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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2010-02-10 17:32:38 +0100
committerDan Williams <dan.j.williams@intel.com>2010-02-10 12:01:06 -0700
commit8f98781e0f15207b6ab33bee1fae05428be0475b (patch)
tree31830720fd57bd11191e85bbdc98eaefe061f127 /drivers/dma
parentb953df7c70740cd7593072ebec77a8f658505630 (diff)
downloadlwn-8f98781e0f15207b6ab33bee1fae05428be0475b.tar.gz
lwn-8f98781e0f15207b6ab33bee1fae05428be0475b.zip
async-tx: fix buffer submission error handling in ipu_idma.c
If submitting new buffer failed, a wrong descriptor gets completed and it doesn't check, if a callback is at all defined, which can lead to an Oops. Fix these bugs and make ipu_update_channel_buffer() void, because it never fails. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/ipu/ipu_idmac.c25
1 files changed, 7 insertions, 18 deletions
diff --git a/drivers/dma/ipu/ipu_idmac.c b/drivers/dma/ipu/ipu_idmac.c
index 9a5bc1a7389e..e80bae1673fa 100644
--- a/drivers/dma/ipu/ipu_idmac.c
+++ b/drivers/dma/ipu/ipu_idmac.c
@@ -761,12 +761,10 @@ static void ipu_select_buffer(enum ipu_channel channel, int buffer_n)
* @buffer_n: buffer number to update.
* 0 or 1 are the only valid values.
* @phyaddr: buffer physical address.
- * @return: Returns 0 on success or negative error code on failure. This
- * function will fail if the buffer is set to ready.
*/
/* Called under spin_lock(_irqsave)(&ichan->lock) */
-static int ipu_update_channel_buffer(struct idmac_channel *ichan,
- int buffer_n, dma_addr_t phyaddr)
+static void ipu_update_channel_buffer(struct idmac_channel *ichan,
+ int buffer_n, dma_addr_t phyaddr)
{
enum ipu_channel channel = ichan->dma_chan.chan_id;
uint32_t reg;
@@ -806,8 +804,6 @@ static int ipu_update_channel_buffer(struct idmac_channel *ichan,
}
spin_unlock_irqrestore(&ipu_data.lock, flags);
-
- return 0;
}
/* Called under spin_lock_irqsave(&ichan->lock) */
@@ -816,7 +812,6 @@ static int ipu_submit_buffer(struct idmac_channel *ichan,
{
unsigned int chan_id = ichan->dma_chan.chan_id;
struct device *dev = &ichan->dma_chan.dev->device;
- int ret;
if (async_tx_test_ack(&desc->txd))
return -EINTR;
@@ -827,14 +822,7 @@ static int ipu_submit_buffer(struct idmac_channel *ichan,
* could make it conditional on status >= IPU_CHANNEL_ENABLED, but
* doing it again shouldn't hurt either.
*/
- ret = ipu_update_channel_buffer(ichan, buf_idx,
- sg_dma_address(sg));
-
- if (ret < 0) {
- dev_err(dev, "Updating sg %p on channel 0x%x buffer %d failed!\n",
- sg, chan_id, buf_idx);
- return ret;
- }
+ ipu_update_channel_buffer(ichan, buf_idx, sg_dma_address(sg));
ipu_select_buffer(chan_id, buf_idx);
dev_dbg(dev, "Updated sg %p on channel 0x%x buffer %d\n",
@@ -1379,10 +1367,11 @@ static irqreturn_t idmac_interrupt(int irq, void *dev_id)
if (likely(sgnew) &&
ipu_submit_buffer(ichan, descnew, sgnew, ichan->active_buffer) < 0) {
- callback = desc->txd.callback;
- callback_param = desc->txd.callback_param;
+ callback = descnew->txd.callback;
+ callback_param = descnew->txd.callback_param;
spin_unlock(&ichan->lock);
- callback(callback_param);
+ if (callback)
+ callback(callback_param);
spin_lock(&ichan->lock);
}