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dmaengine: xgene-dma: Fix the lock to allow client for further submission of requests

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This patch provides the fix in the cleanup routing such that client can perform
further submission by releasing the lock before calling client's callback function.

Signed-off-by: Rameshwar Prasad Sahu <rsahu@apm.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Rameshwar Prasad Sahu 2015-08-21 14:33:34 +05:30 committed by Vinod Koul
parent 64f1d0ffba
commit 005ce70b94
1 changed files with 22 additions and 11 deletions
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33
drivers/dma/xgene-dma.c
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@ -763,12 +763,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
struct xgene_dma_ring *ring = &chan->rx_ring;
struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
struct xgene_dma_desc_hw *desc_hw;
struct list_head ld_completed;
u8 status;
INIT_LIST_HEAD(&ld_completed);
spin_lock_bh(&chan->lock);
/* Clean already completed and acked descriptors */
xgene_dma_clean_completed_descriptor(chan);
/* Run the callback for each descriptor, in order */
/* Move all completed descriptors to ld completed queue, in order */
list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
/* Get subsequent hw descriptor from DMA rx ring */
desc_hw = &ring->desc_hw[ring->head];
@ -811,15 +816,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
/* Mark this hw descriptor as processed */
desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
xgene_dma_run_tx_complete_actions(chan, desc_sw);
xgene_dma_clean_running_descriptor(chan, desc_sw);
/*
* Decrement the pending transaction count
* as we have processed one
*/
chan->pending--;
/*
* Delete this node from ld running queue and append it to
* ld completed queue for further processing
*/
list_move_tail(&desc_sw->node, &ld_completed);
}
/*
@ -828,6 +835,14 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
* ahead and free the descriptors below.
*/
xgene_chan_xfer_ld_pending(chan);
spin_unlock_bh(&chan->lock);
/* Run the callback for each descriptor, in order */
list_for_each_entry_safe(desc_sw, _desc_sw, &ld_completed, node) {
xgene_dma_run_tx_complete_actions(chan, desc_sw);
xgene_dma_clean_running_descriptor(chan, desc_sw);
}
}
static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
@ -876,11 +891,11 @@ static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
if (!chan->desc_pool)
return;
spin_lock_bh(&chan->lock);
/* Process all running descriptor */
xgene_dma_cleanup_descriptors(chan);
spin_lock_bh(&chan->lock);
/* Clean all link descriptor queues */
xgene_dma_free_desc_list(chan, &chan->ld_pending);
xgene_dma_free_desc_list(chan, &chan->ld_running);
@ -1200,15 +1215,11 @@ static void xgene_dma_tasklet_cb(unsigned long data)
{
struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data;
spin_lock_bh(&chan->lock);
/* Run all cleanup for descriptors which have been completed */
xgene_dma_cleanup_descriptors(chan);
/* Re-enable DMA channel IRQ */
enable_irq(chan->rx_irq);
spin_unlock_bh(&chan->lock);
}
static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)