rt2x00: Sequence counter should be protected in irqsave

The sequence counter can be accessed in IRQ context,
which means the lock protecting the counter should
be irqsave. To prevent making the entire intf->lock irqsave
without reason, create a new lock which only protects
the sequence counter.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index 3b27f6aa860c..898cdd7f57d9 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -128,6 +128,7 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
         unsigned int data_length;
         unsigned int duration;
         unsigned int residual;
+        unsigned long irqflags;
 
         memset(txdesc, 0, sizeof(*txdesc));
 
@@ -213,14 +214,14 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
          * sequence counter given by mac80211.
          */
         if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
-                spin_lock(&intf->lock);
+                spin_lock_irqsave(&intf->seqlock, irqflags);
 
                 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
                         intf->seqno += 0x10;
                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
                 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
 
-                spin_unlock(&intf->lock);
+                spin_unlock_irqrestore(&intf->seqlock, irqflags);
 
                 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
         }