[PATCH v2] alpha/PCI: Fix I/O port accessor argument order in pci_legacy_write()

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")
Tested-by: Magnus Lindholm <[email protected]>
Reviewed-by: Magnus Lindholm <[email protected]>
Cc: [email protected]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
---
Changes in v2:
 https://lore.kernel.org/linux-pci/[email protected]/

 - Collected Reviewed-by and Tested-by tags from Magnus Lindholm.

 arch/alpha/kernel/pci-sysfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c
index 94dbc470cd6c..7050f0f7fe3d 100644
--- a/arch/alpha/kernel/pci-sysfs.c
+++ b/arch/alpha/kernel/pci-sysfs.c
@@ -224,17 +224,17 @@ int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
 
 	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;
-- 
2.55.0