linux-kernel - Re: [PATCH] scsi: qedi: return via va_end to match corresponding va

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Date:   Thu, 22 Dec 2016 08:51:13 +0000
From:   "Rangankar, Manish" <Manish.Rangankar@...ium.com>
To:     Colin King <colin.king@...onical.com>,
        Dept-Eng QLogic Storage Upstream 
        <QLogic-Storage-Upstream@...ium.com>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: qedi: return via va_end to match corresponding
 va_start



On 16/12/16 7:40 PM, "Colin King" <colin.king@...onical.com> wrote:

>From: Colin Ian King <colin.king@...onical.com>
>
>Although on most systems va_end is a no-op, it is good practice
>to use va_end on the function return path, especially since the
>va_start documenation states:
>
>  "Each invocation of va_start() must be matched by a corresponding
>   invocation of va_end() in the same function."
>
>Found with static analysis by CoverityScan, CIDs 1389477-1389479
>
>Signed-off-by: Colin Ian King <colin.king@...onical.com>
>---
> drivers/scsi/qedi/qedi_dbg.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
>diff --git a/drivers/scsi/qedi/qedi_dbg.c b/drivers/scsi/qedi/qedi_dbg.c
>index 2bdedb9..8fd28b0 100644
>--- a/drivers/scsi/qedi/qedi_dbg.c
>+++ b/drivers/scsi/qedi/qedi_dbg.c
>@@ -52,7 +52,7 @@ qedi_dbg_warn(struct qedi_dbg_ctx *qedi, const char
>*func, u32 line,
> 	vaf.va = &va;
> 
> 	if (!(qedi_dbg_log & QEDI_LOG_WARN))
>-		return;
>+		goto ret;
> 
> 	if (likely(qedi) && likely(qedi->pdev))
> 		pr_warn("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
>@@ -60,6 +60,7 @@ qedi_dbg_warn(struct qedi_dbg_ctx *qedi, const char
>*func, u32 line,
> 	else
> 		pr_warn("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
> 
>+ret:
> 	va_end(va);
> }
> 
>@@ -80,7 +81,7 @@ qedi_dbg_notice(struct qedi_dbg_ctx *qedi, const char
>*func, u32 line,
> 	vaf.va = &va;
> 
> 	if (!(qedi_dbg_log & QEDI_LOG_NOTICE))
>-		return;
>+		goto ret;
> 
> 	if (likely(qedi) && likely(qedi->pdev))
> 		pr_notice("[%s]:[%s:%d]:%d: %pV",
>@@ -89,6 +90,7 @@ qedi_dbg_notice(struct qedi_dbg_ctx *qedi, const char
>*func, u32 line,
> 	else
> 		pr_notice("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
> 
>+ret:
> 	va_end(va);
> }
> 
>@@ -109,7 +111,7 @@ qedi_dbg_info(struct qedi_dbg_ctx *qedi, const char
>*func, u32 line,
> 	vaf.va = &va;
> 
> 	if (!(qedi_dbg_log & level))
>-		return;
>+		goto ret;
> 
> 	if (likely(qedi) && likely(qedi->pdev))
> 		pr_info("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
>@@ -117,6 +119,7 @@ qedi_dbg_info(struct qedi_dbg_ctx *qedi, const char
>*func, u32 line,
> 	else
> 		pr_info("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
> 
>+ret:
> 	va_end(va);
> }
> 
>-- 
>2.10.2


Acked-by: Manish Rangankar <manish.rangankar@...ium.com>