linux-kernel - RE: [PATCH] usb-storage: Optimize scan delay more precisely

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Message-ID:
 <TYVPR01MB10781AA8B37E147E318597B46903B2@TYVPR01MB10781.jpnprd01.prod.outlook.com>
Date: Thu, 28 Mar 2024 03:04:47 +0000
From: Norihiko Hama <norihiko.hama@...salpine.com>
To: Alan Stern <stern@...land.harvard.edu>
CC: Greg KH <gregkh@...uxfoundation.org>, "linux-usb@...r.kernel.org"
	<linux-usb@...r.kernel.org>, "usb-storage@...ts.one-eyed-alien.net"
	<usb-storage@...ts.one-eyed-alien.net>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb-storage: Optimize scan delay more precisely

> On Wed, Mar 27, 2024 at 07:39:55AM +0000, Norihiko Hama wrote:
> > > Sorry, but module parameters are from the 1990's, we will not go back to that if at all possible as it's not easy to maintain and will not work properly for multiple devices.
> > >
> > > I can understand wanting something between 1 and 0 seconds, but adding yet-another-option isn't probably the best way, sorry.
> > 1 second does not meet with performance requirement.
> > I have no good idea except module parameter so that we can maintain backward compatibility but be configurable out of module.
> > Do you have any other better solution?
>
> Can you accomplish what you want with a quirk flag?

I think that it's hard to do that because 'quirk' is specified for a device
but it's difficult to identify the devices to make quirk, especially for future introduced devices.

Can we change the design of existing 'delay_use' ?
For example, 'delay_use' is 32-bit value and the value "1000 secs" does not make sense to set it,
So if it's set to '1100', it's treated as "100 / 1000 = 0.1 sec". Is this possible?