[PATCH v2] drivers/net/ethernet/intel/e100: check the return value of e100_exec_cmd()

[PATCH v2] drivers/net/ethernet/intel/e100: check the return value of e100_exec_cmd()

[Li Zhong]

Check the return value of e100_exec_cmd() which could return error code
when execution fails.

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
---
 drivers/net/ethernet/intel/e100.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 11a884aa5082..0d133cd4d01b 100644
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -1911,7 +1911,9 @@ static inline void e100_start_receiver(struct nic *nic, struct rx *rx)
 
 	/* (Re)start RU if suspended or idle and RFA is non-NULL */
 	if (rx->skb) {
-		e100_exec_cmd(nic, ruc_start, rx->dma_addr);
+		if (e100_exec_cmd(nic, ruc_start, rx->dma_addr))
+			netif_printk(nic, tx_err, KERN_DEBUG, nic->netdev,
+			     "exec ruc_start failed\n");
 		nic->ru_running = RU_RUNNING;
 	}
 }
-- 
2.25.1

Re: [PATCH v2] drivers/net/ethernet/intel/e100: check the return value of e100_exec_cmd()

[Jakub Kicinski]

On Fri, 16 Sep 2022 17:10:27 -0700 Li Zhong wrote:
> Check the return value of e100_exec_cmd() which could return error code
> when execution fails.

You need to provide more detailed analysis in the commit message.
Right now it looks like you're just blindly finding cases where
return value is not checked and adding error checks. This is as
likely to fix something as it is to break.