narenas
/
opengnsys_ipxe
mirror of https://github.com/ipxe/ipxe.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[xhci] Fail attempts to issue concurrent commands 

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>
pull/204/head
Michael Brown 2021-01-03 19:08:49 +00:00
parent 988d2c13cd
commit 017b345d5a
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/drivers/usb/xhci.c
View File

@ -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;
}