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[CRYPTO] geode: relax in busy loop and care about return value 

The code waits in a busy loop until the hardware finishes the encryption
or decryption process. This wants a cpu_relax() :)
The busy loop finishes either if the encryption is done or if the counter
is zero. If the latter is true than the hardware failed. Since this
should not happen, leave sith a BUG().

Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
hifive-unleashed-5.1
Sebastian Siewior 2007-10-21 16:18:12 +08:00 committed by Herbert Xu
parent 2d506d4fa1
commit 1f4e477376
1 changed files with 6 additions and 3 deletions
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9
drivers/crypto/geode-aes.c
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@ -88,9 +88,10 @@ do_crypt(void *src, void *dst, int len, u32 flags)
/* Start the operation */
iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
do
do {
status = ioread32(_iobase + AES_INTR_REG);
while(!(status & AES_INTRA_PENDING) && --counter);
cpu_relax();
} while(!(status & AES_INTRA_PENDING) && --counter);
/* Clear the event */
iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
@ -102,6 +103,7 @@ geode_aes_crypt(struct geode_aes_op *op)
{
u32 flags = 0;
unsigned long iflags;
int ret;
if (op->len == 0)
return 0;
@ -130,7 +132,8 @@ geode_aes_crypt(struct geode_aes_op *op)
_writefield(AES_WRITEKEY0_REG, op->key);
}
do_crypt(op->src, op->dst, op->len, flags);
ret = do_crypt(op->src, op->dst, op->len, flags);
BUG_ON(ret);
if (op->mode == AES_MODE_CBC)
_readfield(AES_WRITEIV0_REG, op->iv);