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From: Thomas Monjalon <thomas@monjalon.net>
To: Elena Agostini <eagostini@nvidia.com>
Cc: dev@dpdk.org
Subject: Re: [PATCH v3] gpudev: manage NULL pointer
Date: Mon, 22 Nov 2021 12:51:46 +0100
Message-ID: <4322799.Gvt5RlC7if@thomas> (raw)
In-Reply-To: <CH2PR12MB410474F4B3B064D1CF10D50CCD9F9@CH2PR12MB4104.namprd12.prod.outlook.com>

22/11/2021 12:34, Elena Agostini:
> From: Thomas Monjalon <thomas@monjalon.net>
> > 22/11/2021 19:24, eagostini@nvidia.com:
> > > --- a/lib/gpudev/gpudev.c
> > > +++ b/lib/gpudev/gpudev.c
> > > @@ -569,6 +569,9 @@ rte_gpu_mem_free(int16_t dev_id, void *ptr)
> > >  {
> > >       struct rte_gpu *dev;
> > >
> > > +     if (ptr == NULL)
> > > +             return 0;
> > > +
> > >       dev = gpu_get_by_id(dev_id);
> > >       if (dev == NULL) {
> > >               GPU_LOG(ERR, "free mem for invalid device ID %d", dev_id);>
> 
> > I think we should keep this check first.
> 
> Why should gpudev waste more latency in looking for the device if the ptr is NULL?

Freeing with NULL pointer is not in the datapath I think,
probably just a failure cleanup case.
Having the dev_id check first allows to catch more bugs.
Returning 0 without checking the id looks weird to me.




  reply	other threads:[~2021-11-22 11:51 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-18 19:28 [PATCH v1] gpudev: return EINVAL if invalid input pointer for free and unregister eagostini
2021-11-18 16:20 ` Stephen Hemminger
2021-11-18 16:22   ` Elena Agostini
2021-11-18 20:19 ` Tyler Retzlaff
2021-11-19  9:34   ` Ferruh Yigit
2021-11-19  9:56     ` Thomas Monjalon
2021-11-24 17:24       ` Tyler Retzlaff
2021-11-24 18:04         ` Bruce Richardson
2021-12-01 21:37           ` Tyler Retzlaff
2021-12-02  7:18             ` Thomas Monjalon
2021-12-02 12:33               ` Morten Brørup
2021-12-02 13:01                 ` Ananyev, Konstantin
2021-12-02 13:56                   ` Morten Brørup
2021-12-03 10:37                     ` Morten Brørup
2021-12-08 17:34                       ` Tyler Retzlaff
2021-12-08 18:40                         ` Morten Brørup
2021-12-09 19:43                           ` Tyler Retzlaff
2021-12-08 17:27                   ` Tyler Retzlaff
2021-11-19 10:15     ` Bruce Richardson
2021-11-18 20:33 ` [PATCH v2] gpudev: free and unregister return gracefully if input pointer is NULL eagostini
2021-11-22 18:24   ` [PATCH v3] gpudev: manage NULL pointer eagostini
2021-11-22 11:23     ` Thomas Monjalon
2021-11-22 11:34       ` Elena Agostini
2021-11-22 11:51         ` Thomas Monjalon [this message]
2021-11-22 23:52 ` [PATCH v4] " eagostini
2021-11-22 23:55 ` [PATCH v5] " eagostini
2021-11-22 16:01   ` Thomas Monjalon
2021-11-23  0:15 ` [PATCH v6] " eagostini
2021-11-23  0:42 ` [PATCH v7] " eagostini
2021-11-24  8:40   ` Thomas Monjalon

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