linux-kernel - Re: [PATCH v2] staging: qlge: fix build breakage with dumping enabled

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Message-ID: <20200827005010.GA46897@f3>
Date:   Thu, 27 Aug 2020 09:50:10 +0900
From:   Benjamin Poirier <benjamin.poirier@...il.com>
To:     Coiby Xu <coiby.xu@...il.com>
Cc:     devel@...verdev.osuosl.org, Manish Chopra <manishc@...vell.com>,
        "supporter:QLOGIC QLGE 10Gb ETHERNET DRIVER" 
        <GR-Linux-NIC-Dev@...vell.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "open list:QLOGIC QLGE 10Gb ETHERNET DRIVER" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] staging: qlge: fix build breakage with dumping enabled

On 2020-08-27 07:27 +0800, Coiby Xu wrote:
> This fixes commit 0107635e15ac
> ("staging: qlge: replace pr_err with netdev_err") which introduced an
> build breakage of missing `struct ql_adapter *qdev` for some functions
> and a warning of type mismatch with dumping enabled, i.e.,
> 
> $ make CFLAGS_MODULE="QL_ALL_DUMP=1 QL_OB_DUMP=1 QL_CB_DUMP=1 \
>   QL_IB_DUMP=1 QL_REG_DUMP=1 QL_DEV_DUMP=1" M=drivers/staging/qlge
> 
> qlge_dbg.c: In function ‘ql_dump_ob_mac_rsp’:
> qlge_dbg.c:2051:13: error: ‘qdev’ undeclared (first use in this function); did you mean ‘cdev’?
>  2051 |  netdev_err(qdev->ndev, "%s\n", __func__);
>       |             ^~~~
> qlge_dbg.c: In function ‘ql_dump_routing_entries’:
> qlge_dbg.c:1435:10: warning: format ‘%s’ expects argument of type ‘char *’, but argument 3 has type ‘int’ [-Wformat=]
>  1435 |        "%s: Routing Mask %d = 0x%.08x\n",
>       |         ~^
>       |          |
>       |          char *
>       |         %d
>  1436 |        i, value);
>       |        ~
>       |        |
>       |        int
> qlge_dbg.c:1435:37: warning: format ‘%x’ expects a matching ‘unsigned int’ argument [-Wformat=]
>  1435 |        "%s: Routing Mask %d = 0x%.08x\n",
>       |                                 ~~~~^
>       |                                     |
>       |                                     unsigned int
> 
> Fixes: 0107635e15ac ("staging: qlge: replace pr_err with netdev_err")
> Reported-by: Benjamin Poirier <benjamin.poirier@...il.com>
> Suggested-by: Benjamin Poirier <benjamin.poirier@...il.com>
> Signed-off-by: Coiby Xu <coiby.xu@...il.com>
> ---
>  drivers/staging/qlge/qlge.h      | 20 ++++++++++----------
>  drivers/staging/qlge/qlge_dbg.c  | 24 ++++++++++++++++++------
>  drivers/staging/qlge/qlge_main.c |  8 ++++----
>  3 files changed, 32 insertions(+), 20 deletions(-)
> 
[...]
> @@ -1632,6 +1635,8 @@ void ql_dump_wqicb(struct wqicb *wqicb)
> 
>  void ql_dump_tx_ring(struct tx_ring *tx_ring)
>  {
> +	struct ql_adapter *qdev = tx_ring->qdev;
> +
>  	if (!tx_ring)
>  		return;

Given the null check for tx_ring, it seems unwise to dereference tx_ring
before the check.

Looking at ql_dump_all(), I'm not sure that the check is needed at all
though. Maybe it should be removed.

Same problem in ql_dump_rx_ring().

>  	netdev_err(qdev->ndev, "===================== Dumping tx_ring %d ===============\n",
> @@ -1657,6 +1662,8 @@ void ql_dump_tx_ring(struct tx_ring *tx_ring)
>  void ql_dump_ricb(struct ricb *ricb)
>  {
>  	int i;
> +	struct ql_adapter *qdev =
> +		container_of(ricb, struct ql_adapter, ricb);

Here, davem would point out that the variables are not declared in
"reverse xmas tree" order.