Subject: Re: [PATCH net v3 3/6] octeontx2-pf: handle otx2_mbox_get_rsp errors in otx2_flows.c

From: Simon Horman <[email-masked]>
Date: Tue, 8 Oct 2024 14:20:44 +0100

On Sun, Oct 06, 2024 at 04:43:21PM +0000, Dipendra Khadka wrote:
> Adding error pointer check after calling otx2_mbox_get_rsp().
> 
> Fixes: 9917060fc30a ("octeontx2-pf: Cleanup flow rule management")
> Fixes: f0a1913f8a6f ("octeontx2-pf: Add support for ethtool ntuple filters")
> Fixes: 674b3e164238 ("octeontx2-pf: Add additional checks while configuring ucast/bcast/mcast rules")
> Signed-off-by: Dipendra Khadka <[email-masked]>
> ---
> v3:
>  - Included in the patch set
>  - Changed patch subject
>  - Added Fixes: tag
> v2: https://lore.kernel.org/all/[email-masked]/
>  - Changed the subject to net
>  - Changed the typo of the vairable from bfvp to pfvf
> v1: https://lore.kernel.org/all/[email-masked]/
>  .../net/ethernet/marvell/octeontx2/nic/otx2_flows.c  | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
> index 98c31a16c70b..c96f115995f8 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
> @@ -119,6 +119,10 @@ int otx2_alloc_mcam_entries(struct otx2_nic *pfvf, u16 count)
> 
>  		rsp = (struct npc_mcam_alloc_entry_rsp *)otx2_mbox_get_rsp
>  			(&pfvf->mbox.mbox, 0, &req->hdr);
> +		if (IS_ERR(rsp)) {
> +			allocated = PTR_ERR(rsp);
> +			goto exit;

This does not seem consistent with other error handling within the same
loop. I'm unsure if it is correct, but my reading that the current approach
is:

		if (IS_ERR(rsp))
			goto exit;

> +		}
> 
>  		for (ent = 0; ent < rsp->count; ent++)
>  			flow_cfg->flow_ent[ent + allocated] = rsp->entry_list[ent];

...