[PATCH] smsc911x: allow using IRQ0

[PATCH] smsc911x: allow using IRQ0

[Sergey Shtylyov]

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>
CC: stable@vger.kernel.org

---
This patch is against DaveM's 'net.git' repo.

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

Index: net/drivers/net/ethernet/smsc/smsc911x.c
===================================================================
--- net.orig/drivers/net/ethernet/smsc/smsc911x.c
+++ net/drivers/net/ethernet/smsc/smsc911x.c
@@ -2431,7 +2431,7 @@ static int smsc911x_drv_probe(struct pla
 	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;

Re: [PATCH] smsc911x: allow using IRQ0

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 2 May 2022 23:14:09 +0300 you wrote:
> 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...
> 
> [...]

Here is the summary with links:
  - smsc911x: allow using IRQ0
    https://git.kernel.org/netdev/net/c/5ef9b803a4af

You are awesome, thank you!
-- 
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