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authorRussell King - ARM Linux <linux@arm.linux.org.uk>2011-01-03 22:34:27 +0000
committerDan Williams <dan.j.williams@intel.com>2011-01-04 19:16:11 -0800
commitad0a3ad33c96cbba98ba62116771fb836c551e60 (patch)
tree7d91cc40d91bf63f6bfd0023c114fcc8d549700e /drivers/dma
parent730404ac1c47403af67420705980c99e90bf182f (diff)
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ARM: PL08x: remove unnecessary NULL and BUG checks
The tasklet always is initialized with a non-NULL data argument. It is not possible for it to be called with a NULL data argument (unless something is very wrong in the tasklet code - in which case lots of stuff will break). Therefore, as plchan can never be NULL, remove this unnecessary BUG check. In pl08x_tasklet(), we've already dereferenced plchan->at, so it can't be NULL here. Remove this unnecessary BUG check. pl08x_fill_llis_for_desc() and pl08x_free_txd() are always called with a non-NULL txd argument - either as a consequence of the code paths or as a result of other checks already in place. We don't need to repeat the non-NULL check in these functions. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/amba-pl08x.c21
1 files changed, 0 insertions, 21 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index d22d628..b721ed2 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -623,11 +623,6 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
struct lli *llis_va;
struct lli *llis_bus;
- if (!txd) {
- dev_err(&pl08x->adev->dev, "%s no descriptor\n", __func__);
- return 0;
- }
-
txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT,
&txd->llis_bus);
if (!txd->llis_va) {
@@ -993,11 +988,6 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
struct pl08x_txd *txd)
{
- if (!txd)
- dev_err(&pl08x->adev->dev,
- "%s no descriptor to free\n",
- __func__);
-
/* Free the LLI */
dma_pool_free(pl08x->pool, txd->llis_va,
txd->llis_bus);
@@ -1633,9 +1623,6 @@ static void pl08x_tasklet(unsigned long data)
struct pl08x_driver_data *pl08x = plchan->host;
unsigned long flags;
- if (!plchan)
- BUG();
-
spin_lock_irqsave(&plchan->lock, flags);
if (plchan->at) {
@@ -1656,14 +1643,6 @@ static void pl08x_tasklet(unsigned long data)
callback(callback_param);
/*
- * Device callbacks should NOT clear
- * the current transaction on the channel
- * Linus: sometimes they should?
- */
- if (!plchan->at)
- BUG();
-
- /*
* Free the descriptor if it's not for a device
* using a circular buffer
*/