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ata: sata_mv: check for errors when parsing nr-ports from dt 

If the nr-ports property is missing ata_host_alloc_pinfo is called with
n_ports = 0. This results in host->ports[0] = NULL which later makes
mv_init_host() oops when dereferencing this pointer.

Instead be a bit more cooperative and fail the probing with an error
message.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Uwe Kleine-König 2016-11-29 12:13:38 +01:00 committed by Tejun Heo
parent 6929ef385e
commit 5c3ef39738
1 changed files with 14 additions and 1 deletions
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15
drivers/ata/sata_mv.c
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@ -4090,7 +4090,20 @@ static int mv_platform_probe(struct platform_device *pdev)
/* allocate host */
if (pdev->dev.of_node) {
of_property_read_u32(pdev->dev.of_node, "nr-ports", &n_ports);
rc = of_property_read_u32(pdev->dev.of_node, "nr-ports",
&n_ports);
if (rc) {
dev_err(&pdev->dev,
"error parsing nr-ports property: %d\n", rc);
return rc;
}
if (n_ports <= 0) {
dev_err(&pdev->dev, "nr-ports must be positive: %d\n",
n_ports);
return -EINVAL;
}
irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
} else {
mv_platform_data = dev_get_platdata(&pdev->dev);