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Subject[PATCH 1/3] crypto: stm32/hash - defer probe for reset controller
Date
From: Etienne Carriere <etienne.carriere@st.com>

Change stm32 HASH driver to defer its probe operation when
reset controller device is registered but has not been probed yet.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Reviewed-by: Lionel DEBIEVE <lionel.debieve@st.com>
---
drivers/crypto/stm32/stm32-hash.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index 167b80eec437..fad6190be088 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -1482,7 +1482,12 @@ static int stm32_hash_probe(struct platform_device *pdev)
pm_runtime_enable(dev);

hdev->rst = devm_reset_control_get(&pdev->dev, NULL);
- if (!IS_ERR(hdev->rst)) {
+ if (IS_ERR(hdev->rst)) {
+ if (PTR_ERR(hdev->rst) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto err_reset;
+ }
+ } else {
reset_control_assert(hdev->rst);
udelay(2);
reset_control_deassert(hdev->rst);
@@ -1535,7 +1540,7 @@ static int stm32_hash_probe(struct platform_device *pdev)

if (hdev->dma_lch)
dma_release_channel(hdev->dma_lch);
-
+err_reset:
pm_runtime_disable(dev);
pm_runtime_put_noidle(dev);

--
2.17.1
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