Factor the freeing of the dma buffers out of the (*detach).
Move the freeing of the buffers so that it occurs after the PCI device
has been disabled to avoid any race condition.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/gsc_hpdi.c | 45 ++++++++++++++++++-------------
1 file changed, 27 insertions(+), 18 deletions(-)
diff --git a/drivers/staging/comedi/drivers/gsc_hpdi.c
b/drivers/staging/comedi/drivers/gsc_hpdi.c
index 91c1e8c..b4c1c11 100644
--- a/drivers/staging/comedi/drivers/gsc_hpdi.c
+++ b/drivers/staging/comedi/drivers/gsc_hpdi.c
@@ -507,6 +507,32 @@ static int gsc_hpdi_dio_insn_config(struct comedi_device
*dev,
return insn->n;
}
+static void gsc_hpdi_free_dma(struct comedi_device *dev)
+{
+ struct pci_dev *pcidev = comedi_to_pci_dev(dev);
+ struct hpdi_private *devpriv = dev->private;
+ int i;
+
+ if (!devpriv)
+ return;
+
+ /* free pci dma buffers */
+ for (i = 0; i < NUM_DMA_BUFFERS; i++) {
+ if (devpriv->dio_buffer[i])
+ pci_free_consistent(pcidev,
+ DMA_BUFFER_SIZE,
+ devpriv->dio_buffer[i],
+ devpriv->dio_buffer_phys_addr[i]);
+ }
+ /* free dma descriptors */
+ if (devpriv->dma_desc)
+ pci_free_consistent(pcidev,
+ sizeof(struct plx_dma_desc) *
+ NUM_DMA_DESCRIPTORS,
+ devpriv->dma_desc,
+ devpriv->dma_desc_phys_addr);
+}
+
static int gsc_hpdi_init(struct comedi_device *dev)
{
struct hpdi_private *devpriv = dev->private;
@@ -681,9 +707,7 @@ static int gsc_hpdi_auto_attach(struct comedi_device *dev,
static void gsc_hpdi_detach(struct comedi_device *dev)
{
- struct pci_dev *pcidev = comedi_to_pci_dev(dev);
struct hpdi_private *devpriv = dev->private;
- unsigned int i;
if (dev->irq)
free_irq(dev->irq, dev);
@@ -694,24 +718,9 @@ static void gsc_hpdi_detach(struct comedi_device *dev)
}
if (dev->mmio)
iounmap(dev->mmio);
- /* free pci dma buffers */
- for (i = 0; i < NUM_DMA_BUFFERS; i++) {
- if (devpriv->dio_buffer[i])
- pci_free_consistent(pcidev,
- DMA_BUFFER_SIZE,
- devpriv->dio_buffer[i],
- devpriv->
- dio_buffer_phys_addr[i]);
- }
- /* free dma descriptors */
- if (devpriv->dma_desc)
- pci_free_consistent(pcidev,
- sizeof(struct plx_dma_desc) *
- NUM_DMA_DESCRIPTORS,
- devpriv->dma_desc,
- devpriv->dma_desc_phys_addr);
}
comedi_pci_disable(dev);
+ gsc_hpdi_free_dma(dev);
}
static struct comedi_driver gsc_hpdi_driver = {
--
2.0.3
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