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>

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index d22d628..b721ed2 100644 (file)
--- 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
                 */