net: lpc_eth: fix warnings caused by enabling unprepared clock

If common clock framework is configured, the driver generates warnings,
which are fixed by this change:

    WARNING: CPU: 0 PID: 1 at linux/drivers/clk/clk.c:727 clk_core_enable+0x2c/0xa4()
    Modules linked in:
    CPU: 0 PID: 1 Comm: swapper Not tainted 4.3.0-rc2+ #141
    Hardware name: LPC32XX SoC (Flattened Device Tree)
    Backtrace:
    [<>] (dump_backtrace) from [<>] (show_stack+0x18/0x1c)
    [<>] (show_stack) from [<>] (dump_stack+0x20/0x28)
    [<>] (dump_stack) from [<>] (warn_slowpath_common+0x90/0xb8)
    [<>] (warn_slowpath_common) from [<>] (warn_slowpath_null+0x24/0x2c)
    [<>] (warn_slowpath_null) from [<>] (clk_core_enable+0x2c/0xa4)
    [<>] (clk_core_enable) from [<>] (clk_enable+0x24/0x38)
    [<>] (clk_enable) from [<>] (lpc_eth_drv_probe+0xfc/0x99c)
    [<>] (lpc_eth_drv_probe) from [<>] (platform_drv_probe+0x50/0xa0)
    [<>] (platform_drv_probe) from [<>] (driver_probe_device+0x18c/0x408)
    [<>] (driver_probe_device) from [<>] (__driver_attach+0x70/0x94)
    [<>] (__driver_attach) from [<>] (bus_for_each_dev+0x74/0x98)
    [<>] (bus_for_each_dev) from [<>] (driver_attach+0x20/0x28)
    [<>] (driver_attach) from [<>] (bus_add_driver+0x11c/0x248)
    [<>] (bus_add_driver) from [<>] (driver_register+0xa4/0xe8)
    [<>] (driver_register) from [<>] (__platform_driver_register+0x50/0x64)
    [<>] (__platform_driver_register) from [<>] (lpc_eth_driver_init+0x18/0x20)
    [<>] (lpc_eth_driver_init) from [<>] (do_one_initcall+0x11c/0x1dc)
    [<>] (do_one_initcall) from [<>] (kernel_init_freeable+0x10c/0x1d4)
    [<>] (kernel_init_freeable) from [<>] (kernel_init+0x10/0xec)
    [<>] (kernel_init) from [<>] (ret_from_fork+0x14/0x24)

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 66fd868152e5..b159ef8303cc 100644
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -476,13 +476,12 @@ static void __lpc_get_mac(struct netdata_local *pldat, u8 *mac)
         mac[5] = tmp >> 8;
 }
 
-static void __lpc_eth_clock_enable(struct netdata_local *pldat,
-                                   bool enable)
+static void __lpc_eth_clock_enable(struct netdata_local *pldat, bool enable)
 {
         if (enable)
-                clk_enable(pldat->clk);
+                clk_prepare_enable(pldat->clk);
         else
-                clk_disable(pldat->clk);
+                clk_disable_unprepare(pldat->clk);
 }
 
 static void __lpc_params_setup(struct netdata_local *pldat)
@@ -1494,7 +1493,7 @@ err_out_free_irq:
 err_out_iounmap:
         iounmap(pldat->net_base);
 err_out_disable_clocks:
-        clk_disable(pldat->clk);
+        clk_disable_unprepare(pldat->clk);
         clk_put(pldat->clk);
 err_out_free_dev:
         free_netdev(ndev);
@@ -1519,7 +1518,7 @@ static int lpc_eth_drv_remove(struct platform_device *pdev)
         iounmap(pldat->net_base);
         mdiobus_unregister(pldat->mii_bus);
         mdiobus_free(pldat->mii_bus);
-        clk_disable(pldat->clk);
+        clk_disable_unprepare(pldat->clk);
         clk_put(pldat->clk);
         free_netdev(ndev);
 
@@ -1540,7 +1539,7 @@ static int lpc_eth_drv_suspend(struct platform_device *pdev,
                 if (netif_running(ndev)) {
                         netif_device_detach(ndev);
                         __lpc_eth_shutdown(pldat);
-                        clk_disable(pldat->clk);
+                        clk_disable_unprepare(pldat->clk);
 
                         /*
                          * Reset again now clock is disable to be sure