crypto: omap-sham - replace flags operation with atomic bit operations
Some flags are changed in interrupt handlers and verified in the tasklet.
There might be a race condition when tasklet is interrupted or another
cpu/core will run IRQ handler and tasklet in parallel.
Atomic bitops functions are now used instead of bitmask operations.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 64698ad..208404e 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -240,7 +240,7 @@
{
clk_enable(dd->iclk);
- if (!(dd->flags & BIT(FLAGS_INIT))) {
+ if (!test_bit(FLAGS_INIT, &dd->flags)) {
omap_sham_write_mask(dd, SHA_REG_MASK,
SHA_REG_MASK_SOFTRESET, SHA_REG_MASK_SOFTRESET);
@@ -248,7 +248,7 @@
SHA_REG_SYSSTATUS_RESETDONE))
return -ETIMEDOUT;
- dd->flags |= BIT(FLAGS_INIT);
+ set_bit(FLAGS_INIT, &dd->flags);
dd->err = 0;
}
@@ -303,7 +303,7 @@
return -ETIMEDOUT;
if (final)
- ctx->flags |= BIT(FLAGS_FINAL); /* catch last interrupt */
+ set_bit(FLAGS_FINAL, &ctx->flags); /* catch last interrupt */
len32 = DIV_ROUND_UP(length, sizeof(u32));
@@ -336,9 +336,9 @@
ctx->digcnt += length;
if (final)
- ctx->flags |= BIT(FLAGS_FINAL); /* catch last interrupt */
+ set_bit(FLAGS_FINAL, &ctx->flags); /* catch last interrupt */
- dd->flags |= BIT(FLAGS_DMA_ACTIVE);
+ set_bit(FLAGS_DMA_ACTIVE, &dd->flags);
omap_start_dma(dd->dma_lch);
@@ -642,7 +642,7 @@
if (!err) {
omap_sham_copy_hash(req, 1);
- if (ctx->flags & BIT(FLAGS_FINAL))
+ if (test_bit(FLAGS_FINAL, &ctx->flags))
err = omap_sham_finish(req);
} else {
ctx->flags |= BIT(FLAGS_ERROR);
@@ -666,14 +666,14 @@
spin_lock_irqsave(&dd->lock, flags);
if (req)
ret = ahash_enqueue_request(&dd->queue, req);
- if (dd->flags & BIT(FLAGS_BUSY)) {
+ if (test_bit(FLAGS_BUSY, &dd->flags)) {
spin_unlock_irqrestore(&dd->lock, flags);
return ret;
}
backlog = crypto_get_backlog(&dd->queue);
async_req = crypto_dequeue_request(&dd->queue);
if (async_req)
- dd->flags |= BIT(FLAGS_BUSY);
+ set_bit(FLAGS_BUSY, &dd->flags);
spin_unlock_irqrestore(&dd->lock, flags);
if (!async_req)
@@ -1037,13 +1037,10 @@
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
int ready = 0, err = 0;
- if (ctx->flags & BIT(FLAGS_OUTPUT_READY)) {
- ctx->flags &= ~BIT(FLAGS_OUTPUT_READY);
+ if (test_and_clear_bit(FLAGS_OUTPUT_READY, &ctx->flags))
ready = 1;
- }
- if (dd->flags & BIT(FLAGS_DMA_ACTIVE)) {
- dd->flags &= ~BIT(FLAGS_DMA_ACTIVE);
+ if (test_and_clear_bit(FLAGS_DMA_ACTIVE, &dd->flags)) {
omap_sham_update_dma_stop(dd);
if (!dd->err)
err = omap_sham_update_dma_start(dd);
@@ -1077,7 +1074,7 @@
return IRQ_HANDLED;
}
- if (unlikely(ctx->flags & BIT(FLAGS_FINAL)))
+ if (unlikely(test_bit(FLAGS_FINAL, &ctx->flags)))
/* final -> allow device to go to power-saving mode */
omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
@@ -1085,7 +1082,7 @@
SHA_REG_CTRL_OUTPUT_READY);
omap_sham_read(dd, SHA_REG_CTRL);
- ctx->flags |= BIT(FLAGS_OUTPUT_READY);
+ set_bit(FLAGS_OUTPUT_READY, &ctx->flags);
dd->err = 0;
tasklet_schedule(&dd->done_task);
@@ -1099,7 +1096,7 @@
if (ch_status != OMAP_DMA_BLOCK_IRQ) {
pr_err("omap-sham DMA error status: 0x%hx\n", ch_status);
dd->err = -EIO;
- dd->flags &= ~BIT(FLAGS_INIT); /* request to re-initialize */
+ clear_bit(FLAGS_INIT, &dd->flags);/* request to re-initialize */
}
tasklet_schedule(&dd->done_task);