diff mbox series

[5.11,220/775] macintosh/adb-iop: Use big-endian autopoll mask

Message ID 20210301161212.495956807@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman March 1, 2021, 4:06 p.m. UTC 
From: Finn Thain <fthain@telegraphics.com.au>

[ Upstream commit c396dd2ec5bbd1cb80eafe32a72ab6bd6b17cb5a ]

As usual, the available documentation is inadequate and leaves endianness
unspecified for message data. However, testing shows that this patch does
improve correctness. The mistake should have been detected earlier but it
was obscured by other bugs. In testing, this patch reinstated pre-v5.9
behaviour. The old driver bugs remain and ADB input devices may stop
working. But that appears to be unrelated.

Cc: Joshua Thompson <funaho@jurai.org>
Fixes: c66da95a39ec ("macintosh/adb-iop: Implement SRQ autopolling")
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20210125074524.3027452-1-geert@linux-m68k.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/macintosh/adb-iop.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/macintosh/adb-iop.c b/drivers/macintosh/adb-iop.c
index 0ee3272491501..2633bc254935c 100644
--- a/drivers/macintosh/adb-iop.c
+++ b/drivers/macintosh/adb-iop.c
@@ -19,6 +19,7 @@ 
 #include <asm/macints.h>
 #include <asm/mac_iop.h>
 #include <asm/adb_iop.h>
+#include <asm/unaligned.h>
 
 #include <linux/adb.h>
 
@@ -249,7 +250,7 @@  static void adb_iop_set_ap_complete(struct iop_msg *msg)
 {
 	struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
 
-	autopoll_devs = (amsg->data[1] << 8) | amsg->data[0];
+	autopoll_devs = get_unaligned_be16(amsg->data);
 	if (autopoll_devs & (1 << autopoll_addr))
 		return;
 	autopoll_addr = autopoll_devs ? (ffs(autopoll_devs) - 1) : 0;
@@ -266,8 +267,7 @@  static int adb_iop_autopoll(int devs)
 	amsg.flags = ADB_IOP_SET_AUTOPOLL | (mask ? ADB_IOP_AUTOPOLL : 0);
 	amsg.count = 2;
 	amsg.cmd = 0;
-	amsg.data[0] = mask & 0xFF;
-	amsg.data[1] = (mask >> 8) & 0xFF;
+	put_unaligned_be16(mask, amsg.data);
 
 	iop_send_message(ADB_IOP, ADB_CHAN, NULL, sizeof(amsg), (__u8 *)&amsg,
 			 adb_iop_set_ap_complete);