gigaset: fix bad assumptions about CAPI skbuffs

The CAPI interface incorrectly assumed that CAPI messages would always
start at the beginning of the data buffer: fix by treating DATA_B3
messages as the link layer header to their payload data. This fix
changes the way acknowledgement information is propagated through the
hardware specific modules and thereby impacts the ISDN4Linux variant
of the driver, too.

Also some assumptions about methods not being called from interrupt
context turned out to be unwarranted; fix by using dev_kfree_skb_any()
wherever non-interrupt context isn't guaranteed.

Impact: bugfix
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/isdn/gigaset/isocdata.c b/drivers/isdn/gigaset/isocdata.c
index 7dabfd35874c..bc41611e541d 100644
--- a/drivers/isdn/gigaset/isocdata.c
+++ b/drivers/isdn/gigaset/isocdata.c
@@ -576,12 +576,12 @@ static inline void hdlc_done(struct bc_state *bcs)
                 dev_notice(cs->dev, "received short frame (%d octets)\n",
                            procskb->len);
                 bcs->hw.bas->runts++;
-                dev_kfree_skb(procskb);
+                dev_kfree_skb_any(procskb);
                 gigaset_isdn_rcv_err(bcs);
         } else if (bcs->fcs != PPP_GOODFCS) {
                 dev_notice(cs->dev, "frame check error (0x%04x)\n", bcs->fcs);
                 bcs->hw.bas->fcserrs++;
-                dev_kfree_skb(procskb);
+                dev_kfree_skb_any(procskb);
                 gigaset_isdn_rcv_err(bcs);
         } else {
                 len = procskb->len;
@@ -985,7 +985,7 @@ void gigaset_isoc_input(struct inbuf_t *inbuf)
  * Called by LL to queue an skb for sending, and start transmission if
  * necessary.
  * Once the payload data has been transmitted completely, gigaset_skb_sent()
- * will be called with the first cs->hw_hdr_len bytes of skb->head preserved.
+ * will be called with the skb's link layer header preserved.
  *
  * Return value:
  *      number of bytes accepted for sending (skb->len) if ok,