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net: ll_temac: Use devm_platform_ioremap_resource_byname()

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platform_get_resource() may fail and return NULL, so we had better
check its return value to avoid a NULL pointer dereference a bit later
in the code. Fix it to use devm_platform_ioremap_resource_byname()
instead of calling platform_get_resource_byname() and devm_ioremap().

Fixes: 8425c41d1e ("net: ll_temac: Extend support to non-device-tree platforms")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wang Hai 2020-07-30 15:24:19 +08:00 committed by David S. Miller
parent 3ce38d39ee
commit bd69058f50
1 changed files with 2 additions and 4 deletions
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6
drivers/net/ethernet/xilinx/ll_temac_main.c
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@ -1407,10 +1407,8 @@ static int temac_probe(struct platform_device *pdev)
}
/* map device registers */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
lp->regs = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!lp->regs) {
lp->regs = devm_platform_ioremap_resource_byname(pdev, 0);
if (IS_ERR(lp->regs)) {
dev_err(&pdev->dev, "could not map TEMAC registers\n");
return -ENOMEM;
}