[PATCH AUTOSEL 5.4 068/350] media: meson/ao-cec: move cec_notifier_cec_adap_register after hw setup

Sasha Levin
2019-12-10T21:08:25Z

From: Neil Armstrong <narmstrong@baylibre.com>

[ Upstream commit 3e84a18a259e1df35e5b549ab92ec3baf82ff010 ]

When probed after the HDMI notifier, calling cec_notifier_cec_adap_register()
calls the enable() adapter callback, but the HW is not yet set up.

Moving cec_notifier_cec_adap_register() right before cec_register_adapter()
fixes the following crash:
Ignoring spurious kernel translation fault at virtual address 0000000000000008
[...]
Hardware name: Khadas VIM (DT)
[...]
pc : __do_kernel_fault+0xdc/0x120
lr : __do_kernel_fault+0xdc/0x120
[...]
Call trace:
__do_kernel_fault+0xdc/0x120
do_page_fault+0x180/0x458
do_translation_fault+0x64/0x70
do_mem_abort+0x3c/0x98
el1_da+0x20/0x94
meson_ao_cec_adap_enable+0x30/0x218 [ao_cec]
__cec_s_phys_addr+0x184/0x270
cec_s_phys_addr+0x44/0x60
cec_notifier_cec_adap_register+0x68/0x90
meson_ao_cec_probe+0xb0/0x288 [ao_cec]
[...]
el0_svc_compat+0x8/0x10

Reported-by: Christian Hewitt <christianshewitt@gmail.com>
Suggested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Fixes: 20958f9d5c48 ("media: meson/ao-cec: use cec_notifier_cec_adap_(un)register")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/platform/meson/ao-cec-g12a.c | 36 +++++++++++-----------
drivers/media/platform/meson/ao-cec.c | 30 +++++++++---------
2 files changed, 33 insertions(+), 33 deletions(-)

diff --git a/drivers/media/platform/meson/ao-cec-g12a.c b/drivers/media/platform/meson/ao-cec-g12a.c
index 3b39e875292e4..3d8fe854feb0a 100644
--- a/drivers/media/platform/meson/ao-cec-g12a.c
+++ b/drivers/media/platform/meson/ao-cec-g12a.c
@@ -662,34 +662,27 @@ static int meson_ao_cec_g12a_probe(struct platform_device *pdev)
if (IS_ERR(ao_cec->adap))
return PTR_ERR(ao_cec->adap);

- ao_cec->notify = cec_notifier_cec_adap_register(hdmi_dev, NULL,
- ao_cec->adap);
- if (!ao_cec->notify) {
- ret = -ENOMEM;
- goto out_probe_adapter;
- }
-
ao_cec->adap->owner = THIS_MODULE;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base)) {
ret = PTR_ERR(base);
- goto out_probe_notify;
+ goto out_probe_adapter;
}

ao_cec->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&meson_ao_cec_g12a_regmap_conf);
if (IS_ERR(ao_cec->regmap)) {
ret = PTR_ERR(ao_cec->regmap);
- goto out_probe_notify;
+ goto out_probe_adapter;
}

ao_cec->regmap_cec = devm_regmap_init(&pdev->dev, NULL, ao_cec,
&meson_ao_cec_g12a_cec_regmap_conf);
if (IS_ERR(ao_cec->regmap_cec)) {
ret = PTR_ERR(ao_cec->regmap_cec);
- goto out_probe_notify;
+ goto out_probe_adapter;
}

irq = platform_get_irq(pdev, 0);
@@ -699,45 +692,52 @@ static int meson_ao_cec_g12a_probe(struct platform_device *pdev)
0, NULL, ao_cec);
if (ret) {
dev_err(&pdev->dev, "irq request failed\n");
- goto out_probe_notify;
+ goto out_probe_adapter;
}

ao_cec->oscin = devm_clk_get(&pdev->dev, "oscin");
if (IS_ERR(ao_cec->oscin)) {
dev_err(&pdev->dev, "oscin clock request failed\n");
ret = PTR_ERR(ao_cec->oscin);
- goto out_probe_notify;
+ goto out_probe_adapter;
}

ret = meson_ao_cec_g12a_setup_clk(ao_cec);
if (ret)
- goto out_probe_notify;
+ goto out_probe_adapter;

ret = clk_prepare_enable(ao_cec->core);
if (ret) {
dev_err(&pdev->dev, "core clock enable failed\n");
- goto out_probe_notify;
+ goto out_probe_adapter;
}

device_reset_optional(&pdev->dev);

platform_set_drvdata(pdev, ao_cec);

