Re: Fw: Elitegroup K7S5A + usb_storage problem

[Pete Zaitcev <zaitcev@redhat.com>]

> when i delete the files which are on the stick and do an umount/mount cycle, 
> the files are there again. 
>[... other mail ...]

> I did the usbmon thing (hopefully correctly). Attached is the output.

Yes, that was perfect, thanks a lot. Unfortunately, I do not see a lot
of interesting things. The last write before the disconnect is a FAT
update:

c31650b8 1617078003 S Bo:006:01 -115 31 = 55534243 c6000000 00020000 00000a2a 00000000 30000001 00000000 000000
c31650b8 1617078987 C Bo:006:01 0 31 >
c31650b8 1617078997 S Bo:006:01 -115 512 = f8ffffff ffffffff ffffffff 00000000 00000000 00000000 00000000 00000000
c31650b8 1617080988 C Bo:006:01 0 512 >
c31650b8 1617080998 S Bi:006:02 -115 13 <
c31650b8 1617084987 C Bi:006:02 0 13 = 55534253 c6000000 00000000 00

Only one cluster was taken, when compared with the FAT that was read.
Everything seems to be in order. But the next trace (after replug -
see the device number changing from 6 to 7) shows FAT with old contents
being read (same block number 0x30):

> cd6960b8 1874976301 S Bo:007:01 -115 31 = 55534243 0b000000 00020000 80000a28 00000000 30000001 00000000 000000
> cd6960b8 1874977274 C Bo:007:01 0 31 >
> cd6960b8 1874977288 S Bi:007:02 -115 512 <
> cd6960b8 1874979271 C Bi:007:02 0 512 = f8ffffff ffffffff ffff0000 00000000 00000000 00000000 00000000 00000000
> cd6960b8 1874979282 S Bi:007:02 -115 13 <
> cd6960b8 1874981271 C Bi:007:02 0 13 = 55534253 0b000000 00000000 00

So, the device replies that writes were successful, but does not
actually commit them to the stable storage.

I suspect that this device may require some delays. I seem to recall
that we added delayes to usb-storage when we worked with Genesys
Logic. But ub contains no delays.

How about this:

--- linux-2.6.13-rc4/drivers/block/ub.c	2005-07-29 19:51:00.000000000 -0700
+++ linux-2.6.13-rc4-lem/drivers/block/ub.c	2005-08-07 13:48:11.000000000 -0700
@@ -1209,6 +1279,8 @@
 			return;
 		}
 
+		udelay(125);	// XXX for Martin Maurer <martinmaurer@gmx.at> 
+
 		UB_INIT_COMPLETION(sc->work_done);
 
 		if (cmd->dir == UB_DIR_READ)

Please try this patchlet and let us know how it went.

-- Pete
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