[PATCH] 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 at gmail.com>
---
 drivers/cache/sifive_ccache.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cache/sifive_ccache.c b/drivers/cache/sifive_ccache.c
index 2acb8bdf06d52..b4033110f34e5 100644
--- a/drivers/cache/sifive_ccache.c
+++ b/drivers/cache/sifive_ccache.c
@@ -262,6 +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 < 0)
+		return dev_err_probe(dev, intr_num,
+				     "Failed to count interrupts\n");
 	if (!intr_num)
 		return dev_err_probe(dev, -ENODEV, "No interrupts property\n");
 

base-commit: 24a19b953e2a3d0ea5a8c4951a0ab8f32720c907
-- 
2.43.0