From a55e07c8a5aaf5442d10b0b392ce8ce41a96921d Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Thu, 8 Jan 2015 18:29:25 +0200 Subject: [PATCH] dmaengine: rcar-dmac: Fix uninitialized variable usage The desc variable is used uninitialized in the rcar_dmac_desc_get() and rcar_dmac_xfer_chunk_get() functions if descriptors need to be allocated. Fix it. Reported-by: Dan Carpenter Signed-off-by: Laurent Pinchart Signed-off-by: Vinod Koul --- drivers/dma/sh/rcar-dmac.c | 69 +++++++++++++++++++++------------------------- 1 file changed, 31 insertions(+), 38 deletions(-) diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c index 29dd09a..8367578 100644 --- a/drivers/dma/sh/rcar-dmac.c +++ b/drivers/dma/sh/rcar-dmac.c @@ -549,26 +549,22 @@ static struct rcar_dmac_desc *rcar_dmac_desc_get(struct rcar_dmac_chan *chan) spin_lock_irq(&chan->lock); - do { - if (list_empty(&chan->desc.free)) { - /* - * No free descriptors, allocate a page worth of them - * and try again, as someone else could race us to get - * the newly allocated descriptors. If the allocation - * fails return an error. - */ - spin_unlock_irq(&chan->lock); - ret = rcar_dmac_desc_alloc(chan, GFP_NOWAIT); - if (ret < 0) - return NULL; - spin_lock_irq(&chan->lock); - continue; - } + while (list_empty(&chan->desc.free)) { + /* + * No free descriptors, allocate a page worth of them and try + * again, as someone else could race us to get the newly + * allocated descriptors. If the allocation fails return an + * error. + */ + spin_unlock_irq(&chan->lock); + ret = rcar_dmac_desc_alloc(chan, GFP_NOWAIT); + if (ret < 0) + return NULL; + spin_lock_irq(&chan->lock); + } - desc = list_first_entry(&chan->desc.free, struct rcar_dmac_desc, - node); - list_del(&desc->node); - } while (!desc); + desc = list_first_entry(&chan->desc.free, struct rcar_dmac_desc, node); + list_del(&desc->node); spin_unlock_irq(&chan->lock); @@ -621,26 +617,23 @@ rcar_dmac_xfer_chunk_get(struct rcar_dmac_chan *chan) spin_lock_irq(&chan->lock); - do { - if (list_empty(&chan->desc.chunks_free)) { - /* - * No free descriptors, allocate a page worth of them - * and try again, as someone else could race us to get - * the newly allocated descriptors. If the allocation - * fails return an error. - */ - spin_unlock_irq(&chan->lock); - ret = rcar_dmac_xfer_chunk_alloc(chan, GFP_NOWAIT); - if (ret < 0) - return NULL; - spin_lock_irq(&chan->lock); - continue; - } + while (list_empty(&chan->desc.chunks_free)) { + /* + * No free descriptors, allocate a page worth of them and try + * again, as someone else could race us to get the newly + * allocated descriptors. If the allocation fails return an + * error. + */ + spin_unlock_irq(&chan->lock); + ret = rcar_dmac_xfer_chunk_alloc(chan, GFP_NOWAIT); + if (ret < 0) + return NULL; + spin_lock_irq(&chan->lock); + } - chunk = list_first_entry(&chan->desc.chunks_free, - struct rcar_dmac_xfer_chunk, node); - list_del(&chunk->node); - } while (!chunk); + chunk = list_first_entry(&chan->desc.chunks_free, + struct rcar_dmac_xfer_chunk, node); + list_del(&chunk->node); spin_unlock_irq(&chan->lock); -- 2.7.4