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* [PATCH v2] PCI: mediatek: Fix wrong operator used
@ 2020-11-03 23:10 Ryder Lee
  2020-11-04 13:10 ` Bjorn Helgaas
  0 siblings, 1 reply; 2+ messages in thread
From: Ryder Lee @ 2020-11-03 23:10 UTC (permalink / raw)
  To: Bjorn Helgaas; +Cc: linux-pci, linux-mediatek, Ryder Lee

SoCs like MT2701 and MT7623 use mtk_pcie_startup_port() to compute "func",
but from the code, the result we get is incorrect.

	#define PCI_FUNC(devfn)         ((devfn) & 0x07)

	func = PCI_FUNC(port->slot << 3)

The "func" is always 0, which results in other functions may not have been
configured correctly. (i.e. FC credits and FTS)

Addresses-Coverity-ID: 1437218 ("Wrong operator used")
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
V2 - revise commit log
---
 drivers/pci/controller/pcie-mediatek.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index cf4c18f0c25a..1980b01cee35 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -760,7 +760,7 @@ static struct pci_ops mtk_pcie_ops = {
 static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
 {
 	struct mtk_pcie *pcie = port->pcie;
-	u32 func = PCI_FUNC(port->slot << 3);
+	u32 func = PCI_FUNC(port->slot);
 	u32 slot = PCI_SLOT(port->slot << 3);
 	u32 val;
 	int err;
-- 
2.18.0

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2020-11-03 23:10 [PATCH v2] PCI: mediatek: Fix wrong operator used Ryder Lee
2020-11-04 13:10 ` Bjorn Helgaas

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