lkml.org 
[lkml]   [2008]   [Mar]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] mass storage : emulation of sat scsi_pass_thru with ATACB
Hi Matthew,

thanks for your comments

Matthew Dharm wrote:
> Why are you using an initializer instead of a new protocol code?
Because using a new protocol code means I need to patch all the place
where there is a comparison between us->subclass and US_SC_SCSI.
After all I am US_SC_SCSI with a special case for ATA12 & ATA16 commands.
I don't translate all scsi to atacb (that's what does US_SC_ISD200).

>
> Most of this should probably be moved into it's own file, just like all of
> the other protocol handlers.
Ok, I will move it in another file.
>
> Actually, why do you even have a separate 'dispatcher' function? Why not
> just one protocol handler function which checks the command at the top and
> calls invoke_transport there?
What do you means by having a separate 'dispatcher' function?
You means why I have 2 functions emulate_pass_thru_with_atacb and
usb_stor_transparent_scsi_command_atacb ?
I did 2 functions for having a code more clean.

You suggest something like
void usb_stor_transparent_scsi_command_atacb(struct scsi_cmnd *srb,
struct us_data *us)
{
if (srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12) {
usb_stor_invoke_transport(srb, us);
return;
}
copy emulate_pass_thru_with_atacb code here
}

>
> Also, unless ATACB is a new standard (and I don't think it is, as the
> Cypress datasheet uses the term 'vendor specific'), then your functions
> need renaming. Instead of 'emulate_pass_thru_with_atacb', how about
> something like 'cypress_atacb' -- since it's already a protocol handler,
> everyone already knows it's for passing commands.
But 'emulate_pass_thru_with_atacb' only handle ATA pass_thru scsi
commands. It doesn't translate all scsi commands to atacb like
'cypress_atacb' could suggest.
That's why I put 'usb_stor_transparent_scsi_command_atacb' saying it is
transparent_scsi_command + atacb support.

Matthieu


\
 
 \ /
  Last update: 2008-03-08 21:11    [W:0.325 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site