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yaml --- r: 105073 b: refs/heads/master c: 5eb907a h: refs/heads/master i: 105071: ab9c340 v: v3
git-mirror · Jul 18, 2008 · 0c8631d · 0c8631d
1 parent f21fcba
commit 0c8631d
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Showing 2 changed files with 11 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c7141d005a19d2a0a316b3bf9c170d3bedf07bfd
+refs/heads/master: 5eb907aaaf7a316a0097ff9f8c21bf9fc468a1f1
diff --git a/trunk/drivers/dma/iop-adma.c b/trunk/drivers/dma/iop-adma.c
@@ -450,7 +450,16 @@ iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
 
-/* returns the number of allocated descriptors */
+/**
+ * iop_adma_alloc_chan_resources -  returns the number of allocated descriptors
+ * @chan - allocate descriptor resources for this channel
+ * @client - current client requesting the channel be ready for requests
+ *
+ * Note: We keep the slots for 1 operation on iop_chan->chain at all times.  To
+ * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
+ * greater than 2x the number slots needed to satisfy a device->max_xor
+ * request.
+ * */
 static int iop_adma_alloc_chan_resources(struct dma_chan *chan,
 					 struct dma_client *client)
 {