set_filter_wr is requesting __GFP_NOFAIL allocation although it can
return ENOMEM without any problems obviously (t4_l2t_set_switching does
that already). So the non-failing requirement is too strong without any
obvious reason. Drop __GFP_NOFAIL and reorganize the code to have the
failure paths easier.
The same applies to _c4iw_write_mem_dma_aligned which uses __GFP_NOFAIL
and then checks the return value and returns -ENOMEM on failure. This
doesn't make any sense what so ever. Either the allocation cannot fail
or it can.
del_filter_wr seems to be safe as well because the filter entry is not
marked as pending and the return value is propagated up the stack up to
c4iw_destroy_listen.
Signed-off-by: Michal Hocko <mhocko@xxxxxxx>
---
drivers/infiniband/hw/cxgb4/mem.c | 2 +-
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 15 ++++++++++++---
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/hw/cxgb4/mem.c b/drivers/infiniband/hw/cxgb4/mem.c
index cb43c2299ac0..81b028eaf1f5 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -73,7 +73,7 @@ static int _c4iw_write_mem_dma_aligned(struct c4iw_rdev *rdev, u32 addr,
c4iw_init_wr_wait(&wr_wait);
wr_len = roundup(sizeof(*req) + sizeof(*sgl), 16);
- skb = alloc_skb(wr_len, GFP_KERNEL | __GFP_NOFAIL);
+ skb = alloc_skb(wr_len, GFP_KERNEL);
if (!skb)
return -ENOMEM;
set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index ccf3436024bc..f351920fc293 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -1220,6 +1220,10 @@ static int set_filter_wr(struct adapter *adapter, int fidx)
struct fw_filter_wr *fwr;
unsigned int ftid;
+ skb = alloc_skb(sizeof(*fwr), GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
/* If the new filter requires loopback Destination MAC and/or VLAN
* rewriting then we need to allocate a Layer 2 Table (L2T) entry for
* the filter.
@@ -1227,19 +1231,21 @@ static int set_filter_wr(struct adapter *adapter, int fidx)
if (f->fs.newdmac || f->fs.newvlan) {
/* allocate L2T entry for new filter */
f->l2t = t4_l2t_alloc_switching(adapter->l2t);
- if (f->l2t == NULL)
+ if (f->l2t == NULL) {
+ kfree(skb);
return -EAGAIN;
+ }
if (t4_l2t_set_switching(adapter, f->l2t, f->fs.vlan,
f->fs.eport, f->fs.dmac)) {
cxgb4_l2t_release(f->l2t);
f->l2t = NULL;
+ kfree(skb);
return -ENOMEM;
}
}
ftid = adapter->tids.ftid_base + fidx;
- skb = alloc_skb(sizeof(*fwr), GFP_KERNEL | __GFP_NOFAIL);
fwr = (struct fw_filter_wr *)__skb_put(skb, sizeof(*fwr));
memset(fwr, 0, sizeof(*fwr));
@@ -1337,7 +1343,10 @@ static int del_filter_wr(struct adapter *adapter, int fidx)
len = sizeof(*fwr);
ftid = adapter->tids.ftid_base + fidx;
- skb = alloc_skb(len, GFP_KERNEL | __GFP_NOFAIL);
+ skb = alloc_skb(len, GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
fwr = (struct fw_filter_wr *)__skb_put(skb, len);
t4_mk_filtdelwr(ftid, fwr, adapter->sge.fw_evtq.abs_id);
--
2.1.4
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