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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx

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* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx:
  fsldma: Fix compile warnings
  fsldma: fix memory leak on error path in fsl_dma_prep_memcpy()
  fsldma: snooping is not enabled for last entry in descriptor chain
  fsldma: fix infinite loop on multi-descriptor DMA chain completion
  fsldma: fix "DMA halt timeout!" errors
  fsldma: fix check on potential fdev->chan[] overflow
  fsldma: update mailling list address in MAINTAINERS
This commit is contained in:
Linus Torvalds 2009-05-30 07:57:33 -07:00
commit 228b60acaa
2 changed files with 48 additions and 25 deletions
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2
MAINTAINERS
View file

@ -2251,7 +2251,7 @@ P: Li Yang
M: leoli@freescale.com
P: Zhang Wei
M: zw@zh-kernel.org
L: linuxppc-embedded@ozlabs.org
L: linuxppc-dev@ozlabs.org
L: linux-kernel@vger.kernel.org
S: Maintained
F: drivers/dma/fsldma.*

71
drivers/dma/fsldma.c
View file

@ -179,9 +179,14 @@ static void dma_halt(struct fsl_dma_chan *fsl_chan)
static void set_ld_eol(struct fsl_dma_chan *fsl_chan,
struct fsl_desc_sw *desc)
{
u64 snoop_bits;
snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX)
? FSL_DMA_SNEN : 0;
desc->hw.next_ln_addr = CPU_TO_DMA(fsl_chan,
DMA_TO_CPU(fsl_chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL,
64);
DMA_TO_CPU(fsl_chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL
| snoop_bits, 64);
}
static void append_ld_queue(struct fsl_dma_chan *fsl_chan,
@ -313,8 +318,8 @@ static void fsl_chan_toggle_ext_start(struct fsl_dma_chan *fsl_chan, int enable)
static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct fsl_desc_sw *desc = tx_to_fsl_desc(tx);
struct fsl_dma_chan *fsl_chan = to_fsl_chan(tx->chan);
struct fsl_desc_sw *desc;
unsigned long flags;
dma_cookie_t cookie;
@ -322,14 +327,17 @@ static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
spin_lock_irqsave(&fsl_chan->desc_lock, flags);
cookie = fsl_chan->common.cookie;
cookie++;
if (cookie < 0)
cookie = 1;
desc->async_tx.cookie = cookie;
fsl_chan->common.cookie = desc->async_tx.cookie;
list_for_each_entry(desc, &tx->tx_list, node) {
cookie++;
if (cookie < 0)
cookie = 1;
append_ld_queue(fsl_chan, desc);
list_splice_init(&desc->async_tx.tx_list, fsl_chan->ld_queue.prev);
desc->async_tx.cookie = cookie;
}
fsl_chan->common.cookie = cookie;
append_ld_queue(fsl_chan, tx_to_fsl_desc(tx));
list_splice_init(&tx->tx_list, fsl_chan->ld_queue.prev);
spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
@ -454,8 +462,8 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
{
struct fsl_dma_chan *fsl_chan;
struct fsl_desc_sw *first = NULL, *prev = NULL, *new;
struct list_head *list;
size_t copy;
LIST_HEAD(link_chain);
if (!chan)
return NULL;
@ -472,7 +480,7 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
if (!new) {
dev_err(fsl_chan->dev,
"No free memory for link descriptor\n");
return NULL;
goto fail;
}
#ifdef FSL_DMA_LD_DEBUG
dev_dbg(fsl_chan->dev, "new link desc alloc %p\n", new);
@ -507,7 +515,19 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
/* Set End-of-link to the last link descriptor of new list*/
set_ld_eol(fsl_chan, new);
return first ? &first->async_tx : NULL;
return &first->async_tx;
fail:
if (!first)
return NULL;
list = &first->async_tx.tx_list;
list_for_each_entry_safe_reverse(new, prev, list, node) {
list_del(&new->node);
dma_pool_free(fsl_chan->desc_pool, new, new->async_tx.phys);
}
return NULL;
}
/**
@ -598,15 +618,16 @@ static void fsl_chan_xfer_ld_queue(struct fsl_dma_chan *fsl_chan)
dma_addr_t next_dest_addr;
unsigned long flags;
spin_lock_irqsave(&fsl_chan->desc_lock, flags);
if (!dma_is_idle(fsl_chan))
return;
goto out_unlock;
dma_halt(fsl_chan);
/* If there are some link descriptors
* not transfered in queue. We need to start it.
*/
spin_lock_irqsave(&fsl_chan->desc_lock, flags);
/* Find the first un-transfer desciptor */
for (ld_node = fsl_chan->ld_queue.next;
@ -617,19 +638,20 @@ static void fsl_chan_xfer_ld_queue(struct fsl_dma_chan *fsl_chan)
fsl_chan->common.cookie) == DMA_SUCCESS);
ld_node = ld_node->next);
spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
if (ld_node != &fsl_chan->ld_queue) {
/* Get the ld start address from ld_queue */
next_dest_addr = to_fsl_desc(ld_node)->async_tx.phys;
dev_dbg(fsl_chan->dev, "xfer LDs staring from %p\n",
(void *)next_dest_addr);
dev_dbg(fsl_chan->dev, "xfer LDs staring from 0x%llx\n",
(unsigned long long)next_dest_addr);
set_cdar(fsl_chan, next_dest_addr);
dma_start(fsl_chan);
} else {
set_cdar(fsl_chan, 0);
set_ndar(fsl_chan, 0);
}
out_unlock:
spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
}
/**
@ -734,8 +756,9 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
*/
if (stat & FSL_DMA_SR_EOSI) {
dev_dbg(fsl_chan->dev, "event: End-of-segments INT\n");
dev_dbg(fsl_chan->dev, "event: clndar %p, nlndar %p\n",
(void *)get_cdar(fsl_chan), (void *)get_ndar(fsl_chan));
dev_dbg(fsl_chan->dev, "event: clndar 0x%llx, nlndar 0x%llx\n",
(unsigned long long)get_cdar(fsl_chan),
(unsigned long long)get_ndar(fsl_chan));
stat &= ~FSL_DMA_SR_EOSI;
update_cookie = 1;
}
@ -830,7 +853,7 @@ static int __devinit fsl_dma_chan_probe(struct fsl_dma_device *fdev,
new_fsl_chan->reg.end - new_fsl_chan->reg.start + 1);
new_fsl_chan->id = ((new_fsl_chan->reg.start - 0x100) & 0xfff) >> 7;
if (new_fsl_chan->id > FSL_DMA_MAX_CHANS_PER_DEVICE) {
if (new_fsl_chan->id >= FSL_DMA_MAX_CHANS_PER_DEVICE) {
dev_err(fdev->dev, "There is no %d channel!\n",
new_fsl_chan->id);
err = -EINVAL;
@ -925,8 +948,8 @@ static int __devinit of_fsl_dma_probe(struct of_device *dev,
}
dev_info(&dev->dev, "Probe the Freescale DMA driver for %s "
"controller at %p...\n",
match->compatible, (void *)fdev->reg.start);
"controller at 0x%llx...\n",
match->compatible, (unsigned long long)fdev->reg.start);
fdev->reg_base = ioremap(fdev->reg.start, fdev->reg.end
- fdev->reg.start + 1);