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authorDan Williams <dan.j.williams@intel.com>2009-01-19 14:39:10 -0700
committerDan Williams <dan.j.williams@intel.com>2009-01-19 14:39:10 -0700
commit83436a0560e9ef8af2f0796264dde4bed1415359 (patch)
treeec195673813725fbfc49c6e56689682b162f42d4 /drivers/dma
parent169d5f663759ec494aa74a552ce99486235e6e50 (diff)
downloadop-kernel-dev-83436a0560e9ef8af2f0796264dde4bed1415359.zip
op-kernel-dev-83436a0560e9ef8af2f0796264dde4bed1415359.tar.gz
dmaengine: kill some dubious WARN_ONCEs
dma_find_channel and dma_issue_pending_all are good places to warn about improper api usage. However, warning correctly means synchronizing with dma_list_mutex, i.e. too much overhead for these fast-path calls. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dmaengine.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 6df144a..a589930 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -329,9 +329,6 @@ struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type)
struct dma_chan *chan;
int cpu;
- WARN_ONCE(dmaengine_ref_count == 0,
- "client called %s without a reference", __func__);
-
cpu = get_cpu();
chan = per_cpu_ptr(channel_table[tx_type], cpu)->chan;
put_cpu();
@@ -348,9 +345,6 @@ void dma_issue_pending_all(void)
struct dma_device *device;
struct dma_chan *chan;
- WARN_ONCE(dmaengine_ref_count == 0,
- "client called %s without a reference", __func__);
-
rcu_read_lock();
list_for_each_entry_rcu(device, &dma_device_list, global_node) {
if (dma_has_cap(DMA_PRIVATE, device->cap_mask))
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