diff options
| author |   Mika Westerberg <mika.westerberg@linux.intel.com> | 2017-06-06 15:25:15 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-09 11:42:43 +0200 |
| commit | bdccf295d7cdf6f28ceec1dcc31a79d0a1697d21 (patch) | |
| tree | 41926128da459fc10bfaba4b3ce6feec0cab1a0e /drivers/thunderbolt/nhi.c | |
| parent | thunderbolt: Add support for DMA configuration based mailbox (diff) | |
| download | linux-dev-bdccf295d7cdf6f28ceec1dcc31a79d0a1697d21.tar.xz linux-dev-bdccf295d7cdf6f28ceec1dcc31a79d0a1697d21.zip | |
thunderbolt: Do not touch the hardware if the NHI is gone on resume
On PCs the NHI host controller is only present when there is a device
connected. When the last device is disconnected the host controller will
dissappear shortly (within 10s). Now if that happens when we are
suspended we should not try to touch the hardware anymore, so add a flag
for this and check it before we re-enable rings.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/thunderbolt/nhi.c')
| -rw-r--r-- | drivers/thunderbolt/nhi.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index c358c074f925..14311535661d 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -403,6 +403,8 @@ void ring_start(struct tb_ring *ring) { mutex_lock(&ring->nhi->lock); mutex_lock(&ring->lock); + if (ring->nhi->going_away) + goto err; if (ring->running) { dev_WARN(&ring->nhi->pdev->dev, "ring already started\n"); goto err; @@ -449,6 +451,8 @@ void ring_stop(struct tb_ring *ring) mutex_lock(&ring->lock); dev_info(&ring->nhi->pdev->dev, "stopping %s %d\n", RING_TYPE(ring), ring->hop); + if (ring->nhi->going_away) + goto err; if (!ring->running) { dev_WARN(&ring->nhi->pdev->dev, "%s %d already stopped\n", RING_TYPE(ring), ring->hop); @@ -653,6 +657,14 @@ static int nhi_resume_noirq(struct device *dev) struct pci_dev *pdev = to_pci_dev(dev); struct tb *tb = pci_get_drvdata(pdev); + /* + * Check that the device is still there. It may be that the user + * unplugged last device which causes the host controller to go + * away on PCs. + */ + if (!pci_device_is_present(pdev)) + tb->nhi->going_away = true; + return tb_domain_resume_noirq(tb); } |