific implementation required a 64-bit BAR,
-		 * even if we only requested a 32-bit BAR.
-		 */
-		if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
-			bar++;
 	}
 
 	return 0;