linux-kernel - [GIT] dmaengine fixes for 2.6.37-rc8

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Date:	Mon, 03 Jan 2011 02:28:56 -0800
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>,
	linux-raid <linux-raid@...r.kernel.org>
Subject: [GIT] dmaengine fixes for 2.6.37-rc8

Hi Linus, please pull from:

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

...to receive:

A fix for a locking bug in the mv_xor driver, also tagged for -stable.
A compile fix for drivers sitting in -next.

--
Dan


Guennadi Liakhovetski (1):
      dmaengine: provide dummy functions for DMA_ENGINE=n

Saeed Bishara (1):
      mv_xor: fix race in tasklet function

 drivers/dma/mv_xor.c      |    2 +-
 include/linux/dmaengine.h |   13 ++++++++++---
 2 files changed, 11 insertions(+), 4 deletions(-)


commit 8f33d5277fada0291ea495f7fd44a3e7b7aa41d3
Author: Guennadi Liakhovetski <g.liakhovetski@....de>
Date:   Wed Dec 22 14:46:46 2010 +0100

    dmaengine: provide dummy functions for DMA_ENGINE=n
    
    This lets drivers, optionally using the dmaengine, build with DMA_ENGINE
    unselected.
    
    Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
    Signed-off-by: Dan Williams <dan.j.williams@...el.com>

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 9d8688b..8cd00ad 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -824,6 +824,8 @@ enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie);
 #ifdef CONFIG_DMA_ENGINE
 enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
 void dma_issue_pending_all(void);
+struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, void *fn_param);
+void dma_release_channel(struct dma_chan *chan);
 #else
 static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
 {
@@ -831,7 +833,14 @@ static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descript
 }
 static inline void dma_issue_pending_all(void)
 {
-	do { } while (0);
+}
+static inline struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask,
+					      dma_filter_fn fn, void *fn_param)
+{
+	return NULL;
+}
+static inline void dma_release_channel(struct dma_chan *chan)
+{
 }
 #endif
 
@@ -842,8 +851,6 @@ void dma_async_device_unregister(struct dma_device *device);
 void dma_run_dependencies(struct dma_async_tx_descriptor *tx);
 struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type);
 #define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y)
-struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, void *fn_param);
-void dma_release_channel(struct dma_chan *chan);
 
 /* --- Helper iov-locking functions --- */
 

commit 8333f65ef094e47020cd01452b4637e7daf5a77f
Author: Saeed Bishara <saeed@...vell.com>
Date:   Tue Dec 21 16:53:39 2010 +0200

    mv_xor: fix race in tasklet function
    
    use mv_xor_slot_cleanup() instead of __mv_xor_slot_cleanup() as the former function
    aquires the spin lock that needed to protect the drivers data.
    
    Cc: <stable@...nel.org>
    Signed-off-by: Saeed Bishara <saeed@...vell.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 411d5bf..a25f5f6 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -449,7 +449,7 @@ mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 static void mv_xor_tasklet(unsigned long data)
 {
 	struct mv_xor_chan *chan = (struct mv_xor_chan *) data;
-	__mv_xor_slot_cleanup(chan);
+	mv_xor_slot_cleanup(chan);
 }
 
 static struct mv_xor_desc_slot *


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