[PATCH] staging: nvec: propagate error codes in tegra_nvec_probe()

[Artem Lytkin <iprintercanon@gmail.com>]

Several error paths in tegra_nvec_probe() return -ENODEV instead of
propagating the actual error code from the called function. This
prevents probe deferral from working correctly when a dependency
(clock, IRQ) is not yet available.

Fix this for platform_get_irq(), devm_clk_get(), and
devm_request_irq() by propagating their return values. Use
dev_err_probe() for the latter two to suppress log messages during
deferred probing.

The remaining -ENODEV returns for missing device tree node and
slave-addr property are left unchanged as those are permanent
configuration errors unrelated to probe deferral.

Signed-off-by: Artem Lytkin <iprintercanon@gmail.com>
---
 drivers/staging/nvec/nvec.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index 263774e6a..c4e383de5 100644
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -809,13 +809,12 @@ static int tegra_nvec_probe(struct platform_device *pdev)
 
 	nvec->irq = platform_get_irq(pdev, 0);
 	if (nvec->irq < 0)
-		return -ENODEV;
+		return nvec->irq;
 
 	i2c_clk = devm_clk_get(dev, "div-clk");
-	if (IS_ERR(i2c_clk)) {
-		dev_err(dev, "failed to get controller clock\n");
-		return -ENODEV;
-	}
+	if (IS_ERR(i2c_clk))
+		return dev_err_probe(dev, PTR_ERR(i2c_clk),
+				     "failed to get controller clock\n");
 
 	nvec->rst = devm_reset_control_get_exclusive(dev, "i2c");
 	if (IS_ERR(nvec->rst)) {
@@ -847,10 +846,8 @@ static int tegra_nvec_probe(struct platform_device *pdev)
 
 	err = devm_request_irq(dev, nvec->irq, nvec_interrupt, IRQF_NO_AUTOEN,
 			       "nvec", nvec);
-	if (err) {
-		dev_err(dev, "couldn't request irq\n");
-		return -ENODEV;
-	}
+	if (err)
+		return dev_err_probe(dev, err, "couldn't request irq\n");
 
 	tegra_init_i2c_slave(nvec);
 
-- 
2.43.0