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| author | Thomas Hellstrom <thellstrom@vmware.com> | 2014-08-28 11:53:23 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-10-05 14:52:12 -0700 |
| commit | 119412bf17c24886ab0321bb3134839bdf84b135 (patch) | |
| tree | 7f41b081458e69bb2cab792a8a141a846992767f /drivers/gpu | |
| parent | 113c41a5ade197d34a70e09c9d9d09a201dd4ba9 (diff) | |
| download | lwn-119412bf17c24886ab0321bb3134839bdf84b135.tar.gz lwn-119412bf17c24886ab0321bb3134839bdf84b135.zip | |
drm/vmwgfx: Fix a potential infinite spin waiting for fifo idle
commit f01ea0c3d9db536c64d47922716d8b3b8f21d850 upstream.
The code waiting for fifo idle was incorrect and could possibly spin
forever under certain circumstances.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reported-by: Mark Sheldon <markshel@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Reivewed-by: Mark Sheldon <markshel@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c index 6ccd993e26bf..6eae14d2a3f7 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c @@ -180,8 +180,9 @@ void vmw_fifo_release(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo) mutex_lock(&dev_priv->hw_mutex); + vmw_write(dev_priv, SVGA_REG_SYNC, SVGA_SYNC_GENERIC); while (vmw_read(dev_priv, SVGA_REG_BUSY) != 0) - vmw_write(dev_priv, SVGA_REG_SYNC, SVGA_SYNC_GENERIC); + ; dev_priv->last_read_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE); |