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DaVinci: EDMA: Fix Bug while obtaining contiguous params 

The reserve_contiguous_params function is used to reserve
a set of contiguous PARAMs. If we do not find a complete
set of contiguous PARAMs, the functions still has to free
every PARAM that it found to be free in the process of finding a
complete set and thus marked as "in use".
This patch mainly deals with correctly handling the
freeing of PARAMs.

Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Sandeep Paulraj 2009-09-20 13:47:03 -04:00 committed by Kevin Hilman
parent dc4c05a513
commit cc93fc3f34
1 changed files with 24 additions and 8 deletions
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32
arch/arm/mach-davinci/dma.c
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@ -515,17 +515,30 @@ static int reserve_contiguous_params(int ctlr, unsigned int id,
{
int i, j;
unsigned int count = num_params;
int stop_param = start_param;
DECLARE_BITMAP(tmp_inuse, EDMA_MAX_PARAMENTRY);
for (i = start_param; i < edma_info[ctlr]->num_slots; ++i) {
j = EDMA_CHAN_SLOT(i);
if (!test_and_set_bit(j, edma_info[ctlr]->edma_inuse))
if (!test_and_set_bit(j, edma_info[ctlr]->edma_inuse)) {
/* Record our current beginning slot */
if (count == num_params)
stop_param = i;
count--;
set_bit(j, tmp_inuse);
if (count == 0)
break;
else if (id == EDMA_CONT_PARAMS_FIXED_EXACT)
break;
else
count = num_params;
} else {
clear_bit(j, tmp_inuse);
if (id == EDMA_CONT_PARAMS_FIXED_EXACT) {
stop_param = i;
break;
} else
count = num_params;
}
}
/*
@ -534,12 +547,15 @@ static int reserve_contiguous_params(int ctlr, unsigned int id,
* of contiguous parameter RAMs but do not find the exact number
* requested as we may reach the total number of parameter RAMs
*/
if (count) {
for (j = i - num_params + count + 1; j <= i ; ++j)
if (i == edma_info[ctlr]->num_slots)
stop_param = i;
for (j = start_param; j < stop_param; j++)
if (test_bit(j, tmp_inuse))
clear_bit(j, edma_info[ctlr]->edma_inuse);
if (count)
return -EBUSY;
}
for (j = i - num_params + 1; j <= i; ++j)
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(j),