From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: Jason Wang <jasowang@redhat.com>
Cc: mst <mst@redhat.com>, Wu Zongyong <wuzongyong@linux.alibaba.com>,
Arnd Bergmann <arnd@arndb.de>,
virtualization <virtualization@lists.linux-foundation.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH 1/2] eni_vdpa: Fix an error handling path in 'eni_vdpa_probe()'
Date: Mon, 8 Nov 2021 20:32:14 +0100 [thread overview]
Message-ID: <393fb7b7-653b-eae6-16bd-5ffc7d600619@wanadoo.fr> (raw)
In-Reply-To: <CACGkMEvN0cgFQhJmLF3xDXHt_EyZ-TnfBM8CnpNwA9sKcwpzBg@mail.gmail.com>
Le 08/11/2021 à 06:55, Jason Wang a écrit :
> On Mon, Nov 8, 2021 at 12:15 AM Christophe JAILLET
> <christophe.jaillet@wanadoo.fr> wrote:
>>
>> In the error handling path, a successful 'vp_legacy_probe()' should be
>> balanced by a corresponding 'vp_legacy_remove()' call, as already done in
>> the remove function.
>>
>> Add the missing call and update gotos accordingly.
>>
>> Fixes: e85087beedca ("eni_vdpa: add vDPA driver for Alibaba ENI")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
>> ---
>> drivers/vdpa/alibaba/eni_vdpa.c | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/vdpa/alibaba/eni_vdpa.c b/drivers/vdpa/alibaba/eni_vdpa.c
>> index 3f788794571a..12b3db6b4517 100644
>> --- a/drivers/vdpa/alibaba/eni_vdpa.c
>> +++ b/drivers/vdpa/alibaba/eni_vdpa.c
>> @@ -501,7 +501,7 @@ static int eni_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>> if (!eni_vdpa->vring) {
>> ret = -ENOMEM;
>> ENI_ERR(pdev, "failed to allocate virtqueues\n");
>> - goto err;
>> + goto err_remove_vp_legacy;
>> }
>>
>> for (i = 0; i < eni_vdpa->queues; i++) {
>> @@ -513,11 +513,13 @@ static int eni_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>> ret = vdpa_register_device(&eni_vdpa->vdpa, eni_vdpa->queues);
>> if (ret) {
>> ENI_ERR(pdev, "failed to register to vdpa bus\n");
>> - goto err;
>> + goto err_remove_vp_legacy;
>> }
>>
>> return 0;
>>
>> +err_remove_vp_legacy:
>> + vp_legacy_remove(&eni_vdpa->ldev);
>
> Won't vp_legacy_remove() be triggered by the put_devic() below?
Hi, I'm sorry but i don't see how.
My understanding is that:
- on "put_device(&eni_vdpa->vdpa.dev);", the corresponding release
function will be called.
- This release function is the one recorded in the
'__vdpa_alloc_device()' function.
- So it should be 'vdpa_release_dev()'.
- This function, AFAIU, has no knowledge of 'vp_legacy_remove()' or
anything that could call it.
Unless I misread something or miss something obvious, I don't see how
'vp_legacy_remove() would be called.
Could you elaborate?
CJ
>
> Thanks
>
>> err:
>> put_device(&eni_vdpa->vdpa.dev);
>> return ret;
>> --
>> 2.30.2
>>
>
>
next prev parent reply other threads:[~2021-11-08 19:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-07 16:14 [PATCH 1/2] eni_vdpa: Fix an error handling path in 'eni_vdpa_probe()' Christophe JAILLET
2021-11-07 16:14 ` [PATCH 2/2] eni_vdpa: Simplify 'eni_vdpa_probe()' Christophe JAILLET
2021-11-09 2:56 ` Jason Wang
2021-11-08 5:55 ` [PATCH 1/2] eni_vdpa: Fix an error handling path in 'eni_vdpa_probe()' Jason Wang
2021-11-08 19:32 ` Christophe JAILLET [this message]
2021-11-09 2:54 ` Jason Wang
2021-11-09 21:21 ` Christophe JAILLET
2021-11-24 23:58 ` Michael S. Tsirkin
2021-11-25 6:34 ` Christophe JAILLET
2021-11-25 7:02 ` Michael S. Tsirkin
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