net: fec: Ensure that initialization is done prior to request_irq()

Currently request_irq() is called prior to fec_enet_init() and fec_ptp_init(),
which causes the following crash on a mx53qsb:

Unable to handle kernel NULL pointer dereference at virtual address 00000002
pgd = 80004000
[00000002] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0    Not tainted  (3.8.0-rc7-next-20130215+ #346)
PC is at fec_enet_interrupt+0xd0/0x348
LR is at fec_enet_interrupt+0xb8/0x348
pc : [<80372b7c>]    lr : [<80372b64>]    psr: 60000193
sp : df855c20  ip : df855c20  fp : df855c74
r10: 00000516  r9 : 1c000000  r8 : 00000000
r7 : 00000000  r6 : 00000000  r5 : 00000000  r4 : df9b7800
r3 : df9b7df4  r2 : 00000000  r1 : 00000000  r0 : df9b7d34

Ensure that such initialization functions are called prior to requesting the
interrupts, so that all necessary the data structures are in place when the
irqs occur.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
index 29d82cf1528e237b874b0cbbb51a37d6ce0d254e..2dbb36c985c7ec9e2370f7da05d55685e60e91d5 100644 (file)
--- a/drivers/net/ethernet/freescale/fec.c
+++ b/drivers/net/ethernet/freescale/fec.c
@@ -1782,6 +1782,15 @@ fec_probe(struct platform_device *pdev)
                fep->phy_interface = ret;
        }
 
+       fep->bufdesc_ex =
+               pdev->id_entry->driver_data & FEC_QUIRK_HAS_BUFDESC_EX;
+       if (fep->bufdesc_ex)
+               fec_ptp_init(ndev, pdev);
+
+       ret = fec_enet_init(ndev);
+       if (ret)
+               goto failed_init;
+
        for (i = 0; i < FEC_IRQ_NUM; i++) {
                irq = platform_get_irq(pdev, i);
                if (irq < 0) {
@@ -1819,8 +1828,6 @@ fec_probe(struct platform_device *pdev)
        }
 
        fep->clk_ptp = devm_clk_get(&pdev->dev, "ptp");
-       fep->bufdesc_ex =
-               pdev->id_entry->driver_data & FEC_QUIRK_HAS_BUFDESC_EX;
        if (IS_ERR(fep->clk_ptp)) {
                ret = PTR_ERR(fep->clk_ptp);
                fep->bufdesc_ex = 0;
@@ -1843,13 +1850,6 @@ fec_probe(struct platform_device *pdev)
 
        fec_reset_phy(pdev);
 
-       if (fep->bufdesc_ex)
-               fec_ptp_init(ndev, pdev);
-
-       ret = fec_enet_init(ndev);
-       if (ret)
-               goto failed_init;
-
        ret = fec_enet_mii_init(pdev);
        if (ret)
                goto failed_mii_init;
@@ -1866,7 +1866,6 @@ fec_probe(struct platform_device *pdev)
 failed_register:
        fec_enet_mii_remove(fep);
 failed_mii_init:
-failed_init:
 failed_regulator:
        clk_disable_unprepare(fep->clk_ahb);
        clk_disable_unprepare(fep->clk_ipg);
@@ -1881,6 +1880,7 @@ failed_clk:
        }
 failed_irq:
        iounmap(fep->hwp);
+failed_init:
 failed_ioremap:
        free_netdev(ndev);
 failed_alloc_etherdev:
@@ -1899,17 +1899,17 @@ fec_drv_remove(struct platform_device *pdev)
 
        unregister_netdev(ndev);
        fec_enet_mii_remove(fep);
-       for (i = 0; i < FEC_IRQ_NUM; i++) {
-               int irq = platform_get_irq(pdev, i);
-               if (irq > 0)
-                       free_irq(irq, ndev);
-       }
        del_timer_sync(&fep->time_keep);
        clk_disable_unprepare(fep->clk_ptp);
        if (fep->ptp_clock)
                ptp_clock_unregister(fep->ptp_clock);
        clk_disable_unprepare(fep->clk_ahb);
        clk_disable_unprepare(fep->clk_ipg);
+       for (i = 0; i < FEC_IRQ_NUM; i++) {
+               int irq = platform_get_irq(pdev, i);
+               if (irq > 0)
+                       free_irq(irq, ndev);
+       }
        iounmap(fep->hwp);
        free_netdev(ndev);