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staging: ozwpan: Drop oldest ISOC frame instead of dropping latest.

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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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rupesh Gujare 2013-08-01 18:40:03 +01:00 committed by Greg Kroah-Hartman
parent 4d6c9e5702
commit 2dc2ee5ccd
1 changed files with 12 additions and 1 deletions
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13
drivers/staging/ozwpan/ozpd.c
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@ -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; struct oz_tx_frame *isoc_unit = NULL;
int nb = pd->nb_queued_isoc_frames; int nb = pd->nb_queued_isoc_frames;
if (nb >= pd->isoc_latency) { if (nb >= pd->isoc_latency) {
struct list_head *e;
struct oz_tx_frame *f;
oz_dbg(TX_FRAMES, "Dropping ISOC Unit nb= %d\n", oz_dbg(TX_FRAMES, "Dropping ISOC Unit nb= %d\n",
nb); 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); isoc_unit = oz_tx_frame_alloc(pd);
if (isoc_unit == NULL) if (isoc_unit == NULL)