[PATCH 4.19 043/321] net/fq_impl: Switch to kvmalloc() for memory allocation

Greg Kroah-Hartman
2019-12-03T22:48:12Z

From: Toke Høiland-Jørgensen <toke@redhat.com>

[ Upstream commit 71e67c3bd127cfe7863f54e4b087eba1cc8f9a7a ]

The FQ implementation used by mac80211 allocates memory using kmalloc(),
which can fail; and Johannes reported that this actually happens in
practice.

To avoid this, switch the allocation to kvmalloc() instead; this also
brings fq_impl in line with all the FQ qdiscs.

Fixes: 557fc4a09803 ("fq: add fair queuing framework")
Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20191105155750.547379-1-toke@redhat.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/fq_impl.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/net/fq_impl.h b/include/net/fq_impl.h
index 89a012905ef0b..4b3e18ff8e6f2 100644
--- a/include/net/fq_impl.h
+++ b/include/net/fq_impl.h
@@ -312,7 +312,7 @@ static int fq_init(struct fq *fq, int flows_cnt)
fq->limit = 8192;
fq->memory_limit = 16 << 20; /* 16 MBytes */

- fq->flows = kcalloc(fq->flows_cnt, sizeof(fq->flows[0]), GFP_KERNEL);
+ fq->flows = kvcalloc(fq->flows_cnt, sizeof(fq->flows[0]), GFP_KERNEL);
if (!fq->flows)
return -ENOMEM;

@@ -330,7 +330,7 @@ static void fq_reset(struct fq *fq,
for (i = 0; i < fq->flows_cnt; i++)
fq_flow_reset(fq, &fq->flows[i], free_func);

- kfree(fq->flows);
+ kvfree(fq->flows);
fq->flows = NULL;
}

--
2.20.1