linux-kernel - [PATCH 4/6] staging: ozwpan: Drop oldest ISOC frame instead of dropping latest.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 1 Aug 2013 18:40:03 +0100
From:	Rupesh Gujare <rupesh.gujare@...el.com>
To:	<devel@...uxdriverproject.org>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<gregkh@...uxfoundation.org>
Subject: [PATCH 4/6] staging: ozwpan: Drop oldest ISOC frame instead of dropping latest.

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@...el.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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/