dmaengine: rcar-dmac: fixup spinlock in rcar-dmac

Current rcar-dmac driver is using spin_lock_irq() / spin_unlock_irq()
in some functions. But, some other driver might call DMAEngine API
during interrupt disabled. In such case, rcar-dmac side spin_unlock_irq()
forcefully allows all interrupts. Therefore, other driver receives
unexpected interruption, and its exclusive access control will be broken.
This patch replaces spin_lock_irq() to spin_lock_irqsave(),
and spin_unlock_irq() to spin_unlock_irqrestore().

Reported-by: Cao Minh Hiep <cm-hiep@jinso.co.jp>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index a18d16c..e0302c7 100644 (file)
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -465,6 +465,7 @@ static dma_cookie_t rcar_dmac_tx_submit(struct dma_async_tx_descriptor *tx)
 static int rcar_dmac_desc_alloc(struct rcar_dmac_chan *chan, gfp_t gfp)
 {
        struct rcar_dmac_desc_page *page;
+       unsigned long flags;
        LIST_HEAD(list);
        unsigned int i;
 
@@ -482,10 +483,10 @@ static int rcar_dmac_desc_alloc(struct rcar_dmac_chan *chan, gfp_t gfp)
                list_add_tail(&desc->node, &list);
        }
 
-       spin_lock_irq(&chan->lock);
+       spin_lock_irqsave(&chan->lock, flags);
        list_splice_tail(&list, &chan->desc.free);
        list_add_tail(&page->node, &chan->desc.pages);
-       spin_unlock_irq(&chan->lock);
+       spin_unlock_irqrestore(&chan->lock, flags);
 
        return 0;
 }
@@ -516,6 +517,7 @@ static void rcar_dmac_desc_put(struct rcar_dmac_chan *chan,
 static void rcar_dmac_desc_recycle_acked(struct rcar_dmac_chan *chan)
 {
        struct rcar_dmac_desc *desc, *_desc;
+       unsigned long flags;
        LIST_HEAD(list);
 
        /*
@@ -524,9 +526,9 @@ static void rcar_dmac_desc_recycle_acked(struct rcar_dmac_chan *chan)
         * list_for_each_entry_safe, isn't safe if we release the channel lock
         * around the rcar_dmac_desc_put() call.
         */
-       spin_lock_irq(&chan->lock);
+       spin_lock_irqsave(&chan->lock, flags);
        list_splice_init(&chan->desc.wait, &list);
-       spin_unlock_irq(&chan->lock);
+       spin_unlock_irqrestore(&chan->lock, flags);
 
        list_for_each_entry_safe(desc, _desc, &list, node) {
                if (async_tx_test_ack(&desc->async_tx)) {
@@ -539,9 +541,9 @@ static void rcar_dmac_desc_recycle_acked(struct rcar_dmac_chan *chan)
                return;
 
        /* Put the remaining descriptors back in the wait list. */
-       spin_lock_irq(&chan->lock);
+       spin_lock_irqsave(&chan->lock, flags);
        list_splice(&list, &chan->desc.wait);
-       spin_unlock_irq(&chan->lock);
+       spin_unlock_irqrestore(&chan->lock, flags);
 }
 
 /*
@@ -556,12 +558,13 @@ static void rcar_dmac_desc_recycle_acked(struct rcar_dmac_chan *chan)
 static struct rcar_dmac_desc *rcar_dmac_desc_get(struct rcar_dmac_chan *chan)
 {
        struct rcar_dmac_desc *desc;
+       unsigned long flags;
        int ret;
 
        /* Recycle acked descriptors before attempting allocation. */
        rcar_dmac_desc_recycle_acked(chan);
 
-       spin_lock_irq(&chan->lock);
+       spin_lock_irqsave(&chan->lock, flags);
 
        while (list_empty(&chan->desc.free)) {
                /*
@@ -570,17 +573,17 @@ static struct rcar_dmac_desc *rcar_dmac_desc_get(struct rcar_dmac_chan *chan)
                 * allocated descriptors. If the allocation fails return an
                 * error.
                 */
-               spin_unlock_irq(&chan->lock);
+               spin_unlock_irqrestore(&chan->lock, flags);
                ret = rcar_dmac_desc_alloc(chan, GFP_NOWAIT);
                if (ret < 0)
                        return NULL;
-               spin_lock_irq(&chan->lock);
+               spin_lock_irqsave(&chan->lock, flags);
        }
 
        desc = list_first_entry(&chan->desc.free, struct rcar_dmac_desc, node);
        list_del(&desc->node);
 
-       spin_unlock_irq(&chan->lock);
+       spin_unlock_irqrestore(&chan->lock, flags);
 
        return desc;
 }
@@ -593,6 +596,7 @@ static struct rcar_dmac_desc *rcar_dmac_desc_get(struct rcar_dmac_chan *chan)
 static int rcar_dmac_xfer_chunk_alloc(struct rcar_dmac_chan *chan, gfp_t gfp)
 {
        struct rcar_dmac_desc_page *page;
+       unsigned long flags;
        LIST_HEAD(list);
        unsigned int i;
 
@@ -606,10 +610,10 @@ static int rcar_dmac_xfer_chunk_alloc(struct rcar_dmac_chan *chan, gfp_t gfp)
                list_add_tail(&chunk->node, &list);
        }
 
-       spin_lock_irq(&chan->lock);
+       spin_lock_irqsave(&chan->lock, flags);
        list_splice_tail(&list, &chan->desc.chunks_free);
        list_add_tail(&page->node, &chan->desc.pages);
-       spin_unlock_irq(&chan->lock);
+       spin_unlock_irqrestore(&chan->lock, flags);
 
        return 0;
 }
@@ -627,9 +631,10 @@ static struct rcar_dmac_xfer_chunk *
 rcar_dmac_xfer_chunk_get(struct rcar_dmac_chan *chan)
 {
        struct rcar_dmac_xfer_chunk *chunk;
+       unsigned long flags;
        int ret;
 
-       spin_lock_irq(&chan->lock);
+       spin_lock_irqsave(&chan->lock, flags);
 
        while (list_empty(&chan->desc.chunks_free)) {
                /*
@@ -638,18 +643,18 @@ rcar_dmac_xfer_chunk_get(struct rcar_dmac_chan *chan)
                 * allocated descriptors. If the allocation fails return an
                 * error.
                 */
-               spin_unlock_irq(&chan->lock);
+               spin_unlock_irqrestore(&chan->lock, flags);
                ret = rcar_dmac_xfer_chunk_alloc(chan, GFP_NOWAIT);
                if (ret < 0)
                        return NULL;
-               spin_lock_irq(&chan->lock);
+               spin_lock_irqsave(&chan->lock, flags);
        }
 
        chunk = list_first_entry(&chan->desc.chunks_free,
                                 struct rcar_dmac_xfer_chunk, node);
        list_del(&chunk->node);
 
-       spin_unlock_irq(&chan->lock);
+       spin_unlock_irqrestore(&chan->lock, flags);
 
        return chunk;
 }