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

[Krzysztof Wilczyński]

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")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Krzysztof Wilczyński <kwilczynski@xxxxxxxxxx>
---
 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 3048758304b5..354ec5f10ad0 100644
--- a/arch/alpha/kernel/pci-sysfs.c
+++ b/arch/alpha/kernel/pci-sysfs.c
@@ -355,17 +355,17 @@ 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;
-- 
2.54.0