linux-kernel - Re: [PATCH] mhi_bus: core: Return EBUSY if MHI ring is full

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Message-ID: <CAMZdPi-s5kXcPZftCv-VfRK7VpGT9_1TREO8GNTC3rwpU8RHpQ@mail.gmail.com>
Date:   Wed, 17 Feb 2021 17:14:34 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Hemant Kumar <hemantk@...eaurora.org>,
        Bhaumik Bhatt <bbhatt@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Fan Wu <wufan@...eaurora.org>
Subject: Re: [PATCH] mhi_bus: core: Return EBUSY if MHI ring is full

On Wed, 17 Feb 2021 at 16:06, Jeffrey Hugo <jhugo@...eaurora.org> wrote:
>
> On 2/17/2021 8:02 AM, Loic Poulain wrote:
> > On Tue, 16 Feb 2021 at 19:50, Jeffrey Hugo <jhugo@...eaurora.org> wrote:
> >>
> >> From: Fan Wu <wufan@...eaurora.org>
> >>
> >> Currently ENOMEM is returned when MHI ring is full. This error code is
> >> very misleading. Change to EBUSY instead.
> >
> > Well, there is no space left in the ring, so it's no so misleading.
>
> ENOMEM is typically a memory allocation failure which is not what a
> client is going to think of regarding the ring, and it's not a unique
> failure code in this case.  gen_tre can also return ENOMEM, which makes
> it difficult for the client to know if there is some significant
> failure, or they might just need to wait (assuming that is something the
> client can do).

Yes, fair enough, I overlooked the other thread, -EAGAIN would indeed
make sense.

Regards,
Loic