The following commit has been merged in the master branch: commit aeb193ea6cef28e33589de05ef932424f8e19bde Author: Wedson Almeida Filho wedsonaf@gmail.com Date: Sun Jun 23 23:33:48 2013 -0700

net: Unmap fragment page once iterator is done

Callers of skb_seq_read() are currently forced to call skb_abort_seq_read() even when consuming all the data because the last call to skb_seq_read (the one that returns 0 to indicate the end) fails to unmap the last fragment page.

With this patch callers will be allowed to traverse the SKB data by calling skb_prepare_seq_read() once and repeatedly calling skb_seq_read() as originally intended (and documented in the original commit 677e90eda), that is, only call skb_abort_seq_read() if the sequential read is actually aborted.

Signed-off-by: Wedson Almeida Filho wedsonaf@gmail.com Signed-off-by: David S. Miller davem@davemloft.net

diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c index 552e8a2..448eae8 100644 --- a/drivers/scsi/libiscsi_tcp.c +++ b/drivers/scsi/libiscsi_tcp.c @@ -906,7 +906,6 @@ int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n", consumed); *status = ISCSI_TCP_SKB_DONE; - skb_abort_seq_read(&seq); goto skb_done; } BUG_ON(segment->copied >= segment->size); diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 51aafd6..08125f3 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -473,7 +473,6 @@ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) crc = crc32c(crc, data, len); consumed += len; } - skb_abort_seq_read(&st);

return htonl(crc); } diff --git a/net/core/skbuff.c b/net/core/skbuff.c index edf3757..9f73eca 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2541,8 +2541,13 @@ unsigned int skb_seq_read(unsigned int consumed, const u8 **data, unsigned int block_limit, abs_offset = consumed + st->lower_offset; skb_frag_t *frag;

- if (unlikely(abs_offset >= st->upper_offset)) + if (unlikely(abs_offset >= st->upper_offset)) { + if (st->frag_data) { + kunmap_atomic(st->frag_data); + st->frag_data = NULL; + } return 0; + }

next_skb: block_limit = skb_headlen(st->cur_skb) + st->stepped_offset;