From: Krzysztof Kozlowski Date: Mon, 15 Jun 2015 08:25:16 +0000 (+0900) Subject: dmaengine: pl330: Fix overflow when reporting residue in memcpy X-Git-Tag: v4.1.6~64 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=9cd4b78cd56489755fcba685b5e1a243cea6e6cf;p=users%2Fjedix%2Flinux-maple.git 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 Fixes: aee4d1fac887 ("dmaengine: pl330: improve pl330_tx_status() function") Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 340f9e607cd8b..8652388e77d69 100644 --- 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;