From f51dab67262f8b3abf09177c7b813a7f4d6ccf9a Mon Sep 17 00:00:00 2001 From: Sebastian Siewior Date: Sun, 21 Oct 2007 16:18:12 +0800 Subject: [PATCH] [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 Signed-off-by: Herbert Xu --- drivers/crypto/geode-aes.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/crypto/geode-aes.c b/drivers/crypto/geode-aes.c index 6c04f1363e6d4..6c6a31b979be7 100644 --- a/drivers/crypto/geode-aes.c +++ b/drivers/crypto/geode-aes.c @@ -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); -- 2.39.5