[PATCH 5.15 081/935] alpha/PCI: Fix I/O port accessor argument order in pci_legacy_write()

5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Krzysztof Wilczyński <kwilczynski@kernel.org>

commit 651fb94aaf245430590216d497fb8b02dd73d5f9 upstream.

pci_legacy_write() in arch/alpha/kernel/pci-sysfs.c passes its arguments to
outb(), outw() and outl() in the wrong order:

  outb(port, val);

The Alpha I/O accessors in arch/alpha/include/asm/io.h take the value first
and the port second:

  extern void outb(u8 b, unsigned long port);

So the port number is written as data to the I/O address taken from the
user-supplied value, and the intended write to the requested port never
happens.

The arguments have been reversed since the file was added, and the function
returns the access size regardless, so the caller sees success while the
requested port is left untouched.

Fixes: 10a0ef39fbd1 ("PCI/alpha: pci sysfs resources")
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Reviewed-by: Magnus Lindholm <linmag7@gmail.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Cc: <redacted>
Link: https://patch.msgid.link/20260706175423.98305-1-kwilczynski@kernel.org (local)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/alpha/kernel/pci-sysfs.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/alpha/kernel/pci-sysfs.c
+++ b/arch/alpha/kernel/pci-sysfs.c

@@ -364,17 +364,17 @@ int pci_legacy_write(struct pci_bus *bus
 
 	switch(size) {
 	case 1:
-		outb(port, val);
+		outb(val, port);
 		return 1;
 	case 2:
 		if (port & 1)
 			return -EINVAL;
-		outw(port, val);
+		outw(val, port);
 		return 2;
 	case 4:
 		if (port & 3)
 			return -EINVAL;
-		outl(port, val);
+		outl(val, port);
 		return 4;
 	}
 	return -EINVAL;