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net/fsl_pq_mdio: check TBI address for consistency with mapped range

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When configuring the MDIO subsystem it is also necessary to configure
the TBI register. Make sure the TBI is contained within the mapped
register range in order to:
a) make sure the address is computed correctly
b) make users aware that we're actually accessing that register

In case of error, print a message but continue anyway.

Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
Cc: Timur Tabi <timur@tabi.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerlando Falauto 2015-10-12 09:18:40 +02:00 committed by David S. Miller
parent e844463743
commit 3dd03e52a4
1 changed files with 10 additions and 0 deletions
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10
drivers/net/ethernet/freescale/fsl_pq_mdio.c
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@ -445,6 +445,16 @@ static int fsl_pq_mdio_probe(struct platform_device *pdev)
tbipa = data->get_tbipa(priv->map);
/*
* Add consistency check to make sure TBI is contained
* within the mapped range (not because we would get a
* segfault, rather to catch bugs in computing TBI
* address). Print error message but continue anyway.
*/
if ((void *)tbipa > priv->map + resource_size(&res) - 4)
dev_err(&pdev->dev, "invalid register map (should be at least 0x%04x to contain TBI address)\n",
((void *)tbipa - priv->map) + 4);
iowrite32be(be32_to_cpup(prop), tbipa);
}
}