Commit f01ea0c3 authored Aug 28, 2014 by Thomas Hellstrom

drm/vmwgfx: Fix a potential infinite spin waiting for fifo idle



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>
Cc: <stable@vger.kernel.org>

parent 9f9cb84f

drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -180,8 +180,9 @@ void vmw_fifo_release(struct vmw_private dev_priv, struct vmw_fifo_state fifo)

		mutex_lock(&dev_priv->hw_mutex);

		while (vmw_read(dev_priv, SVGA_REG_BUSY) != 0)
		vmw_write(dev_priv, SVGA_REG_SYNC, SVGA_SYNC_GENERIC);
		while (vmw_read(dev_priv, SVGA_REG_BUSY) != 0)
		;

		dev_priv->last_read_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);