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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-28 12:35:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-28 12:35:15 -0700
commit4cb865deec59ef31d966622d1ec87411ae32dfab (patch)
treee060d515f62e4f334aded38c9079485d50166693 /drivers/dma/ioat
parent55f08e1baa3ef11c952b626dbc7ef9e3e8332a63 (diff)
parent19d78a61be6dd707dcec298c486303d4ba2c840a (diff)
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (33 commits) x86: poll waiting for I/OAT DMA channel status maintainers: add dma engine tree details dmaengine: add TODO items for future work on dma drivers dmaengine: Add API documentation for slave dma usage dmaengine/dw_dmac: Update maintainer-ship dmaengine: move link order dmaengine/dw_dmac: implement pause and resume in dwc_control dmaengine/dw_dmac: Replace spin_lock* with irqsave variants and enable submission from callback dmaengine/dw_dmac: Divide one sg to many desc, if sg len is greater than DWC_MAX_COUNT dmaengine/dw_dmac: set residue as total len in dwc_tx_status if status is !DMA_SUCCESS dmaengine/dw_dmac: don't call callback routine in case dmaengine_terminate_all() is called dmaengine: at_hdmac: pause: no need to wait for FIFO empty pch_dma: modify pci device table definition pch_dma: Support new device ML7223 IOH pch_dma: Support I2S for ML7213 IOH pch_dma: Fix DMA setting issue pch_dma: modify for checkpatch pch_dma: fix dma direction issue for ML7213 IOH video-in dmaengine: at_hdmac: use descriptor chaining help function dmaengine: at_hdmac: implement pause and resume in atc_control ... Fix up trivial conflict in drivers/dma/dw_dmac.c
Diffstat (limited to 'drivers/dma/ioat')
-rw-r--r--drivers/dma/ioat/dma_v2.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c
index f4a51d4d034..5d65f837797 100644
--- a/drivers/dma/ioat/dma_v2.c
+++ b/drivers/dma/ioat/dma_v2.c
@@ -508,6 +508,7 @@ int ioat2_alloc_chan_resources(struct dma_chan *c)
struct ioat_ring_ent **ring;
u64 status;
int order;
+ int i = 0;
/* have we already been set up? */
if (ioat->ring)
@@ -548,8 +549,11 @@ int ioat2_alloc_chan_resources(struct dma_chan *c)
ioat2_start_null_desc(ioat);
/* check that we got off the ground */
- udelay(5);
- status = ioat_chansts(chan);
+ do {
+ udelay(1);
+ status = ioat_chansts(chan);
+ } while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status));
+
if (is_ioat_active(status) || is_ioat_idle(status)) {
set_bit(IOAT_RUN, &chan->state);
return 1 << ioat->alloc_order;