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authorRussell King <rmk+kernel@armlinux.org.uk>2019-10-02 17:45:11 +0100
committerRussell King <rmk+kernel@armlinux.org.uk>2019-10-09 22:59:30 +0100
commite963408e8ff439e2b9da20e5399d7dca21462fcc (patch)
tree80ac163694a675256ace64c1a02c92376d22c29b /drivers/amba/bus.c
parent79bdcb202a35bf2701779afafa0db07e2852d46b (diff)
downloadlinux-e963408e8ff439e2b9da20e5399d7dca21462fcc.tar.bz2
drivers/amba: fix reset control error handling
With commit 79bdcb202a35 ("ARM: 8906/1: drivers/amba: add reset control to amba bus probe") it is possible for the the amba bus driver to defer probing the device for its IDs because the reset driver may be probed later. However when a subsequent probe occurs, the call to request_resource() in the driver returns -EBUSY as the driver has not released the resource from the initial probe attempt - or cleaned up any of the preceding actions. Fix this both for the deferred probe case as well as a failure to get the reset. Fixes: 79bdcb202a35 ("ARM: 8906/1: drivers/amba: add reset control to amba bus probe") Reported-by: Dinh Nguyen <dinguyen@kernel.org> Tested-by: Dinh Nguyen <dinguyen@kernel.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'drivers/amba/bus.c')
-rw-r--r--drivers/amba/bus.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index f39f075abff9..fe1523664816 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -409,9 +409,11 @@ static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
*/
rstc = of_reset_control_array_get_optional_shared(dev->dev.of_node);
if (IS_ERR(rstc)) {
- if (PTR_ERR(rstc) != -EPROBE_DEFER)
- dev_err(&dev->dev, "Can't get amba reset!\n");
- return PTR_ERR(rstc);
+ ret = PTR_ERR(rstc);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&dev->dev, "can't get reset: %d\n",
+ ret);
+ goto err_reset;
}
reset_control_deassert(rstc);
reset_control_put(rstc);
@@ -472,6 +474,12 @@ static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
release_resource(&dev->res);
err_out:
return ret;
+
+ err_reset:
+ amba_put_disable_pclk(dev);
+ iounmap(tmp);
+ dev_pm_domain_detach(&dev->dev, true);
+ goto err_release;
}
/*