net: fec: Fix reference count leak in fec series ops

pm_runtime_get_sync() will increment pm usage at first and it will
resume the device later. If runtime of the device has error or
device is in inaccessible state(or other error state), resume
operation will fail. If we do not call put operation to decrease
the reference, it will result in reference count leak. Moreover,
this device cannot enter the idle state and always stay busy or other
non-idle state later. So we fixed it by replacing it with
pm_runtime_resume_and_get.

Fixes: 8fff755e9f8d0 ("net: fec: Ensure clocks are enabled while using mdio bus")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index d7919555250dd34fcf372c85dd1c03aa13d76d03..04f24c66cf3668113014208d8a2dedc76180f131 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1808,7 +1808,7 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
        int ret = 0, frame_start, frame_addr, frame_op;
        bool is_c45 = !!(regnum & MII_ADDR_C45);
 
-       ret = pm_runtime_get_sync(dev);
+       ret = pm_runtime_resume_and_get(dev);
        if (ret < 0)
                return ret;
 
@@ -1867,11 +1867,9 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
        int ret, frame_start, frame_addr;
        bool is_c45 = !!(regnum & MII_ADDR_C45);
 
-       ret = pm_runtime_get_sync(dev);
+       ret = pm_runtime_resume_and_get(dev);
        if (ret < 0)
                return ret;
-       else
-               ret = 0;
 
        if (is_c45) {
                frame_start = FEC_MMFR_ST_C45;
@@ -2275,7 +2273,7 @@ static void fec_enet_get_regs(struct net_device *ndev,
        u32 i, off;
        int ret;
 
-       ret = pm_runtime_get_sync(dev);
+       ret = pm_runtime_resume_and_get(dev);
        if (ret < 0)
                return;
 
@@ -2976,7 +2974,7 @@ fec_enet_open(struct net_device *ndev)
        int ret;
        bool reset_again;
 
-       ret = pm_runtime_get_sync(&fep->pdev->dev);
+       ret = pm_runtime_resume_and_get(&fep->pdev->dev);
        if (ret < 0)
                return ret;
 
@@ -3770,7 +3768,7 @@ fec_drv_remove(struct platform_device *pdev)
        struct device_node *np = pdev->dev.of_node;
        int ret;
 
-       ret = pm_runtime_get_sync(&pdev->dev);
+       ret = pm_runtime_resume_and_get(&pdev->dev);
        if (ret < 0)
                return ret;