[PATCH v3] cache: sifive_ccache: propagate IRQ count errors

[Avi Weiss]

platform_irq_count() returns -EPROBE_DEFER when the
interrupt provider is not ready, but
sifive_ccache_probe() only checks for a zero count.

-EPROBE_DEFER seems to be the only negative return
code possible here (currently).

A negative count skips the IRQ registration loop and
allows the probe to return success without requesting
a deferred retry.

Return negative IRQ counts so the driver is reprobed
when the interrupt provider becomes available.

Fixes: c90847bcbfb6 ("cache: sifive_ccache: Partially convert to a platform driver")
Signed-off-by: Avi Weiss <thnkslprpt@xxxxxxxxx>
---
Changes in v3:
- align the dev_err_probe() argument as suggested by Jonathan Cameron

v2: https://lore.kernel.org/r/20261015084502.3061706-1-thnkslprpt@xxxxxxxxx/

 drivers/cache/sifive_ccache.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/cache/sifive_ccache.c b/drivers/cache/sifive_ccache.c
index 2acb8bdf06d52..f64ab6aab651a 100644
--- a/drivers/cache/sifive_ccache.c
+++ b/drivers/cache/sifive_ccache.c
@@ -262,8 +262,9 @@ static int sifive_ccache_probe(struct platform_device *pdev)
 	quirks = (unsigned long)device_get_match_data(dev);
 
 	intr_num = platform_irq_count(pdev);
-	if (!intr_num)
-		return dev_err_probe(dev, -ENODEV, "No interrupts property\n");
+	if (intr_num <= 0)
+		return dev_err_probe(dev, intr_num ?: -ENODEV,
+				     "No interrupts property\n");
 
 	for (int i = 0; i < intr_num; i++) {
 		if (i == DATA_UNCORR && (quirks & QUIRK_BROKEN_DATA_UNCORR))

base-commit: 0fcb05b72344f40806cbe810de8872f1698bf053
-- 
2.43.0