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usb_block_drv: don't select alternate interface setting

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Selecting an alternate interface setting, even if it is the same as the
current one, apparently makes the INQUIRY command fail with USB devices
like 'SanDisk Ultra Fit' (0781:5583) and 'Corsair Flash Voyager'
(1b1c:1a03) when the USB block driver is restarted.

Fixes #2860
This commit is contained in:
Christian Prochaska 2018-06-11 15:09:29 +02:00 committed by Christian Helmuth
parent 347d82bdc6
commit d1524ba0b8
1 changed files with 15 additions and 21 deletions
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12
repos/os/src/drivers/usb_block/main.cc
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@ -381,9 +381,8 @@ struct Usb::Block_driver : Usb::Completion,
ISUBCLASS_SCSI = 6,
IPROTO_BULK_ONLY = 80
};
try {
Alternate_interface &alt_iface = iface.alternate_interface(0);
iface.set_alternate_interface(alt_iface);
Alternate_interface &alt_iface = iface.current();
if (alt_iface.iclass != ICLASS_MASS_STORAGE
|| alt_iface.isubclass != ISUBCLASS_SCSI
@ -394,7 +393,7 @@ struct Usb::Block_driver : Usb::Completion,
for (int i = 0; i < alt_iface.num_endpoints; i++) {
Endpoint ep = alt_iface.endpoint(i);
if (!ep.is_bulk())
if (!ep.bulk())
continue;
if (ep.address & Usb::ENDPOINT_IN)
ep_in = i;
@ -402,11 +401,6 @@ struct Usb::Block_driver : Usb::Completion,
ep_out = i;
}
} catch (Usb::Session::Interface_not_found) {
Genode::error("Interface not found");
return false;
}
try {
/*