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xHCI: add cmd_ring_state

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Adding cmd_ring_state for command ring. It helps to verify
the current command ring state for controlling the command
ring operations.

This patch should be backported to kernels as old as 3.0.  The commit
7ed603ecf8 "xhci: Add an assertion to
check for virt_dev=0 bug." papers over the NULL pointer dereference that
I now believe is related to a timed out Set Address command.  This (and
the four patches that follow it) contain the real fix that also allows
VIA USB 3.0 hubs to consistently re-enumerate during the plug/unplug
stress tests.

Signed-off-by: Elric Fu <elricfu1@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Miroslav Sabljic <miroslav.sabljic@avl.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Elric Fu 2012-06-27 16:30:57 +08:00 • committed by Sarah Sharp
parent c2d57aec81
commit c181bc5b5d
3 changed files with 11 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/usb/host/xhci.c
View file

@ -104,9 +104,10 @@ int xhci_halt(struct xhci_hcd *xhci)
ret = handshake(xhci, &xhci->op_regs->status,
STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
if (!ret)
if (!ret) {
xhci->xhc_state |= XHCI_STATE_HALTED;
else
xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
} else
xhci_warn(xhci, "Host not halted after %u microseconds.\n",
XHCI_MAX_HALT_USEC);
return ret;
@ -485,6 +486,7 @@ static int xhci_run_finished(struct xhci_hcd *xhci)
return -ENODEV;
}
xhci->shared_hcd->state = HC_STATE_RUNNING;
xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
if (xhci->quirks & XHCI_NEC_HOST)
xhci_ring_cmd_db(xhci);