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crypto: atmel-tdes - Clarify how tdes dev gets allocated to the tfm

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The tdes dev gets allocated to the tfm at alg->init time, there's no
need to overwrite the pointer to tdes_dd afterwards.
There's a single IP per SoC anyway, the first entry from the
atmel_tdes.dev_list is chosen without counting for tfms for example,
in case one thinks of an even distribution of tfms across the TDES
IPs: there's only one. At alg->init time the ctx->dd should already
be NULL, there's no need to check its value before requesting for a
tdes dev.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tudor Ambarus 2021-07-20 11:55:27 +03:00 committed by Herbert Xu
parent a7fc80bb22
commit 632a761abb
1 changed files with 9 additions and 19 deletions
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28
drivers/crypto/atmel-tdes.c
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@ -196,23 +196,15 @@ static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
atmel_tdes_write(dd, offset, *value);
}
static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx)
static struct atmel_tdes_dev *atmel_tdes_dev_alloc(void)
{
struct atmel_tdes_dev *tdes_dd = NULL;
struct atmel_tdes_dev *tmp;
struct atmel_tdes_dev *tdes_dd;
spin_lock_bh(&atmel_tdes.lock);
if (!ctx->dd) {
list_for_each_entry(tmp, &atmel_tdes.dev_list, list) {
tdes_dd = tmp;
break;
}
ctx->dd = tdes_dd;
} else {
tdes_dd = ctx->dd;
}
/* One TDES IP per SoC. */
tdes_dd = list_first_entry_or_null(&atmel_tdes.dev_list,
struct atmel_tdes_dev, list);
spin_unlock_bh(&atmel_tdes.lock);
return tdes_dd;
}
@ -646,7 +638,6 @@ static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
rctx->mode &= TDES_FLAGS_MODE_MASK;
dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
dd->ctx = ctx;
ctx->dd = dd;
err = atmel_tdes_write_ctrl(dd);
if (!err)
@ -897,14 +888,13 @@ static int atmel_tdes_ofb_decrypt(struct skcipher_request *req)
static int atmel_tdes_init_tfm(struct crypto_skcipher *tfm)
{
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
struct atmel_tdes_dev *dd;
ctx->dd = atmel_tdes_dev_alloc();
if (!ctx->dd)
return -ENODEV;
crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_tdes_reqctx));
dd = atmel_tdes_find_dev(ctx);
if (!dd)
return -ENODEV;
return 0;
}