+ ao_cec->notify = cec_notifier_cec_adap_register(hdmi_dev, NULL,
+ ao_cec->adap);
+ if (!ao_cec->notify) {
+ ret = -ENOMEM;
+ goto out_probe_core_clk;
+ }
+
ret = cec_register_adapter(ao_cec->adap, &pdev->dev);
if (ret < 0)
- goto out_probe_core_clk;
+ goto out_probe_notify;

/* Setup Hardware */
regmap_write(ao_cec->regmap, CECB_GEN_CNTL_REG, CECB_GEN_CNTL_RESET);

return 0;

-out_probe_core_clk:
- clk_disable_unprepare(ao_cec->core);
-
out_probe_notify:
cec_notifier_cec_adap_unregister(ao_cec->notify);

+out_probe_core_clk:
+ clk_disable_unprepare(ao_cec->core);
+
out_probe_adapter:
cec_delete_adapter(ao_cec->adap);

diff --git a/drivers/media/platform/meson/ao-cec.c b/drivers/media/platform/meson/ao-cec.c
index 64ed549bf0120..03600e8b3ef00 100644
--- a/drivers/media/platform/meson/ao-cec.c
+++ b/drivers/media/platform/meson/ao-cec.c
@@ -624,20 +624,13 @@ static int meson_ao_cec_probe(struct platform_device *pdev)
if (IS_ERR(ao_cec->adap))
return PTR_ERR(ao_cec->adap);

- ao_cec->notify = cec_notifier_cec_adap_register(hdmi_dev, NULL,
- ao_cec->adap);
- if (!ao_cec->notify) {
- ret = -ENOMEM;
- goto out_probe_adapter;
- }
-
ao_cec->adap->owner = THIS_MODULE;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ao_cec->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(ao_cec->base)) {
ret = PTR_ERR(ao_cec->base);
- goto out_probe_notify;
+ goto out_probe_adapter;
}

irq = platform_get_irq(pdev, 0);
@@ -647,20 +640,20 @@ static int meson_ao_cec_probe(struct platform_device *pdev)
0, NULL, ao_cec);
if (ret) {
dev_err(&pdev->dev, "irq request failed\n");
- goto out_probe_notify;
+ goto out_probe_adapter;
}

ao_cec->core = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(ao_cec->core)) {
dev_err(&pdev->dev, "core clock request failed\n");
ret = PTR_ERR(ao_cec->core);
- goto out_probe_notify;
+ goto out_probe_adapter;
}

ret = clk_prepare_enable(ao_cec->core);
if (ret) {
dev_err(&pdev->dev, "core clock enable failed\n");
- goto out_probe_notify;
+ goto out_probe_adapter;
}

ret = clk_set_rate(ao_cec->core, CEC_CLK_RATE);
@@ -674,9 +667,16 @@ static int meson_ao_cec_probe(struct platform_device *pdev)
ao_cec->pdev = pdev;
platform_set_drvdata(pdev, ao_cec);

+ ao_cec->notify = cec_notifier_cec_adap_register(hdmi_dev, NULL,
+ ao_cec->adap);
+ if (!ao_cec->notify) {
+ ret = -ENOMEM;
+ goto out_probe_clk;
+ }
+
ret = cec_register_adapter(ao_cec->adap, &pdev->dev);
if (ret < 0)
- goto out_probe_clk;
+ goto out_probe_notify;

/* Setup Hardware */
writel_relaxed(CEC_GEN_CNTL_RESET,
@@ -684,12 +684,12 @@ static int meson_ao_cec_probe(struct platform_device *pdev)

return 0;

-out_probe_clk:
- clk_disable_unprepare(ao_cec->core);
-
out_probe_notify:
cec_notifier_cec_adap_unregister(ao_cec->notify);

+out_probe_clk:
+ clk_disable_unprepare(ao_cec->core);
+
out_probe_adapter:
cec_delete_adapter(ao_cec->adap);

--
2.20.1