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authorEzequiel Garcia <ezequiel.garcia@free-electrons.com>2014-02-16 19:29:53 +0400
committerTejun Heo <tj@kernel.org>2014-02-16 20:51:17 +0400
commit8ad116e649b21a42e3cccfb3c1b8d5ea52ba19e5 (patch)
treec5a69d0a235864821b6ad4d46c9a280b72f95e7f /drivers/ata/sata_mv.c
parent9f9c47f00ce99329b1a82e2ac4f70f0fe3db549c (diff)
downloadlinux-8ad116e649b21a42e3cccfb3c1b8d5ea52ba19e5.tar.xz
ata: sata_mv: Cleanup only the initialized ports
When an error occurs in the port initialization loop, currently the driver tries to cleanup all the ports. This results in a NULL pointer dereference if the ports were only partially initialized. Fix this by updating only the number of initialized ports (either with failure or successfully), before jumping to the error path and looping over that number in the cleanup loop. Cc: Andrew Lunn <andrew@lunn.ch> Reported-by: Mikael Pettersson <mikpelinux@gmail.com> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/ata/sata_mv.c')
-rw-r--r--drivers/ata/sata_mv.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 20a7517bd339..9c1a11de3044 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -4104,7 +4104,6 @@ static int mv_platform_probe(struct platform_device *pdev)
if (!hpriv->port_phys)
return -ENOMEM;
host->private_data = hpriv;
- hpriv->n_ports = n_ports;
hpriv->board_idx = chip_soc;
host->iomap = NULL;
@@ -4132,11 +4131,17 @@ static int mv_platform_probe(struct platform_device *pdev)
hpriv->port_phys[port] = NULL;
if ((rc != -EPROBE_DEFER) && (rc != -ENODEV))
dev_warn(&pdev->dev, "error getting phy");
+
+ /* Cleanup only the initialized ports */
+ hpriv->n_ports = port;
goto err;
} else
phy_power_on(hpriv->port_phys[port]);
}
+ /* All the ports have been initialized */
+ hpriv->n_ports = n_ports;
+
/*
* (Re-)program MBUS remapping windows if we are asked to.
*/
@@ -4174,7 +4179,7 @@ err:
clk_disable_unprepare(hpriv->clk);
clk_put(hpriv->clk);
}
- for (port = 0; port < n_ports; port++) {
+ for (port = 0; port < hpriv->n_ports; port++) {
if (!IS_ERR(hpriv->port_clks[port])) {
clk_disable_unprepare(hpriv->port_clks[port]);
clk_put(hpriv->port_clks[port]);