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| author | Dmitry Bogdanov <dmitry.bogdanov@aquantia.com> | 2019-08-30 15:08:38 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-21 08:17:10 +0300 |
| commit | 83360eb798cadc85de08db3f2219dfc656ff2a49 (patch) | |
| tree | 7cd11e794523d88ef82c5949fdffc3c306b55b57 /drivers | |
| parent | 30c345bd786abe5db70711dbd3f5fceb5ca4d36c (diff) | |
| download | linux-83360eb798cadc85de08db3f2219dfc656ff2a49.tar.xz | |
net: aquantia: fix out of memory condition on rx side
[ Upstream commit be6cef69ba570ebb327eba1ef6438f7af49aaf86 ]
On embedded environments with hard memory limits it is a normal although
rare case when skb can't be allocated on rx part under high traffic.
In such OOM cases napi_complete_done() was not called.
So the napi object became in an invalid state like it is "scheduled".
Kernel do not re-schedules the poll of that napi object.
Consequently, kernel can not remove that object the system hangs on
`ifconfig down` waiting for a poll.
We are fixing this by gracefully closing napi poll routine with correct
invocation of napi_complete_done.
This was reproduced with artificially failing the allocation of skb to
simulate an "out of memory" error case and check that traffic does
not get stuck.
Fixes: 970a2e9864b0 ("net: ethernet: aquantia: Vector operations")
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/aquantia/atlantic/aq_vec.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_vec.c b/drivers/net/ethernet/aquantia/atlantic/aq_vec.c index d335c334fa56..82582fa54d5d 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_vec.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_vec.c @@ -89,6 +89,7 @@ static int aq_vec_poll(struct napi_struct *napi, int budget) } } +err_exit: if (!was_tx_cleaned) work_done = budget; @@ -98,7 +99,7 @@ static int aq_vec_poll(struct napi_struct *napi, int budget) 1U << self->aq_ring_param.vec_idx); } } -err_exit: + return work_done; } |