stmmac: dwmac-ipq806x: fix static checker warning

The patch b1c17215d718: "stmmac: add ipq806x glue layer", leads to the
following static checker warning:

.../stmmac/dwmac-ipq806x.c:314 ipq806x_gmac_probe()
warn: double left shift '1 << (1 << gmac->id)'

The NSS_COMMON_CLK_SRC_CTRL_OFFSET macro is used once as an offset, and
once as a mask, which is a bug indeed. We'll fix it by defining the
offset as the real offset value and computing the mask from it when
required.

Tested on IPQ806x ref designs AP148 & DB149.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
index 7e3129e..f0e4bb4 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -42,7 +42,7 @@
 #define NSS_COMMON_CLK_DIV_MASK                        0x7f
 
 #define NSS_COMMON_CLK_SRC_CTRL                        0x14
-#define NSS_COMMON_CLK_SRC_CTRL_OFFSET(x)      (1 << x)
+#define NSS_COMMON_CLK_SRC_CTRL_OFFSET(x)      (x)
 /* Mode is coded on 1 bit but is different depending on the MAC ID:
  * MAC0: QSGMII=0 RGMII=1
  * MAC1: QSGMII=0 SGMII=0 RGMII=1
@@ -291,7 +291,7 @@ static void *ipq806x_gmac_setup(struct platform_device *pdev)
 
        /* Configure the clock src according to the mode */
        regmap_read(gmac->nss_common, NSS_COMMON_CLK_SRC_CTRL, &val);
-       val &= ~NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id);
+       val &= ~(1 << NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id));
        switch (gmac->phy_mode) {
        case PHY_INTERFACE_MODE_RGMII:
                val |= NSS_COMMON_CLK_SRC_CTRL_RGMII(gmac->id) <<