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authorJeff Harris <jeff_harris@kentrox.com>2011-09-23 11:49:36 -0400
committerGrant Likely <grant.likely@secretlab.ca>2011-09-23 17:28:29 -0600
commit387719c2ec995019e0af0dc537ca17c9ebd5b64f (patch)
tree7c8761429702dc6974e016de62d25e690b4cd9fe
parent4cc122ac913dbd662403a4a173c41e0d59ab5bdd (diff)
spi: Fix WARN when removing spi-fsl-spi module
If CPM mode is not used, the fsl_dummy_rx variable is never allocated. When the cleanup attempts to free it, the reference count is zero and a WARN is generated. The same CPM mode check used in the initialize is applied to the free as well. Tested on 2.6.33 with the previous spi_mpc8xxx driver. The renamed spi-fsl-spi driver looks to have the same problem. Signed-off-by: Jeff Harris <jeff_harris@kentrox.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
-rw-r--r--drivers/spi/spi-fsl-spi.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index d2407558773..24cacff5778 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -825,6 +825,9 @@ static void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi)
{
struct device *dev = mspi->dev;
+ if (!(mspi->flags & SPI_CPM_MODE))
+ return;
+
dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
cpm_muram_free(cpm_muram_offset(mspi->tx_bd));