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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>
This commit is contained in:
Thomas Hellstrom 2014-08-28 11:53:23 +02:00
parent 9f9cb84f41
commit f01ea0c3d9
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
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@ -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);