diff options
| author | Eric Dumazet <edumazet@google.com> | 2017-01-18 19:44:42 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-05 14:37:18 +0200 |
| commit | 961efcd54e5be36326d809a5b3c934c022e5b024 (patch) | |
| tree | c6814ad96084b854a250addc94907c54448e90c9 /drivers | |
| parent | 477a2359c881e0ce4c4039cf28669de07e269fa5 (diff) | |
gianfar: Do not reuse pages from emergency reserve
[ Upstream commit 69fed99baac186013840ced3524562841296034f ]
A driver using dev_alloc_page() must not reuse a page that had to
use emergency memory reserve.
Otherwise all packets using this page will be immediately dropped,
unless for very specific sockets having SOCK_MEMALLOC bit set.
This issue might be hard to debug, because only a fraction of the RX
ring buffer would suffer from drops.
Fixes: 75354148ce69 ("gianfar: Add paged allocation and Rx S/G")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Claudiu Manoil <claudiu.manoil@freescale.com>
Acked-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/freescale/gianfar.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c index 6a061f17a44f..4cd2a7d0124f 100644 --- a/drivers/net/ethernet/freescale/gianfar.c +++ b/drivers/net/ethernet/freescale/gianfar.c @@ -2939,7 +2939,7 @@ static bool gfar_add_rx_frag(struct gfar_rx_buff *rxb, u32 lstatus, size, GFAR_RXB_TRUESIZE); /* try reuse page */ - if (unlikely(page_count(page) != 1)) + if (unlikely(page_count(page) != 1 || page_is_pfmemalloc(page))) return false; /* change offset to the other half */ |