Messages in this thread Patch in this message | | | Date | Wed, 05 Jan 2011 16:23:32 -0800 | From | Greg KH <> | Subject | [113/152] xhci: Fix issue with port array setup and buggy hosts. |
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2.6.36-stable review patch. If anyone has any objections, please let us know.
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From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
commit f8bbeabc34aa945ab4275abc9a4dfde0aea798ca upstream.
Fix two bugs with the port array setup.
The first bug will only show up with broken xHCI hosts with Extended Capabilities registers that have duplicate port speed entries for the same port. The idea with the original code was to set the port_array entry to -1 if the duplicate port speed entry said the port was a different speed than the original port speed entry. That would mean that later, the port would not be exposed to the USB core. Unfortunately, I forgot a continue statement, and the port_array entry would just be overwritten in the next line.
The second bug would happen if there are conflicting port speed registers (so that some entry in port_array is -1), or one of the hardware port registers was not described in the port speed registers (so that some entry in port_array is 0). The code that sets up the usb2_ports array would accidentally claim those ports. That wouldn't really cause any user-visible issues, but it is a bug.
This patch should go into the stable trees that have the port array and USB 3.0 port disabling prevention patches.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/usb/host/xhci-mem.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-)
--- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1677,6 +1677,7 @@ static void xhci_add_in_port(struct xhci xhci->port_array[i] = (u8) -1; } /* FIXME: Should we disable the port? */ + continue; } xhci->port_array[i] = major_revision; if (major_revision == 0x03) @@ -1755,16 +1756,20 @@ static int xhci_setup_port_arrays(struct return -ENOMEM; port_index = 0; - for (i = 0; i < num_ports; i++) - if (xhci->port_array[i] != 0x03) { - xhci->usb2_ports[port_index] = - &xhci->op_regs->port_status_base + - NUM_PORT_REGS*i; - xhci_dbg(xhci, "USB 2.0 port at index %u, " - "addr = %p\n", i, - xhci->usb2_ports[port_index]); - port_index++; - } + for (i = 0; i < num_ports; i++) { + if (xhci->port_array[i] == 0x03 || + xhci->port_array[i] == 0 || + xhci->port_array[i] == -1) + continue; + + xhci->usb2_ports[port_index] = + &xhci->op_regs->port_status_base + + NUM_PORT_REGS*i; + xhci_dbg(xhci, "USB 2.0 port at index %u, " + "addr = %p\n", i, + xhci->usb2_ports[port_index]); + port_index++; + } } if (xhci->num_usb3_ports) { xhci->usb3_ports = kmalloc(sizeof(*xhci->usb3_ports)*
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