[PATCH v5] net: phy: micrel: Fix regression in kszphy_probe

From: Niklas Cassel
Date: Tue May 12 2015 - 03:43:30 EST

Don't do clock-mode-select if clk == NULL,
since when building without CONFIG_HAVE_CLK,
clk_get returns NULL and clk_get_rate returns 0.

Doing clock-mode-select in this cause causes kszphy_probe to
return -EINVAL and thus prevents the device from being probed.

The original code (before regression) would return 0
when building without CONFIG_HAVE_CLK.

Cc: stable <stable@xxxxxxxxxxxxxxx> # 3.18+
Fixes: 1fadee0c3645 ("net/phy: micrel: Add clock support for
Reviewed-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
Reviewed-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Niklas Cassel <niklass@xxxxxxxx>
drivers/net/phy/micrel.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 1190fd8..ebdc357 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -548,7 +548,8 @@ static int kszphy_probe(struct phy_device *phydev)

clk = devm_clk_get(&phydev->dev, "rmii-ref");
- if (!IS_ERR(clk)) {
+ /* NOTE: clk may be NULL if building without CONFIG_HAVE_CLK */
+ if (!IS_ERR_OR_NULL(clk)) {
unsigned long rate = clk_get_rate(clk);
bool rmii_ref_clk_sel_25_mhz;


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