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Subject[PATCH 4/6] staging: ozwpan: Drop oldest ISOC frame instead of dropping latest.
Date
In case of ISOC transfer, if TX queue is full then we start
dropping latest frame, instead we should drop oldest frame &
add latest frame to TX queue.

Signed-off-by: Rupesh Gujare <rupesh.gujare@atmel.com>
---
drivers/staging/ozwpan/ozpd.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/ozwpan/ozpd.c b/drivers/staging/ozwpan/ozpd.c
index 86876bd..17fd7b2 100644
--- a/drivers/staging/ozwpan/ozpd.c
+++ b/drivers/staging/ozwpan/ozpd.c
@@ -844,9 +844,20 @@ int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, const u8 *data, int len)
struct oz_tx_frame *isoc_unit = NULL;
int nb = pd->nb_queued_isoc_frames;
if (nb >= pd->isoc_latency) {
+ struct list_head *e;
+ struct oz_tx_frame *f;
oz_dbg(TX_FRAMES, "Dropping ISOC Unit nb= %d\n",
nb);
- goto out;
+ spin_lock(&pd->tx_frame_lock);
+ list_for_each(e, &pd->tx_queue) {
+ f = container_of(e, struct oz_tx_frame,
+ link);
+ if (f->skb != NULL) {
+ oz_tx_isoc_free(pd, f);
+ break;
+ }
+ }
+ spin_unlock(&pd->tx_frame_lock);
}
isoc_unit = oz_tx_frame_alloc(pd);
if (isoc_unit == NULL)
--
1.7.9.5


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