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| author | Eric Dumazet <edumazet@google.com> | 2017-01-19 06:44:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-05 15:40:22 +0300 |
| commit | 83571e9ef7c91ef6e249aae374de068b30963551 (patch) | |
| tree | 67228161bc9d8a7aaab4016b240ef63d309d7cd5 /drivers/net | |
| parent | c48a862c47d481838b26f5d6cd5c29e2064339da (diff) | |
| download | linux-83571e9ef7c91ef6e249aae374de068b30963551.tar.xz | |
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/net')
| -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 d391beebe591..3f4e71148808 100644 --- a/drivers/net/ethernet/freescale/gianfar.c +++ b/drivers/net/ethernet/freescale/gianfar.c @@ -2951,7 +2951,7 @@ static bool gfar_add_rx_frag(struct gfar_rx_buff *rxb, u32 lstatus, } /* 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 */ |