linux-kernel - Re: [PATCH 2/2] vhost/scsi: Delete error messages for failed memory allocations in five functions

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Message-ID: <20170522094320.GE12205@stefanha-x1.localdomain>
Date:   Mon, 22 May 2017 10:43:20 +0100
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     kvm@...r.kernel.org, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH 2/2] vhost/scsi: Delete error messages for failed memory
 allocations in five functions

On Sat, May 20, 2017 at 04:32:17PM +0200, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 20 May 2017 15:50:30 +0200
> 
> Omit seven extra messages for memory allocation failures in these functions.
> 
> This issue was detected by using the Coccinelle software.
> 
> Link: http://events.linuxfoundation.org/sites/events/files/slides/LCJ16-Refactor_Strings-WSang_0.pdf

Please include an actual explanation for this change instead of linking
to slides.  Why are you trying to get rid of memory allocation failure
messages?

> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/vhost/scsi.c | 24 +++++++-----------------
>  1 file changed, 7 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
> index 650533916c19..49d07950e2e5 100644
> --- a/drivers/vhost/scsi.c
> +++ b/drivers/vhost/scsi.c
> @@ -417,5 +417,4 @@ vhost_scsi_allocate_evt(struct vhost_scsi *vs,
>  	if (!evt) {
> -		vq_err(vq, "Failed to allocate vhost_scsi_evt\n");

#define vq_err(vq, fmt, ...) do {                                  \
                pr_debug(pr_fmt(fmt), ##__VA_ARGS__);       \
                if ((vq)->error_ctx)                               \
                                eventfd_signal((vq)->error_ctx, 1);\
        } while (0)

You silently dropped the eventfd_signal() call.  Please explain.

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