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From: Jakub Kicinski <kuba@kernel.org>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com,
	Jakub Kicinski <kuba@kernel.org>,
	m.chetan.kumar@intel.com, linuxwwan@intel.com,
	loic.poulain@linaro.org, ryazanov.s.a@gmail.com,
	johannes@sipsolutions.net
Subject: [PATCH net-next] net: wwan: iosm: remove pointless null check
Date: Wed, 18 May 2022 17:43:42 -0700	[thread overview]
Message-ID: <20220519004342.2109832-1-kuba@kernel.org> (raw)

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.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
CC: m.chetan.kumar@intel.com
CC: linuxwwan@intel.com
CC: loic.poulain@linaro.org
CC: ryazanov.s.a@gmail.com
CC: johannes@sipsolutions.net
---
 drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c b/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c
index c6b032f95d2e..4627847c6daa 100644
--- 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);
-- 
2.34.3


             reply	other threads:[~2022-05-19  0:43 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-19  0:43 Jakub Kicinski [this message]
2022-05-19  7:12 ` Kumar, M Chetan
2022-05-20  1:50 ` patchwork-bot+netdevbpf

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