This is a note to let you know that I've just added the patch titled
VME: Correct read/write alignment algorithm
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vme-correct-read-write-alignment-algorithm.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f0342e66b397947ed8c3eef8c37b5ca2d5b1bb50 Mon Sep 17 00:00:00 2001
From: Martyn Welch <martyn.welch@xxxxxx>
Date: Fri, 7 Feb 2014 15:48:56 +0000
Subject: VME: Correct read/write alignment algorithm
From: Martyn Welch <martyn.welch@xxxxxx>
commit f0342e66b397947ed8c3eef8c37b5ca2d5b1bb50 upstream.
In order to ensure the correct width cycles on the VME bus, the VME bridge
drivers implement an algorithm to utilise the largest possible width reads and
writes whilst maintaining natural alignment constraints. The algorithm
currently looks at the start address rather than the current read/write address
when determining whether a 16-bit width cycle is required to get to 32-bit
alignment. This results in incorrect alignment,
Reported-by: Jim Strouth <james.strouth@xxxxxx>
Tested-by: Jim Strouth <james.strouth@xxxxxx>
Signed-off-by: Martyn Welch <martyn.welch@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/vme/bridges/vme_ca91cx42.c | 4 ++--
drivers/vme/bridges/vme_tsi148.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/vme/bridges/vme_ca91cx42.c
+++ b/drivers/vme/bridges/vme_ca91cx42.c
@@ -884,7 +884,7 @@ static ssize_t ca91cx42_master_read(stru
if (done == count)
goto out;
}
- if ((uintptr_t)addr & 0x2) {
+ if ((uintptr_t)(addr + done) & 0x2) {
if ((count - done) < 2) {
*(u8 *)(buf + done) = ioread8(addr + done);
done += 1;
@@ -938,7 +938,7 @@ static ssize_t ca91cx42_master_write(str
if (done == count)
goto out;
}
- if ((uintptr_t)addr & 0x2) {
+ if ((uintptr_t)(addr + done) & 0x2) {
if ((count - done) < 2) {
iowrite8(*(u8 *)(buf + done), addr + done);
done += 1;
--- a/drivers/vme/bridges/vme_tsi148.c
+++ b/drivers/vme/bridges/vme_tsi148.c
@@ -1289,7 +1289,7 @@ static ssize_t tsi148_master_read(struct
if (done == count)
goto out;
}
- if ((uintptr_t)addr & 0x2) {
+ if ((uintptr_t)(addr + done) & 0x2) {
if ((count - done) < 2) {
*(u8 *)(buf + done) = ioread8(addr + done);
done += 1;
@@ -1371,7 +1371,7 @@ static ssize_t tsi148_master_write(struc
if (done == count)
goto out;
}
- if ((uintptr_t)addr & 0x2) {
+ if ((uintptr_t)(addr + done) & 0x2) {
if ((count - done) < 2) {
iowrite8(*(u8 *)(buf + done), addr + done);
done += 1;
Patches currently in stable-queue which might be from martyn.welch@xxxxxx are
queue-3.12/vme-correct-read-write-alignment-algorithm.patch
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