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net: ipa: use IDs for last allocated transaction

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Use the allocated and free transaction IDs to determine whether the
"last" transaction used for quiescing a channel is in allocated
state.  The last allocated transaction that has not been committed
(if any) immediately precedes the first free transaction in the
transaction array.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder
2022-09-02 16:02:14 -05:00
committed by David S. Miller
parent b2abe33d23
commit c30623ea0b
1 changed files with 9 additions and 3 deletions
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drivers/net/ipa/gsi.c
+9 -3
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@@ -711,6 +711,8 @@ static struct gsi_trans *gsi_channel_trans_last(struct gsi_channel *channel)
{
struct gsi_trans_info *trans_info = &channel->trans_info;
struct gsi_trans *trans;
u16 trans_index;
u16 trans_id;
spin_lock_bh(&trans_info->spinlock);
@@ -718,10 +720,14 @@ static struct gsi_trans *gsi_channel_trans_last(struct gsi_channel *channel)
* before we disabled transmits, so check for that.
*/
if (channel->toward_ipa) {
trans = list_last_entry_or_null(&trans_info->alloc,
struct gsi_trans, links);
if (trans)
/* The last allocated transaction precedes the first free */
if (trans_info->allocated_id != trans_info->free_id) {
trans_id = trans_info->free_id - 1;
trans_index = trans_id % channel->tre_count;
trans = &trans_info->trans[trans_index];
goto done;
}
trans = list_last_entry_or_null(&trans_info->committed,
struct gsi_trans, links);
if (trans)