[PATCH] net: fealnx: make driver work on architectures without I/O ports

Ethan Nelson-Moore
2026-04-28T02:12:29Z

Devices supported by the fealnx driver support both MMIO and PIO access
(they have a PCI BAR for each). However, the driver always tries to use
the PIO BAR on architectures other than Alpha. This makes the driver
not work on architectures without I/O port mapping support. The comment
explaining why this was done explains that some x86 systems have issues
with MMIO. To enable the driver on all architectures while preventing
potential regressions, change the driver to only use PIO on x86.

Issue discovered by manual inspection.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
---
drivers/net/ethernet/fealnx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/fealnx.c b/drivers/net/ethernet/fealnx.c
index 3c9961806f75..51dd09107242 100644
--- a/drivers/net/ethernet/fealnx.c
+++ b/drivers/net/ethernet/fealnx.c
@@ -91,7 +91,7 @@ static int full_duplex[MAX_UNITS] = { -1, -1, -1, -1, -1, -1, -1, -1 };

/* This driver was written to use PCI memory space, however some x86 systems
work only with I/O space accesses. */
-#ifndef __alpha__
+#ifdef CONFIG_X86
#define USE_IO_OPS
#endif

--
2.43.0