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Date: Tue, 13 Sep 2016 03:08:17 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: dmaengine@...r.kernel.org
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>,
Linus Walleij <linus.walleij@...aro.org>,
linux-kernel@...r.kernel.org,
Dan Williams <dan.j.williams@...el.com>,
Vinod Koul <vinod.koul@...el.com>,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] dmaengine: cleanup with list_first_entry_or_null()
The combo of list_empty() check and return list_first_entry()
can be replaced with list_first_entry_or_null().
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---
drivers/dma/coh901318.c | 22 ++++------------------
drivers/dma/ep93xx_dma.c | 6 ++----
drivers/dma/ste_dma40.c | 36 +++++-------------------------------
drivers/dma/virt-dma.h | 6 ++----
4 files changed, 13 insertions(+), 57 deletions(-)
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index e4acd63..a373eca 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -1553,15 +1553,8 @@ coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc)
static struct coh901318_desc *
coh901318_first_active_get(struct coh901318_chan *cohc)
{
- struct coh901318_desc *d;
-
- if (list_empty(&cohc->active))
- return NULL;
-
- d = list_first_entry(&cohc->active,
- struct coh901318_desc,
- node);
- return d;
+ return list_first_entry_or_null(&cohc->active, struct coh901318_desc,
+ node);
}
static void
@@ -1579,15 +1572,8 @@ coh901318_desc_queue(struct coh901318_chan *cohc, struct coh901318_desc *desc)
static struct coh901318_desc *
coh901318_first_queued(struct coh901318_chan *cohc)
{
- struct coh901318_desc *d;
-
- if (list_empty(&cohc->queue))
- return NULL;
-
- d = list_first_entry(&cohc->queue,
- struct coh901318_desc,
- node);
- return d;
+ return list_first_entry_or_null(&cohc->queue, struct coh901318_desc,
+ node);
}
static inline u32 coh901318_get_bytes_in_lli(struct coh901318_lli *in_lli)
diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
index 21f08cc..2ffaca2 100644
--- a/drivers/dma/ep93xx_dma.c
+++ b/drivers/dma/ep93xx_dma.c
@@ -262,10 +262,8 @@ static void ep93xx_dma_set_active(struct ep93xx_dma_chan *edmac,
static struct ep93xx_dma_desc *
ep93xx_dma_get_active(struct ep93xx_dma_chan *edmac)
{
- if (list_empty(&edmac->active))
- return NULL;
-
- return list_first_entry(&edmac->active, struct ep93xx_dma_desc, node);
+ return list_first_entry_or_null(&edmac->active,
+ struct ep93xx_dma_desc, node);
}
/**
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 8b18e44..e43d2bb 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -941,15 +941,7 @@ static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
static struct d40_desc *d40_first_active_get(struct d40_chan *d40c)
{
- struct d40_desc *d;
-
- if (list_empty(&d40c->active))
- return NULL;
-
- d = list_first_entry(&d40c->active,
- struct d40_desc,
- node);
- return d;
+ return list_first_entry_or_null(&d40c->active, struct d40_desc, node);
}
/* remove desc from current queue and add it to the pending_queue */
@@ -962,36 +954,18 @@ static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc)
static struct d40_desc *d40_first_pending(struct d40_chan *d40c)
{
- struct d40_desc *d;
-
- if (list_empty(&d40c->pending_queue))
- return NULL;
-
- d = list_first_entry(&d40c->pending_queue,
- struct d40_desc,
- node);
- return d;
+ return list_first_entry_or_null(&d40c->pending_queue, struct d40_desc,
+ node);
}
static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
{
- struct d40_desc *d;
-
- if (list_empty(&d40c->queue))
- return NULL;
-
- d = list_first_entry(&d40c->queue,
- struct d40_desc,
- node);
- return d;
+ return list_first_entry_or_null(&d40c->queue, struct d40_desc, node);
}
static struct d40_desc *d40_first_done(struct d40_chan *d40c)
{
- if (list_empty(&d40c->done))
- return NULL;
-
- return list_first_entry(&d40c->done, struct d40_desc, node);
+ return list_first_entry_or_null(&d40c->done, struct d40_desc, node);
}
static int d40_psize_2_burst_size(bool is_log, int psize)
diff --git a/drivers/dma/virt-dma.h b/drivers/dma/virt-dma.h
index d9731ca..a030ae7 100644
--- a/drivers/dma/virt-dma.h
+++ b/drivers/dma/virt-dma.h
@@ -123,10 +123,8 @@ static inline void vchan_cyclic_callback(struct virt_dma_desc *vd)
*/
static inline struct virt_dma_desc *vchan_next_desc(struct virt_dma_chan *vc)
{
- if (list_empty(&vc->desc_issued))
- return NULL;
-
- return list_first_entry(&vc->desc_issued, struct virt_dma_desc, node);
+ return list_first_entry_or_null(&vc->desc_issued,
+ struct virt_dma_desc, node);
}
/**
--
1.9.1
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