diff options
| author | Mugunthan V N <mugunthanvnm@ti.com> | 2014-04-10 10:53:23 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-04-11 22:27:41 +0200 |
| commit | 16e5c57da61cda26998bee91a327960ebd1562f6 (patch) | |
| tree | 71a4aa3204905180200bfb0c49cd290036d65c87 /drivers | |
| parent | net: Fix use after free by removing length arg from sk_data_ready callbacks. (diff) | |
| download | linux-16e5c57da61cda26998bee91a327960ebd1562f6.tar.xz linux-16e5c57da61cda26998bee91a327960ebd1562f6.zip | |
drivers: net: cpsw: discard all packets received when interface is down
When the Ethernet interface is brought down during high Ethernet traffic,
then cpsw creates the following warn dump. When cpdma has already processed
the packet then the status will be greater than 0, so the cpsw_rx_handler
considers that the interface is up and try to resubmit one more rx buffer
to cpdma which fails as the DMA is in teardown process. This can be avoided
by checking the interface state and then process the received packet, if the
interface is down just discard and free the skb and return.
[ 2823.104591] WARNING: CPU: 0 PID: 1823 at drivers/net/ethernet/ti/cpsw.c:711 cpsw_rx_handler+0x148/0x164()
[ 2823.114654] Modules linked in:
[ 2823.117872] CPU: 0 PID: 1823 Comm: ifconfig Tainted: G W 3.14.0-11992-gf34c4a3 #11
[ 2823.126860] [<c0014b5c>] (unwind_backtrace) from [<c00117e4>] (show_stack+0x10/0x14)
[ 2823.135030] [<c00117e4>] (show_stack) from [<c0533a9c>] (dump_stack+0x80/0x9c)
[ 2823.142619] [<c0533a9c>] (dump_stack) from [<c003f0e0>] (warn_slowpath_common+0x6c/0x90)
[ 2823.151141] [<c003f0e0>] (warn_slowpath_common) from [<c003f120>] (warn_slowpath_null+0x1c/0x24)
[ 2823.160336] [<c003f120>] (warn_slowpath_null) from [<c03caeb0>] (cpsw_rx_handler+0x148/0x164)
[ 2823.169314] [<c03caeb0>] (cpsw_rx_handler) from [<c03c730c>] (__cpdma_chan_free+0x90/0xa8)
[ 2823.178028] [<c03c730c>] (__cpdma_chan_free) from [<c03c7418>] (__cpdma_chan_process+0xf4/0x134)
[ 2823.187279] [<c03c7418>] (__cpdma_chan_process) from [<c03c7560>] (cpdma_chan_stop+0xb4/0x17c)
[ 2823.196349] [<c03c7560>] (cpdma_chan_stop) from [<c03c766c>] (cpdma_ctlr_stop+0x44/0x9c)
[ 2823.204872] [<c03c766c>] (cpdma_ctlr_stop) from [<c03cb708>] (cpsw_ndo_stop+0x154/0x188)
[ 2823.213321] [<c03cb708>] (cpsw_ndo_stop) from [<c046f0ec>] (__dev_close_many+0x84/0xc8)
[ 2823.221761] [<c046f0ec>] (__dev_close_many) from [<c046f158>] (__dev_close+0x28/0x3c)
[ 2823.230012] [<c046f158>] (__dev_close) from [<c0474ca8>] (__dev_change_flags+0x88/0x160)
[ 2823.238483] [<c0474ca8>] (__dev_change_flags) from [<c0474da0>] (dev_change_flags+0x18/0x48)
[ 2823.247316] [<c0474da0>] (dev_change_flags) from [<c04d12c4>] (devinet_ioctl+0x61c/0x6e0)
[ 2823.255884] [<c04d12c4>] (devinet_ioctl) from [<c045c660>] (sock_ioctl+0x68/0x2a4)
[ 2823.263789] [<c045c660>] (sock_ioctl) from [<c0125fe4>] (do_vfs_ioctl+0x78/0x61c)
[ 2823.271629] [<c0125fe4>] (do_vfs_ioctl) from [<c01265ec>] (SyS_ioctl+0x64/0x74)
[ 2823.279284] [<c01265ec>] (SyS_ioctl) from [<c000e580>] (ret_fast_syscall+0x0/0x48)
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/ti/cpsw.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 6133e4af9975..4e3d197ce55a 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -687,7 +687,7 @@ static void cpsw_rx_handler(void *token, int len, int status) cpsw_dual_emac_src_port_detect(status, priv, ndev, skb); - if (unlikely(status < 0)) { + if (unlikely(status < 0) || unlikely(!netif_running(ndev))) { /* the interface is going down, skbs are purged */ dev_kfree_skb_any(skb); return; |