dmaengine: pl330: Fix overflow when reporting residue in memcpy

commit ae128293d97404f491dc76f1843c7adacfec3441 upstream.

During memcpy operations the residue was always set to an u32 overflowed
value.

In pl330_tx_status() function number of currently transferred bytes was
subtracted from internal "bytes_requested" field. However this
"bytes_requested" was not initialized at start to length of memcpy
buffer so transferred bytes were subtracted from 0 causing overflow.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: aee4d1fac887 ("dmaengine: pl330: improve pl330_tx_status() function")
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 340f9e607cd8b90dfe75add027c18bd26d67f1e0..8652388e77d69a1cad4238c055ee18500a3e6852 100644 (file)
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2621,6 +2621,7 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
                desc->rqcfg.brst_len = 1;
 
        desc->rqcfg.brst_len = get_burst_len(desc, len);
+       desc->bytes_requested = len;
 
        desc->txd.flags = flags;