From: David Daney <ddaney@caviumnetworks.com>
Date: Wed, 5 May 2010 13:03:09 +0000 (+0000)
Subject: netdev: octeon_mgmt: Fix race condition freeing TX buffers.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4d30b8013b2d82138d6900965fe9fcd062f2d06d;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

netdev: octeon_mgmt: Fix race condition freeing TX buffers.

Under heavy load the TX cleanup tasklet and xmit threads would race
and try to free too many buffers.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/octeon/octeon_mgmt.c b/drivers/net/octeon/octeon_mgmt.c
index bbbd737210f..b975a2fad95 100644
--- a/drivers/net/octeon/octeon_mgmt.c
+++ b/drivers/net/octeon/octeon_mgmt.c
@@ -189,12 +189,19 @@ static void octeon_mgmt_clean_tx_buffers(struct octeon_mgmt *p)
 
 	mix_orcnt.u64 = cvmx_read_csr(CVMX_MIXX_ORCNT(port));
 	while (mix_orcnt.s.orcnt) {
+		spin_lock_irqsave(&p->tx_list.lock, flags);
+
+		mix_orcnt.u64 = cvmx_read_csr(CVMX_MIXX_ORCNT(port));
+
+		if (mix_orcnt.s.orcnt == 0) {
+			spin_unlock_irqrestore(&p->tx_list.lock, flags);
+			break;
+		}
+
 		dma_sync_single_for_cpu(p->dev, p->tx_ring_handle,
 					ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
 					DMA_BIDIRECTIONAL);
 
-		spin_lock_irqsave(&p->tx_list.lock, flags);
-
 		re.d64 = p->tx_ring[p->tx_next_clean];
 		p->tx_next_clean =
 			(p->tx_next_clean + 1) % OCTEON_MGMT_TX_RING_SIZE;