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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>
This commit is contained in:
Richard Röjfors 2010-03-26 08:23:58 +01:00 committed by Dan Williams
parent de5d4453c5
commit 0f65169b1b
1 changed files with 5 additions and 2 deletions
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7
drivers/dma/timb_dma.c
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@ -79,7 +79,10 @@ struct timb_dma_desc {
struct timb_dma_chan {
struct dma_chan chan;
void __iomem *membase;
spinlock_t lock; /* Used for mutual exclusion */
spinlock_t lock; /* Used to protect data structures,
especially the lists and descriptors,
from races between the tasklet and calls
from above */
dma_cookie_t last_completed_cookie;
bool ongoing;
struct list_head active_list;
@ -197,7 +200,7 @@ static int td_fill_desc(struct timb_dma_chan *td_chan, u8 *dma_desc,
}
dev_dbg(chan2dev(&td_chan->chan), "desc: %p, addr: %p\n",
dma_desc, (void *)(int)sg_dma_address(sg));
dma_desc, (void *)sg_dma_address(sg));
dma_desc[7] = (sg_dma_address(sg) >> 24) & 0xff;
dma_desc[6] = (sg_dma_address(sg) >> 16) & 0xff;