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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 25-07-19, 17:07, Peter Ujfalusi wrote: > > > On 25/07/2019 16.37, Vinod Koul wrote: > > On 16-07-19, 11:24, Peter Ujfalusi wrote: > >> When a DMA client driver does not set the DMA_PREP_INTERRUPT because it > >> does not want to use interrupts for DMA completion or because it can not > >> rely on DMA interrupts due to executing the memcpy when interrupts are > >> disabled it will poll the status of the transfer. > >> > >> If the interrupts are enabled then the cookie will be set completed in the > >> interrupt handler so only check in HW completion when the polling is really > >> needed. > >> > >> Signed-off-by: Peter Ujfalusi > >> --- > >> drivers/dma/ti/omap-dma.c | 44 +++++++++++++++++++++++++-------------- > >> 1 file changed, 28 insertions(+), 16 deletions(-) > >> > >> diff --git a/drivers/dma/ti/omap-dma.c b/drivers/dma/ti/omap-dma.c > >> index 029c0bd550d5..966d8f0323b5 100644 > >> --- a/drivers/dma/ti/omap-dma.c > >> +++ b/drivers/dma/ti/omap-dma.c > >> @@ -91,6 +91,7 @@ struct omap_desc { > >> bool using_ll; > >> enum dma_transfer_direction dir; > >> dma_addr_t dev_addr; > >> + bool polled; > >> > >> int32_t fi; /* for OMAP_DMA_SYNC_PACKET / double indexing */ > >> int16_t ei; /* for double indexing */ > >> @@ -815,26 +816,20 @@ static enum dma_status omap_dma_tx_status(struct dma_chan *chan, > >> struct virt_dma_desc *vd; > >> enum dma_status ret; > >> unsigned long flags; > >> + struct omap_desc *d = NULL; > >> > >> ret = dma_cookie_status(chan, cookie, txstate); > >> - > >> - if (!c->paused && c->running) { > >> - uint32_t ccr = omap_dma_chan_read(c, CCR); > >> - /* > >> - * The channel is no longer active, set the return value > >> - * accordingly > >> - */ > >> - if (!(ccr & CCR_ENABLE)) > >> - ret = DMA_COMPLETE; > >> - } > >> - > >> - if (ret == DMA_COMPLETE || !txstate) > >> + if (ret == DMA_COMPLETE) > > > > why do you want to continue for txstate being null? > > The caller could opt to not provide txstate and I still need to check if > the non completed transfer is actually done by the HW or not. > > > Also it would lead to NULL ptr deref for txstate > > There is a !txstate check to avoid that. > > > > >> return ret; > >> > >> spin_lock_irqsave(&c->vc.lock, flags); > >> + if (c->desc && c->desc->vd.tx.cookie == cookie) > >> + d = c->desc; > >> + > >> + if (!txstate) > >> + goto out; Oops missed that, let me check again and do the needful -- ~Vinod _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel