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[usb] Clear device endpoint halt before resetting host endpoint

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Resetting the host endpoint may immediately restart any pending
transfers for that endpoint.  If the device endpoint halt has not yet
been cleared, then this will probably result in a second failed
transfer.

This second failure may be detected within usb_endpoint_reset() while
waiting for usb_clear_feature() to complete.  The endpoint will
subsequently be removed from the list of halted endpoints, causing the
second failure to be effectively ignored and leaving the host endpoint
in a permanently halted state.

Fix by deferring the host endpoint reset until after the device
endpoint is ready to accept new transfers.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2020-07-02 02:51:58 +01:00
parent d5874c9f2b
commit 5d6fb72829
1 changed files with 7 additions and 7 deletions
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14
src/drivers/bus/usb.c
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@@ -405,13 +405,6 @@ static int usb_endpoint_reset ( struct usb_endpoint *ep ) {
/* Sanity check */
assert ( ! list_empty ( &ep->halted ) );
/* Reset endpoint */
if ( ( rc = ep->host->reset ( ep ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not reset: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
return rc;
}
/* Clear transaction translator, if applicable */
if ( ( rc = usb_endpoint_clear_tt ( ep ) ) != 0 )
return rc;
@@ -427,6 +420,13 @@ static int usb_endpoint_reset ( struct usb_endpoint *ep ) {
return rc;
}
/* Reset endpoint */
if ( ( rc = ep->host->reset ( ep ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not reset: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
return rc;
}
/* Remove from list of halted endpoints */
list_del ( &ep->halted );
INIT_LIST_HEAD ( &ep->halted );