diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2016-11-29 12:13:38 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-11-29 17:35:06 +0100 |
| commit | 5c3ef39738f74a3759918cc1a1ad099504f9d1b7 (patch) | |
| tree | a29d2bee4b6726435e743819dc4ef4b04f32d652 | |
| parent | ahci: always fall back to single-MSI mode (diff) | |
| download | linux-5c3ef39738f74a3759918cc1a1ad099504f9d1b7.tar.xz linux-5c3ef39738f74a3759918cc1a1ad099504f9d1b7.zip | |
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>
| -rw-r--r-- | drivers/ata/sata_mv.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index efc48bf89d51..823e938c9a78 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -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); |