[PATCH 5.15 001/121] net: wwan: iosm: remove pointless null check

Greg Kroah-Hartman
2022-09-13T14:52:06Z

From: Jakub Kicinski <kuba@kernel.org>

commit dbbc7d04c549a43ad343c69e17b27a57e2102041 upstream.

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>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c | 10 ----------
1 file changed, 10 deletions(-)

--- 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 i
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;

@@ -401,14 +399,6 @@ struct sk_buff *ipc_protocol_dl_td_proce
ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
skb = NULL;
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) {