This is a note to let you know that I've just added the patch titled
crypto: ux500 - make interrupt mode plausible
to the 3.16-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:
crypto-ux500-make-interrupt-mode-plausible.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e1f8859ee265fc89bd21b4dca79e8e983a044892 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@xxxxxxxx>
Date: Thu, 26 Jun 2014 13:43:02 +0200
Subject: crypto: ux500 - make interrupt mode plausible
From: Arnd Bergmann <arnd@xxxxxxxx>
commit e1f8859ee265fc89bd21b4dca79e8e983a044892 upstream.
The interrupt handler in the ux500 crypto driver has an obviously
incorrect way to access the data buffer, which for a while has
caused this build warning:
../ux500/cryp/cryp_core.c: In function 'cryp_interrupt_handler':
../ux500/cryp/cryp_core.c:234:5: warning: passing argument 1 of '__fswab32' makes integer from pointer without a cast [enabled by default]
writel_relaxed(ctx->indata,
^
In file included from ../include/linux/swab.h:4:0,
from ../include/uapi/linux/byteorder/big_endian.h:12,
from ../include/linux/byteorder/big_endian.h:4,
from ../arch/arm/include/uapi/asm/byteorder.h:19,
from ../include/asm-generic/bitops/le.h:5,
from ../arch/arm/include/asm/bitops.h:340,
from ../include/linux/bitops.h:33,
from ../include/linux/kernel.h:10,
from ../include/linux/clk.h:16,
from ../drivers/crypto/ux500/cryp/cryp_core.c:12:
../include/uapi/linux/swab.h:57:119: note: expected '__u32' but argument is of type 'const u8 *'
static inline __attribute_const__ __u32 __fswab32(__u32 val)
There are at least two, possibly three problems here:
a) when writing into the FIFO, we copy the pointer rather than the
actual data we want to give to the hardware
b) the data pointer is an array of 8-bit values, while the FIFO
is 32-bit wide, so both the read and write access fail to do
a proper type conversion
c) This seems incorrect for big-endian kernels, on which we need to
byte-swap any register access, but not normally FIFO accesses,
at least the DMA case doesn't do it either.
This converts the bogus loop to use the same readsl/writesl pair
that we use for the two other modes (DMA and polling). This is
more efficient and consistent, and probably correct for endianess.
The bug has existed since the driver was first merged, and was
probably never detected because nobody tried to use interrupt mode.
It might make sense to backport this fix to stable kernels, depending
on how the crypto maintainers feel about that.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: Fabio Baltieri <fabio.baltieri@xxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/crypto/ux500/cryp/cryp_core.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
--- a/drivers/crypto/ux500/cryp/cryp_core.c
+++ b/drivers/crypto/ux500/cryp/cryp_core.c
@@ -190,7 +190,7 @@ static void add_session_id(struct cryp_c
static irqreturn_t cryp_interrupt_handler(int irq, void *param)
{
struct cryp_ctx *ctx;
- int i;
+ int count;
struct cryp_device_data *device_data;
if (param == NULL) {
@@ -215,12 +215,11 @@ static irqreturn_t cryp_interrupt_handle
if (cryp_pending_irq_src(device_data,
CRYP_IRQ_SRC_OUTPUT_FIFO)) {
if (ctx->outlen / ctx->blocksize > 0) {
- for (i = 0; i < ctx->blocksize / 4; i++) {
- *(ctx->outdata) = readl_relaxed(
- &device_data->base->dout);
- ctx->outdata += 4;
- ctx->outlen -= 4;
- }
+ count = ctx->blocksize / 4;
+
+ readsl(&device_data->base->dout, ctx->outdata, count);
+ ctx->outdata += count;
+ ctx->outlen -= count;
if (ctx->outlen == 0) {
cryp_disable_irq_src(device_data,
@@ -230,12 +229,12 @@ static irqreturn_t cryp_interrupt_handle
} else if (cryp_pending_irq_src(device_data,
CRYP_IRQ_SRC_INPUT_FIFO)) {
if (ctx->datalen / ctx->blocksize > 0) {
- for (i = 0 ; i < ctx->blocksize / 4; i++) {
- writel_relaxed(ctx->indata,
- &device_data->base->din);
- ctx->indata += 4;
- ctx->datalen -= 4;
- }
+ count = ctx->blocksize / 4;
+
+ writesl(&device_data->base->din, ctx->indata, count);
+
+ ctx->indata += count;
+ ctx->datalen -= count;
if (ctx->datalen == 0)
cryp_disable_irq_src(device_data,
Patches currently in stable-queue which might be from arnd@xxxxxxxx are
queue-3.16/crypto-ux500-make-interrupt-mode-plausible.patch
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