diff options
| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2016-11-11 15:13:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-14 10:18:21 +0100 |
| commit | c11ae038d62bf07231be7b813435e5067c978ddc (patch) | |
| tree | 45509002a08622b466fad822c26a0e620505d61e /drivers/usb/host/xhci.c | |
| parent | 99154fd3aa9ce49f0fb842f2b07f174ae7345b64 (diff) | |
| download | linux-c11ae038d62bf07231be7b813435e5067c978ddc.tar.bz2 | |
xhci: don't try to reset the host if it is unaccessible
There is no point in trying to reset the host controller by writing
to its registers if host is removed and registers just return 0xffffffff
bail out and return -ENODEV instead
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index b503189b98b0..641663f18fdb 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -167,6 +167,12 @@ int xhci_reset(struct xhci_hcd *xhci) int ret, i; state = readl(&xhci->op_regs->status); + + if (state == ~(u32)0) { + xhci_warn(xhci, "Host not accessible, reset failed.\n"); + return -ENODEV; + } + if ((state & STS_HALT) == 0) { xhci_warn(xhci, "Host controller not halted, aborting reset.\n"); return 0; @@ -690,7 +696,6 @@ void xhci_stop(struct usb_hcd *hcd) xhci->cmd_ring_state = CMD_RING_STATE_STOPPED; xhci_halt(xhci); xhci_reset(xhci); - spin_unlock_irq(&xhci->lock); } |