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crypto: zynqmp-sha - Add locking

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The hardwrae is only capable of one hash at a time, so add a lock
to make sure that it isn't used concurrently.

Fixes: 7ecc3e3447 ("crypto: xilinx - Add Xilinx SHA3 driver")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2025-04-12 18:57:22 +08:00
parent 04bfa4c7d5
commit c7e6804362
1 changed files with 14 additions and 4 deletions
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18
drivers/crypto/xilinx/zynqmp-sha.c
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@@ -3,18 +3,19 @@
* Xilinx ZynqMP SHA Driver.
* Copyright (c) 2022 Xilinx Inc.
*/
#include <linux/cacheflush.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <crypto/sha3.h>
#include <linux/crypto.h>
#include <linux/cacheflush.h>
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/firmware/xlnx-zynqmp.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#define ZYNQMP_DMA_BIT_MASK 32U
@@ -43,6 +44,8 @@ struct zynqmp_sha_desc_ctx {
static dma_addr_t update_dma_addr, final_dma_addr;
static char *ubuf, *fbuf;
static DEFINE_SPINLOCK(zynqmp_sha_lock);
static int zynqmp_sha_init_tfm(struct crypto_shash *hash)
{
const char *fallback_driver_name = crypto_shash_alg_name(hash);
@@ -130,7 +133,8 @@ static int zynqmp_sha_export(struct shash_desc *desc, void *out)
return crypto_shash_export(&dctx->fbk_req, out);
}
static int zynqmp_sha_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
static int __zynqmp_sha_digest(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
unsigned int remaining_len = len;
int update_size;
@@ -165,6 +169,12 @@ static int zynqmp_sha_digest(struct shash_desc *desc, const u8 *data, unsigned i
return ret;
}
static int zynqmp_sha_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
{
scoped_guard(spinlock_bh, &zynqmp_sha_lock)
return __zynqmp_sha_digest(desc, data, len, out);
}
static struct zynqmp_sha_drv_ctx sha3_drv_ctx = {
.sha3_384 = {
.init = zynqmp_sha_init,