linux-kernel - Re: [PATCH v3 1/2] tty: hvc: pass DMA capable memory to put

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Message-ID: <79af3486-4d65-7d3a-2603-f2a90954311f@linux.alibaba.com>
Date:   Thu, 5 Aug 2021 16:23:58 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jirislaby@...nel.org>, amit@...nel.org, arnd@...db.de,
        osandov@...com, linuxppc-dev@...ts.ozlabs.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] tty: hvc: pass DMA capable memory to put_chars()


在 2021/8/5 下午4:18, Greg KH 写道:
> On Thu, Aug 05, 2021 at 04:08:46PM +0800, Xianting Tian wrote:
>> 在 2021/8/5 下午3:58, Jiri Slaby 写道:
>>> Hi,
>>>
>>> On 04. 08. 21, 4:54, Xianting Tian wrote:
>>>> @@ -933,6 +949,16 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno,
>>>> int data,
>>>>        hp->outbuf_size = outbuf_size;
>>>>        hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
>>>>    +    /*
>>>> +     * hvc_con_outbuf is guaranteed to be aligned at least to the
>>>> +     * size(N_OUTBUF) by kmalloc().
>>>> +     */
>>>> +    hp->hvc_con_outbuf = kzalloc(N_OUTBUF, GFP_KERNEL);
>>>> +    if (!hp->hvc_con_outbuf)
>>>> +        return ERR_PTR(-ENOMEM);
>>> This leaks hp, right?
>>>
>>> BTW your 2 patches are still not threaded, that is hard to follow.
>> yes, thanks, I found the bug, I am preparing to do this in v4.
>>
>> It is the first time I send series patches(number >1), I checked the method
>> for sending series patch on LKML.org, I should send '0/2' which is the
>> history info for series patches.
> Please use 'git send-email' to send the full series all at once,
> otherwise it is hard to make the emails threaded "by hand" if you do not
> do so.
I got it, thanks for your guide:)
>
> thanks,
>
> greg k-h