diff options
Diffstat (limited to 'drivers/dma/sh/shdma-base.c')
-rw-r--r-- | drivers/dma/sh/shdma-base.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c index f75ebfa735c0..73db282a1436 100644 --- a/drivers/dma/sh/shdma-base.c +++ b/drivers/dma/sh/shdma-base.c @@ -76,7 +76,6 @@ static dma_cookie_t shdma_tx_submit(struct dma_async_tx_descriptor *tx) container_of(tx, struct shdma_desc, async_tx), *last = desc; struct shdma_chan *schan = to_shdma_chan(tx->chan); - struct shdma_slave *slave = schan->slave; dma_async_tx_callback callback = tx->callback; dma_cookie_t cookie; bool power_up; @@ -138,7 +137,7 @@ static dma_cookie_t shdma_tx_submit(struct dma_async_tx_descriptor *tx) * Make it int then, on error remove chunks from the * queue again */ - ops->setup_xfer(schan, slave); + ops->setup_xfer(schan, schan->slave_id); if (schan->pm_state == SHDMA_PM_PENDING) shdma_chan_xfer_ld_queue(schan); @@ -186,7 +185,7 @@ static int shdma_alloc_chan_resources(struct dma_chan *chan) * never runs concurrently with itself or free_chan_resources. */ if (slave) { - if (slave->slave_id >= slave_num) { + if (slave->slave_id < 0 || slave->slave_id >= slave_num) { ret = -EINVAL; goto evalid; } @@ -196,9 +195,13 @@ static int shdma_alloc_chan_resources(struct dma_chan *chan) goto etestused; } - ret = ops->set_slave(schan, slave); + ret = ops->set_slave(schan, slave->slave_id); if (ret < 0) goto esetslave; + + schan->slave_id = slave->slave_id; + } else { + schan->slave_id = -EINVAL; } schan->desc = kcalloc(NR_DESCS_PER_CHANNEL, @@ -208,7 +211,6 @@ static int shdma_alloc_chan_resources(struct dma_chan *chan) goto edescalloc; } schan->desc_num = NR_DESCS_PER_CHANNEL; - schan->slave = slave; for (i = 0; i < NR_DESCS_PER_CHANNEL; i++) { desc = ops->embedded_desc(schan->desc, i); @@ -366,10 +368,9 @@ static void shdma_free_chan_resources(struct dma_chan *chan) if (!list_empty(&schan->ld_queue)) shdma_chan_ld_cleanup(schan, true); - if (schan->slave) { + if (schan->slave_id >= 0) { /* The caller is holding dma_list_mutex */ - struct shdma_slave *slave = schan->slave; - clear_bit(slave->slave_id, shdma_slave_used); + clear_bit(schan->slave_id, shdma_slave_used); chan->private = NULL; } @@ -559,7 +560,7 @@ static struct dma_async_tx_descriptor *shdma_prep_slave_sg( struct shdma_chan *schan = to_shdma_chan(chan); struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); const struct shdma_ops *ops = sdev->ops; - struct shdma_slave *slave = schan->slave; + int slave_id = schan->slave_id; dma_addr_t slave_addr; if (!chan) @@ -568,9 +569,9 @@ static struct dma_async_tx_descriptor *shdma_prep_slave_sg( BUG_ON(!schan->desc_num); /* Someone calling slave DMA on a generic channel? */ - if (!slave || !sg_len) { - dev_warn(schan->dev, "%s: bad parameter: %p, %d, %d\n", - __func__, slave, sg_len, slave ? slave->slave_id : -1); + if (slave_id < 0 || !sg_len) { + dev_warn(schan->dev, "%s: bad parameter: len=%d, id=%d\n", + __func__, sg_len, slave_id); return NULL; } |