linux-kernel - [GIT] dmaengine fixes for 2.6.36-rc7

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Date:	Wed, 29 Sep 2010 17:05:33 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [GIT] dmaengine fixes for 2.6.36-rc7

Hi Linus, please pull from:

  git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git fixes

...to receive some small fixes to drivers/dma/.  The mv_xor fix is
tagged for -stable.  Full changelog below.

Thanks,
Dan

Dan Carpenter (1):
      dma/shdma: move dereference below the NULL check

Mathieu Lacage (1):
      missing inline keyword for static function in linux/dmaengine.h

Simon Guinot (1):
      dmaengine: fix interrupt clearing for mv_xor

 drivers/dma/mv_xor.c      |    2 +-
 drivers/dma/shdma.c       |    3 ++-
 include/linux/dmaengine.h |    2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

commit cc60f8878eab892c03d06b10f389232b9b66bd83
Author: Simon Guinot <sguinot@...ie.com>
Date:   Fri Sep 17 23:33:51 2010 +0200

    dmaengine: fix interrupt clearing for mv_xor
    
    When using simultaneously the two DMA channels on a same engine, some
    transfers are never completed. For example, an endless lock can occur
    while writing heavily on a RAID5 array (with async-tx offload support
    enabled).
    
    Note that this issue can also be reproduced by using the DMA test
    client.
    
    On a same engine, the interrupt cause register is shared between two
    DMA channels. This patch make sure that the cause bit is only cleared
    for the requested channel.
    
    Signed-off-by: Simon Guinot <sguinot@...ie.com>
    Tested-by: Luc Saillard <luc@...llard.org>
    Acked-by: saeed bishara <saeed.bishara@...il.com>
    Cc: <stable@...nel.org>
    Signed-off-by: Dan Williams <dan.j.williams@...el.com>

commit d3f3cf859db17cc5f8156c5bfcd032413e44483b
Author: Mathieu Lacage <mathieu.lacage@...hia.inria.fr>
Date:   Sat Aug 14 15:02:44 2010 +0200

    missing inline keyword for static function in linux/dmaengine.h
    
    Add a missing inline keyword for static function in linux/dmaengine.h to
    avoid duplicate symbol definitions.
    
    Signed-off-by: Mathieu Lacage <mathieu.lacage@...hia.inria.fr>
    Signed-off-by: Dan Williams <dan.j.williams@...el.com>

commit 9f9ff20d46c6728b092f34b6a642e1e81ab5e254
Author: Dan Carpenter <error27@...il.com>
Date:   Sat Aug 14 11:01:45 2010 +0200

    dma/shdma: move dereference below the NULL check
    
    "param" can be NULL here, so only dereference it after the check.
    
    Signed-off-by: Dan Carpenter <error27@...il.com>
    Signed-off-by: Dan Williams <dan.j.williams@...el.com>


diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 86c5ae9..411d5bf 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -162,7 +162,7 @@ static int mv_is_err_intr(u32 intr_cause)
 
 static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan)
 {
-	u32 val = (1 << (1 + (chan->idx * 16)));
+	u32 val = ~(1 << (chan->idx * 16));
 	dev_dbg(chan->device->common.dev, "%s, val 0x%08x\n", __func__, val);
 	__raw_writel(val, XOR_INTR_CAUSE(chan));
 }
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index fb64cf3..eb6b54d 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -580,7 +580,6 @@ static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
 
 	sh_chan = to_sh_chan(chan);
 	param = chan->private;
-	slave_addr = param->config->addr;
 
 	/* Someone calling slave DMA on a public channel? */
 	if (!param || !sg_len) {
@@ -589,6 +588,8 @@ static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
 		return NULL;
 	}
 
+	slave_addr = param->config->addr;
+
 	/*
 	 * if (param != NULL), this is a successfully requested slave channel,
 	 * therefore param->config != NULL too.
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index c61d4ca..e210649 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -548,7 +548,7 @@ static inline bool dma_dev_has_pq_continue(struct dma_device *dma)
 	return (dma->max_pq & DMA_HAS_PQ_CONTINUE) == DMA_HAS_PQ_CONTINUE;
 }
 
-static unsigned short dma_dev_to_maxpq(struct dma_device *dma)
+static inline unsigned short dma_dev_to_maxpq(struct dma_device *dma)
 {
 	return dma->max_pq & ~DMA_HAS_PQ_CONTINUE;
 }


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