From 93ba9fc346f809e3fd32883219bffbdc04fd9a3c Mon Sep 17 00:00:00 2001 From: Thomas Hellstrom Date: Thu, 28 Aug 2014 11:53:23 +0200 Subject: [PATCH] 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 Reported-by: Mark Sheldon Reviewed-by: Jakob Bornecrantz Reivewed-by: Mark Sheldon Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c index 3eb148667d63..89664933861f 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c @@ -163,8 +163,9 @@ 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); -- 2.20.1