NFC: Add tx skb allocation routine

This is a factorization of the current rawsock tx skb allocation routine,
as it will be used by the LLCP code.
We also rename nfc_alloc_skb to nfc_alloc_recv_skb for consistency sake.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 34 insertions, 10 deletions

diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index dbf214ef7321..ea1caaeed13c 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -1368,7 +1368,7 @@ static int pn533_data_exchange(struct nfc_dev *nfc_dev, u32 target_idx,
                         PN533_CMD_DATAEXCH_DATA_MAXLEN +
                         PN533_FRAME_TAIL_SIZE;
 
-        skb_resp = nfc_alloc_skb(skb_resp_len, GFP_KERNEL);
+        skb_resp = nfc_alloc_recv_skb(skb_resp_len, GFP_KERNEL);
         if (!skb_resp) {
                 rc = -ENOMEM;
                 goto error;
diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h
index 6a7f602aa841..3a3304c094d7 100644
--- a/include/net/nfc/nfc.h
+++ b/include/net/nfc/nfc.h
@@ -157,7 +157,10 @@ static inline const char *nfc_device_name(struct nfc_dev *dev)
         return dev_name(&dev->dev);
 }
 
-struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp);
+struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
+                                        unsigned int flags, unsigned int size,
+                                        unsigned int *err);
+struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
 
 int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
                                                         int ntargets);
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 2a838b099d82..f53f88ada687 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -27,6 +27,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/nfc.h>
 
 #include "nfc.h"
 
@@ -275,12 +276,35 @@ error:
 }
 
 /**
- * nfc_alloc_skb - allocate a skb for data exchange responses
+ * nfc_alloc_send_skb - allocate a skb for data exchange responses
  *
  * @size: size to allocate
  * @gfp: gfp flags
  */
-struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp)
+struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
+                                        unsigned int flags, unsigned int size,
+                                        unsigned int *err)
+{
+        struct sk_buff *skb;
+        unsigned int total_size;
+
+        total_size = size +
+                dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
+
+        skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
+        if (skb)
+                skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
+
+        return skb;
+}
+
+/**
+ * nfc_alloc_recv_skb - allocate a skb for data exchange responses
+ *
+ * @size: size to allocate
+ * @gfp: gfp flags
+ */
+struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
 {
         struct sk_buff *skb;
         unsigned int total_size;
@@ -293,7 +317,7 @@ struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp)
 
         return skb;
 }
-EXPORT_SYMBOL(nfc_alloc_skb);
+EXPORT_SYMBOL(nfc_alloc_recv_skb);
 
 /**
  * nfc_targets_found - inform that targets were found
diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c
index 5e9b991eac13..11ac0a17156e 100644
--- a/net/nfc/rawsock.c
+++ b/net/nfc/rawsock.c
@@ -208,13 +208,10 @@ static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
         if (sock->state != SS_CONNECTED)
                 return -ENOTCONN;
 
-        skb = sock_alloc_send_skb(sk, len + dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE,
-                                        msg->msg_flags & MSG_DONTWAIT, &rc);
-        if (!skb)
+        skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
+        if (skb == NULL)
                 return rc;
 
-        skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
-
         rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
         if (rc < 0) {
                 kfree_skb(skb);