Hi Vinod, > -----Original Message----- > From: Vinod Koul [mailto:vinod.koul@xxxxxxxxx] > Sent: Wednesday, April 06, 2016 3:23 AM > To: Appana Durga Kedareswara Rao <appanad@xxxxxxxxxx> > Cc: dan.j.williams@xxxxxxxxx; Michal Simek <michals@xxxxxxxxxx>; Soren > Brinkmann <sorenb@xxxxxxxxxx>; Appana Durga Kedareswara Rao > <appanad@xxxxxxxxxx>; moritz.fischer@xxxxxxxxx; > laurent.pinchart@xxxxxxxxxxxxxxxx; luis@xxxxxxxxxxxxxxxxx; Srikanth > Vemula <svemula@xxxxxxxxxx>; Anirudha Sarangi <anirudh@xxxxxxxxxx>; > dmaengine@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v3 2/2] dmaengine: vdma: Fix race condition in Non-SG > mode > > On Fri, Mar 25, 2016 at 02:46:39PM +0530, Kedareswara rao Appana wrote: > > When VDMA is configured in Non-sg mode Users can queue descriptors > > greater than h/w configured frames. > > > > Current driver allows the user to queue descriptors upto h/w configured. > > Which is wrong for non-sg mode configuration. > > I see to have standalone patch 2, where is 1st patch? > > There seems to be an issue with other 6 patch series with threading broken and > few patches showing up standalone and not part of series > > Can you resend the whole thing please.. Ok Sure will resend both the patch series again.... Regards, Kedar. > > > > > This patch fixes this issue. > > > > Signed-off-by: Kedareswara rao Appana <appanad@xxxxxxxxxx> > > --- > > Changes for v3: > > ---> New patch. > > > > drivers/dma/xilinx/xilinx_vdma.c | 25 +++++++++++++++++++------ > > 1 file changed, 19 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/dma/xilinx/xilinx_vdma.c > > b/drivers/dma/xilinx/xilinx_vdma.c > > index abe915c..b873d98 100644 > > --- a/drivers/dma/xilinx/xilinx_vdma.c > > +++ b/drivers/dma/xilinx/xilinx_vdma.c > > @@ -209,6 +209,7 @@ struct xilinx_vdma_tx_descriptor { > > * @flush_on_fsync: Flush on Frame sync > > * @desc_pendingcount: Descriptor pending count > > * @ext_addr: Indicates 64 bit addressing is supported by dma channel > > + * @desc_submitcount: Descriptor h/w submitted count > > */ > > struct xilinx_vdma_chan { > > struct xilinx_vdma_device *xdev; > > @@ -233,6 +234,7 @@ struct xilinx_vdma_chan { > > bool flush_on_fsync; > > u32 desc_pendingcount; > > bool ext_addr; > > + u32 desc_submitcount; > > }; > > > > /** > > @@ -716,9 +718,10 @@ static void xilinx_vdma_start_transfer(struct > xilinx_vdma_chan *chan) > > struct xilinx_vdma_tx_segment *segment, *last = NULL; > > int i = 0; > > > > - list_for_each_entry(desc, &chan->pending_list, node) { > > - segment = list_first_entry(&desc->segments, > > - struct xilinx_vdma_tx_segment, > node); > > + if (chan->desc_submitcount < chan->num_frms) > > + i = chan->desc_submitcount; > > + > > + list_for_each_entry(segment, &desc->segments, node) { > > if (chan->ext_addr) > > vdma_desc_write_64(chan, > > > XILINX_VDMA_REG_START_ADDRESS_64(i++), > > @@ -742,8 +745,17 @@ static void xilinx_vdma_start_transfer(struct > xilinx_vdma_chan *chan) > > vdma_desc_write(chan, XILINX_VDMA_REG_VSIZE, last- > >hw.vsize); > > } > > > > - list_splice_tail_init(&chan->pending_list, &chan->active_list); > > - chan->desc_pendingcount = 0; > > + if (!chan->has_sg) { > > + list_del(&desc->node); > > + list_add_tail(&desc->node, &chan->active_list); > > + chan->desc_submitcount++; > > + chan->desc_pendingcount--; > > + if (chan->desc_submitcount == chan->num_frms) > > + chan->desc_submitcount = 0; > > + } else { > > + list_splice_tail_init(&chan->pending_list, &chan->active_list); > > + chan->desc_pendingcount = 0; > > + } > > } > > > > /** > > @@ -927,7 +939,8 @@ append: > > list_add_tail(&desc->node, &chan->pending_list); > > chan->desc_pendingcount++; > > > > - if (unlikely(chan->desc_pendingcount > chan->num_frms)) { > > + if (chan->has_sg && > > + unlikely(chan->desc_pendingcount > chan->num_frms)) { > > dev_dbg(chan->dev, "desc pendingcount is too high\n"); > > chan->desc_pendingcount = chan->num_frms; > > } > > -- > > 2.1.2 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe dmaengine" > > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > > info at http://vger.kernel.org/majordomo-info.html > > -- > ~Vinod -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
