Re: [PATCH v2] ipmi:bt-bmc: Fix error handling and status check

[Tang Bin]

Hi, Corey:

On 2020/4/19 14:29, Tang Bin wrote:
> Hi, Corey:
>
> On 2020/4/18 21:49, Corey Minyard wrote:
> > On Sat, Apr 18, 2020 at 04:02:29PM +0800, Tang Bin wrote:
> > > If the function platform_get_irq() failed, the negative
> > > value returned will not be detected here. So fix error
> > > handling in bt_bmc_config_irq(). And if devm_request_irq()
> > > failed, 'bt_bmc->irq' is assigned to zero maybe redundant,
> > > it may be more suitable for using the correct negative values
> > > to make the status check in the function bt_bmc_remove().
> > You need to mention changing platform_get_irq to
> > platform_get_irq_optional in the header.
> >
> > Another comment inline below.
> >
> > Otherwise, this looks good.
>
> Got it. The v3 will be as followsï
>
> If the function platform_get_irq() failed, the negative value
>
> returned will not be detected here. So fix error handling in
>
> bt_bmc_config_irq(). And in the function bt_bmc_probe(),
>
> when get irq failed, it will print error message. So use
>
> platform_get_irq_optional() to simplify code. Finally in the
>
> function bt_bmc_remove() should make the right status
>
> check if get irq failed.
>
> > You need to set this to rc. Otherwise it will remain the interrupt
> > number assigned by platform_get_irq_optional().
>
> Yes, I think you are right. I'm not as considerate as you. Thank you 
> for your instruction.
>
> When get irq failed, the 'bt_bmc->irq' is negative; when request irq 
> failed, the 'bt_bmc->irq = 0' is right.
>
> So 'bt_bmc->irq <= 0' means irq failed.
>
> Now let me rearrange the logic here:
>
> ÂÂÂ In bt_bmc_probe():
>
> ÂÂÂ ÂÂÂ bt_bmc_config_irq(bt_bmc, pdev);
>
> ÂÂ ÂÂ Â if (bt_bmc->irq > 0) {
>
> ÂÂÂ ÂÂÂ }
>
>
> ÂÂÂ In bt_bmc_remove():
>
> ÂÂÂ ÂÂÂ if (bt_bmc->irq <= 0)
> ÂÂÂ ÂÂÂ ÂÂÂ del_timer_sync(&bt_bmc->poll_timer);
>
>
> If you think this logic is correct, I'll submit v3.
I know you're very busy, and you have handed me a lot before, so I 
should wait for your reply.

But I don't know whether my above logic is correct, so I take the 
liberty to write this email to you. I just wanted to say sorry for 
disturbing you.

Thanks,

Tang Bin