net: wwan: iosm: remove pointless null check

GCC 12 warns:

drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c: In function ‘ipc_protocol_dl_td_process’:
drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c:406:13: warning: the comparison will always evaluate as ‘true’ for the address of ‘cb’ will never be NULL [-Waddress]
  406 |         if (!IPC_CB(skb)) {
      |             ^

Indeed the check seems entirely pointless. Hopefully the other
validation checks will catch if the cb is bad, but it can't be
NULL.

Reviewed-by: M Chetan Kumar <m.chetan.kumar@intel.com>
Link: https://lore.kernel.org/r/20220519004342.2109832-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c b/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c
index c6b032f..4627847 100644 (file)
--- a/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c
@@ -372,8 +372,6 @@ bool ipc_protocol_dl_td_prepare(struct iosm_protocol *ipc_protocol,
 struct sk_buff *ipc_protocol_dl_td_process(struct iosm_protocol *ipc_protocol,
                                           struct ipc_pipe *pipe)
 {
-       u32 tail =
-               le32_to_cpu(ipc_protocol->p_ap_shm->tail_array[pipe->pipe_nr]);
        struct ipc_protocol_td *p_td;
        struct sk_buff *skb;
 
@@ -403,14 +401,6 @@ struct sk_buff *ipc_protocol_dl_td_process(struct iosm_protocol *ipc_protocol,
                goto ret;
        }
 
-       if (!IPC_CB(skb)) {
-               dev_err(ipc_protocol->dev, "pipe# %d, tail: %d skb_cb is NULL",
-                       pipe->pipe_nr, tail);
-               ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
-               skb = NULL;
-               goto ret;
-       }
-
        if (p_td->buffer.address != IPC_CB(skb)->mapping) {
                dev_err(ipc_protocol->dev, "invalid buf=%llx or skb=%p",
                        (unsigned long long)p_td->buffer.address, skb->data);