From 5ef9b803a4af0f5e42012176889b40bb2a978b18 Mon Sep 17 00:00:00 2001
From: Sergey Shtylyov <s.shtylyov@omp.ru>
Date: Mon, 2 May 2022 23:14:09 +0300
Subject: [PATCH] smsc911x: allow using IRQ0
Git-commit: 5ef9b803a4af0f5e42012176889b40bb2a978b18
Patch-mainline: v5.18-rc6
References: git-fixes

The AlphaProject AP-SH4A-3A/AP-SH4AD-0A SH boards use IRQ0 for their SMSC
LAN911x Ethernet chip, so the networking on them must have been broken by
commit 965b2aa78fbc ("net/smsc911x: fix irq resource allocation failure")
which filtered out 0 as well as the negative error codes -- it was kinda
correct at the time, as platform_get_irq() could return 0 on of_irq_get()
failure and on the actual 0 in an IRQ resource.  This issue was fixed by
me (back in 2016!), so we should be able to fix this driver to allow IRQ0
usage again...

When merging this to the stable kernels, make sure you also merge commit
e330b9a6bb35 ("platform: don't return 0 from platform_get_irq[_byname]()
on error") -- that's my fix to platform_get_irq() for the DT platforms...

Fixes: 965b2aa78fbc ("net/smsc911x: fix irq resource allocation failure")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/656036e4-6387-38df-b8a7-6ba683b16e63@omp.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/ethernet/smsc/smsc911x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c
index 7a50ba00f8ae..c854efdf1f25 100644
--- a/drivers/net/ethernet/smsc/smsc911x.c
+++ b/drivers/net/ethernet/smsc/smsc911x.c
@@ -2431,7 +2431,7 @@ static int smsc911x_drv_probe(struct platform_device *pdev)
 	if (irq == -EPROBE_DEFER) {
 		retval = -EPROBE_DEFER;
 		goto out_0;
-	} else if (irq <= 0) {
+	} else if (irq < 0) {
 		pr_warn("Could not allocate irq resource\n");
 		retval = -ENODEV;
 		goto out_0;
-- 
2.31.1