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[xhci] Fail attempts to issue concurrent commands

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The xHCI driver can handle only a single command TRB in progress at
any one time.  Immediately fail any attempts to issue concurrent
commands (which should not occur in normal operation).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2021-01-03 19:08:49 +00:00
parent 988d2c13cd
commit 017b345d5a
1 changed files with 8 additions and 0 deletions
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8
src/drivers/usb/xhci.c
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@@ -1813,6 +1813,13 @@ static int xhci_command ( struct xhci_device *xhci, union xhci_trb *trb ) {
unsigned int i;
int rc;
/* Sanity check */
if ( xhci->pending != NULL ) {
DBGC ( xhci, "XHCI %s command ring busy\n", xhci->name );
rc = -EBUSY;
goto err_pending;
}
/* Record the pending command */
xhci->pending = trb;
@@ -1855,6 +1862,7 @@ static int xhci_command ( struct xhci_device *xhci, union xhci_trb *trb ) {
err_enqueue:
xhci->pending = NULL;
err_pending:
return rc;
}