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tipc: allocate user memory with GFP_KERNEL flag
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Until now, we allocate memory always with GFP_ATOMIC flag.
When the system is under memory pressure and a user tries to send,
the send fails due to low memory. However, the user application
can wait for free memory if we allocate it using GFP_KERNEL flag.

In this commit, we use allocate memory with GFP_KERNEL for all user
allocation.

Reported-by: Rune Torgersen <[email protected]>
Acked-by: Jon Maloy <[email protected]>
Signed-off-by: Parthasarathy Bhuvaragan <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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@davem330
Parthasarathy Bhuvaragan authored and davem330 committed Jan 16, 2017
1 parent 34c55cf commit 57d5f64
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Showing 5 changed files with 13 additions and 13 deletions.
4 changes: 2 additions & 2 deletions net/tipc/discover.c
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Original file line number Diff line number Diff line change
Expand Up @@ -169,7 +169,7 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,

/* Send response, if necessary */
if (respond && (mtyp == DSC_REQ_MSG)) {
rskb = tipc_buf_acquire(MAX_H_SIZE);
rskb = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC);
if (!rskb)
return;
tipc_disc_init_msg(net, rskb, DSC_RESP_MSG, bearer);
Expand Down Expand Up @@ -278,7 +278,7 @@ int tipc_disc_create(struct net *net, struct tipc_bearer *b,
req = kmalloc(sizeof(*req), GFP_ATOMIC);
if (!req)
return -ENOMEM;
req->buf = tipc_buf_acquire(MAX_H_SIZE);
req->buf = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC);
if (!req->buf) {
kfree(req);
return -ENOMEM;
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2 changes: 1 addition & 1 deletion net/tipc/link.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1395,7 +1395,7 @@ void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
msg_set_seqno(hdr, seqno++);
pktlen = msg_size(hdr);
msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE);
tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC);
if (!tnlskb) {
pr_warn("%sunable to send packet\n", link_co_err);
return;
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16 changes: 8 additions & 8 deletions net/tipc/msg.c
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Original file line number Diff line number Diff line change
Expand Up @@ -58,12 +58,12 @@ static unsigned int align(unsigned int i)
* NOTE: Headroom is reserved to allow prepending of a data link header.
* There may also be unrequested tailroom present at the buffer's end.
*/
struct sk_buff *tipc_buf_acquire(u32 size)
struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp)
{
struct sk_buff *skb;
unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;

skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
skb = alloc_skb_fclone(buf_size, gfp);
if (skb) {
skb_reserve(skb, BUF_HEADROOM);
skb_put(skb, size);
Expand Down Expand Up @@ -95,7 +95,7 @@ struct sk_buff *tipc_msg_create(uint user, uint type,
struct tipc_msg *msg;
struct sk_buff *buf;

buf = tipc_buf_acquire(hdr_sz + data_sz);
buf = tipc_buf_acquire(hdr_sz + data_sz, GFP_ATOMIC);
if (unlikely(!buf))
return NULL;

Expand Down Expand Up @@ -261,7 +261,7 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,

/* No fragmentation needed? */
if (likely(msz <= pktmax)) {
skb = tipc_buf_acquire(msz);
skb = tipc_buf_acquire(msz, GFP_KERNEL);
if (unlikely(!skb))
return -ENOMEM;
skb_orphan(skb);
Expand All @@ -282,7 +282,7 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
msg_set_importance(&pkthdr, msg_importance(mhdr));

/* Prepare first fragment */
skb = tipc_buf_acquire(pktmax);
skb = tipc_buf_acquire(pktmax, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_orphan(skb);
Expand Down Expand Up @@ -313,7 +313,7 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
pktsz = drem + INT_H_SIZE;
else
pktsz = pktmax;
skb = tipc_buf_acquire(pktsz);
skb = tipc_buf_acquire(pktsz, GFP_KERNEL);
if (!skb) {
rc = -ENOMEM;
goto error;
Expand Down Expand Up @@ -448,7 +448,7 @@ bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
if (msz > (max / 2))
return false;

_skb = tipc_buf_acquire(max);
_skb = tipc_buf_acquire(max, GFP_ATOMIC);
if (!_skb)
return false;

Expand Down Expand Up @@ -496,7 +496,7 @@ bool tipc_msg_reverse(u32 own_node, struct sk_buff **skb, int err)

/* Never return SHORT header; expand by replacing buffer if necessary */
if (msg_short(hdr)) {
*skb = tipc_buf_acquire(BASIC_H_SIZE + dlen);
*skb = tipc_buf_acquire(BASIC_H_SIZE + dlen, GFP_ATOMIC);
if (!*skb)
goto exit;
memcpy((*skb)->data + BASIC_H_SIZE, msg_data(hdr), dlen);
Expand Down
2 changes: 1 addition & 1 deletion net/tipc/msg.h
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Original file line number Diff line number Diff line change
Expand Up @@ -820,7 +820,7 @@ static inline bool msg_is_reset(struct tipc_msg *hdr)
return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
}

struct sk_buff *tipc_buf_acquire(u32 size);
struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
bool tipc_msg_validate(struct sk_buff *skb);
bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
Expand Down
2 changes: 1 addition & 1 deletion net/tipc/name_distr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,7 @@ static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size,
u32 dest)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size);
struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC);
struct tipc_msg *msg;

if (buf != NULL) {
Expand Down

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