linux-kernel - Re: [SCSI] fix media change events for polled devices

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Date:	Fri, 21 Mar 2008 17:10:40 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Kay Sievers <kay.sievers@...y.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-scsi@...r.kernel.org
Subject: Re: [SCSI] fix media change events for polled devices

James Bottomley wrote:
> On Fri, 2008-03-21 at 16:42 -0400, Jeff Garzik wrote:
>> Kay Sievers wrote:
>>> On Fri, 2008-03-21 at 13:12 -0400, Jeff Garzik wrote:
>>>> Linux Kernel Mailing List wrote:
>>>>>     [SCSI] fix media change events for polled devices
>>>>>     
>>>>>     Commit:
>>>>>       a341cd0f (SCSI: add asynchronous event notification API)
>>>>>     breaks:
>>>>>       285e9670 (sr,sd: send media state change modification events)
>>>>>     by introducing an event filter, which is removed here, to make
>>>>>     events, we are depending on, happen again.
>>>> By simply reading the code history, it is trivial to verify that this 
>>>> description is false:
>>>>
>>>> Commit 285e9670 depends on a341cd0f, so by definition it is 285e9670 -- 
>>>> or rather the incomplete update of your original patch that resulted in 
>>>> 285e9670 -- that is broken.
>>> It worked fine with Kristen's patches, and that's where it is coming
>>> from from.
>> Neither her patches nor yours went upstream verbatim at version one. 
>> You need to look at what happens upstream, not what happened in your 
>> private testing six months ago.
>>
>>
>>> You mean the read-only sysfs attribute? :)
>> I mean the attribute with both 'show' (read) and 'store' (write) 
>> functions.  The perms do need to change, thanks for noticing that bug.
> 
> That's not a bug.

Yes, it is.  That sysfs node was intended to be writable.


> For starters, we have transport classes that provide generic store
> methods but can't pass the information on to drivers.  For these, we set
> the attribute to read only even if there is a store method.  Even if
> that weren't the case, how do you know which of UGO wants the write
> setting?

You give it to root, and let userspace change it after that, like we 
always do.

	Jeff



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