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Date: Thu, 21 Feb 2013 16:21:50 -0300
From: Fabio Estevam <fabio.estevam@...escale.com>
To: <davem@...emloft.net>
CC: <Frank.Li@...escale.com>, <s.hauer@...gutronix.de>,
<jim_baxter@...tor.com>, <netdev@...r.kernel.org>,
Fabio Estevam <fabio.estevam@...escale.com>
Subject: [PATCH] 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@...escale.com>
---
drivers/net/ethernet/freescale/fec.c | 30 +++++++++++++++---------------
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
index 29d82cf..2dbb36c 100644
--- 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);
--
1.7.9.5
--
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