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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
7ed603e "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
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Elric Fu authored and Sarah Sharp committed Sep 13, 2012
1 parent c2d57ae commit c181bc5
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Showing 3 changed files with 11 additions and 2 deletions.
3 changes: 3 additions & 0 deletions drivers/usb/host/xhci-ring.c
Original file line number Diff line number Diff line change
Expand Up @@ -280,6 +280,9 @@ static inline int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring,
/* Ring the host controller doorbell after placing a command on the ring */
void xhci_ring_cmd_db(struct xhci_hcd *xhci)
{
if (!(xhci->cmd_ring_state & CMD_RING_STATE_RUNNING))
return;

xhci_dbg(xhci, "// Ding dong!\n");
xhci_writel(xhci, DB_VALUE_HOST, &xhci->dba->doorbell[0]);
/* Flush PCI posted writes */
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6 changes: 4 additions & 2 deletions drivers/usb/host/xhci.c
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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);
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4 changes: 4 additions & 0 deletions drivers/usb/host/xhci.h
Original file line number Diff line number Diff line change
Expand Up @@ -1421,6 +1421,10 @@ struct xhci_hcd {
/* data structures */
struct xhci_device_context_array *dcbaa;
struct xhci_ring *cmd_ring;
unsigned int cmd_ring_state;
#define CMD_RING_STATE_RUNNING (1 << 0)
#define CMD_RING_STATE_ABORTED (1 << 1)
#define CMD_RING_STATE_STOPPED (1 << 2)
unsigned int cmd_ring_reserved_trbs;
struct xhci_ring *event_ring;
struct xhci_erst erst;
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