ChangeSet 1.1371.759.31, 2004/04/26 16:10:49-07:00, [EMAIL PROTECTED]
[PATCH] USB: usb-storage driver changes for 2.6.x [3/4]
This patch adds some clear-halt calls if a GetMaxLUN fails. Apparently,
some devices (like certain early-rev Zip100s) stall their bulk pipes if
they receive a GetMaxLUN.
drivers/usb/storage/transport.c | 11 +++++++++++
1 files changed, 11 insertions(+)
diff -Nru a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
--- a/drivers/usb/storage/transport.c Fri May 14 15:32:22 2004
+++ b/drivers/usb/storage/transport.c Fri May 14 15:32:22 2004
@@ -908,6 +908,17 @@
USB_RECIP_INTERFACE,
0, us->ifnum, us->iobuf, 1, HZ);
+ /*
+ * Some devices (i.e. Iomega Zip100) need this -- apparently
+ * the bulk pipes get STALLed when the GetMaxLUN request is
+ * processed. This is, in theory, harmless to all other devices
+ * (regardless of if they stall or not).
+ */
+ if (result < 0) {
+ usb_stor_clear_halt(us, us->recv_bulk_pipe);
+ usb_stor_clear_halt(us, us->send_bulk_pipe);
+ }
+
US_DEBUGP("GetMaxLUN command result is %d, data is %d\n",
result, us->iobuf[0]);
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