dma: timb-dma: Update comment and fix compiler warning
An incremental patch which clarifies what the spinlock is used for and fixes a compiler warning. Signed-off-by: Richard Röjfors <richard.rojfors@pelagicore.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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@ -79,7 +79,10 @@ struct timb_dma_desc {
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struct timb_dma_chan {
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struct dma_chan chan;
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void __iomem *membase;
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spinlock_t lock; /* Used for mutual exclusion */
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spinlock_t lock; /* Used to protect data structures,
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especially the lists and descriptors,
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from races between the tasklet and calls
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from above */
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dma_cookie_t last_completed_cookie;
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bool ongoing;
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struct list_head active_list;
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@ -197,7 +200,7 @@ static int td_fill_desc(struct timb_dma_chan *td_chan, u8 *dma_desc,
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}
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dev_dbg(chan2dev(&td_chan->chan), "desc: %p, addr: %p\n",
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dma_desc, (void *)(int)sg_dma_address(sg));
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dma_desc, (void *)sg_dma_address(sg));
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dma_desc[7] = (sg_dma_address(sg) >> 24) & 0xff;
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dma_desc[6] = (sg_dma_address(sg) >> 16) & 0xff;
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