Unit attention in USB storage
Subsystems (2)
Quoted 5 lines
Quoted 2 lines
[things work better when "Unit Attention: not ready to ready transition" is not regarded as an error]
I suggest trying this with 2.4.5 -- several people report that kernel works much better than previous ones with usb-storage.
The details of the behaviour are a bit different, but the essence is unchanged: with the same .config as the 2.4.3 I reported on, 2.4.5 failed. (With a different one it was successful. It is a matter of timing.) Again adding the patch:
drivers/usb/storage/debug.c Tue Jun 5 05:23:46 2001 renamed from linux-2.4.5/linux/drivers/usb/storage/debug.c Sat Sep 9 01:39:12 2000 +2 -0
@@ -302,6 +302,8 @@ case 0x1C00: what="defect list not found"; break; case 0x2400: what="invalid field in CDB"; break; case 0x2703: what="associated write protect"; break; + case 0x2800: what="not ready to ready transtion (media change?)"; + break; case 0x2903: what="bus device reset function occurred"; break; case 0x2904: what="device internal reset"; break; case 0x2B00: what="copy can't execute since host can't disconnect";
drivers/usb/storage/transport.c Tue Jun 5 05:23:13 2001 renamed from linux-2.4.5/linux/drivers/usb/storage/transport.c Wed Apr 18 20:49:12 2001 +9 -0
@@ -793,6 +793,15 @@ /* If things are really okay, then let's show that */ if ((srb->sense_buffer[2] & 0xf) == 0x0) srb->result = GOOD << 1; + + /* A transition from non-ready to ready sounds OK. */ + if ((srb->sense_buffer[2] & 0xf) == 0x6 /* unit attention */ + && srb->sense_buffer[12] == 0x28 + && srb->sense_buffer[13] == 0 /* not ready -> ready */) { + srb->result = GOOD << 1; + srb->sense_buffer[0] = 0; + } + } else /* if (need_auto_sense) */ srb->result = GOOD << 1;
makes things work.
Andries