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net/at91_ether: avoid NULL pointer dereference 

The at91_ether driver calls macb_mii_init passing a 'struct macb'
structure whose tx_clk member is initialized to 0. However,
macb_handle_link_change() expects tx_clk to be the result of
a call to clk_get, and so IS_ERR(tx_clk) to be true if the clock
is invalid. This causes an oops when booting Linux 3.14 on the
csb637 board. The following changes avoids this.

Signed-off-by: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gilles Chanteperdrix 2014-04-06 20:37:44 +02:00 committed by David S. Miller
parent 065d7e3956
commit c293fb785b
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/cadence/at91_ether.c
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@ -342,6 +342,9 @@ static int __init at91ether_probe(struct platform_device *pdev)
}
clk_enable(lp->pclk);
lp->hclk = ERR_PTR(-ENOENT);
lp->tx_clk = ERR_PTR(-ENOENT);
/* Install the interrupt handler */
dev->irq = platform_get_irq(pdev, 0);
res = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt, 0, dev->name, dev);