dma: pl330: fix a couple of compilation warnings

Move a couple of tests and do a minor refactor to avoid:

drivers/dma/pl330.c: In function 'pl330_probe':
drivers/dma/pl330.c:2929:215: warning: comparison of distinct pointer types lacks a cast [enabled by default]
drivers/dma/pl330.c: In function 'pl330_tasklet':
drivers/dma/pl330.c:2250:8: warning: 'pch' may be used uninitialized in this function [-Wuninitialized]
drivers/dma/pl330.c:2228:25: note: 'pch' was declared here
drivers/dma/pl330.c:2277:130: warning: 'pch' may be used uninitialized in this function [-Wuninitialized]
drivers/dma/pl330.c:2260:25: note: 'pch' was declared here

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

1 files changed, 15 insertions, 10 deletions

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 282caf118be8..2ee6e23930ad 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2225,12 +2225,9 @@ static inline void free_desc_list(struct list_head *list)
 {
         struct dma_pl330_dmac *pdmac;
         struct dma_pl330_desc *desc;
-        struct dma_pl330_chan *pch;
+        struct dma_pl330_chan *pch = NULL;
         unsigned long flags;
 
-        if (list_empty(list))
-                return;
-
         /* Finish off the work list */
         list_for_each_entry(desc, list, node) {
                 dma_async_tx_callback callback;
@@ -2247,6 +2244,10 @@ static inline void free_desc_list(struct list_head *list)
                 desc->pchan = NULL;
         }
 
+        /* pch will be unset if list was empty */
+        if (!pch)
+                return;
+
         pdmac = pch->dmac;
 
         spin_lock_irqsave(&pdmac->pool_lock, flags);
@@ -2257,12 +2258,9 @@ static inline void free_desc_list(struct list_head *list)
 static inline void handle_cyclic_desc_list(struct list_head *list)
 {
         struct dma_pl330_desc *desc;
-        struct dma_pl330_chan *pch;
+        struct dma_pl330_chan *pch = NULL;
         unsigned long flags;
 
-        if (list_empty(list))
-                return;
-
         list_for_each_entry(desc, list, node) {
                 dma_async_tx_callback callback;
 
@@ -2274,6 +2272,10 @@ static inline void handle_cyclic_desc_list(struct list_head *list)
                         callback(desc->txd.callback_param);
         }
 
+        /* pch will be unset if list was empty */
+        if (!pch)
+                return;
+
         spin_lock_irqsave(&pch->lock, flags);
         list_splice_tail_init(list, &pch->work_list);
         spin_unlock_irqrestore(&pch->lock, flags);
@@ -2926,8 +2928,11 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
         INIT_LIST_HEAD(&pd->channels);
 
         /* Initialize channel parameters */
-        num_chan = max(pdat ? pdat->nr_valid_peri : (u8)pi->pcfg.num_peri,
-                        (u8)pi->pcfg.num_chan);
+        if (pdat)
+                num_chan = max_t(int, pdat->nr_valid_peri, pi->pcfg.num_chan);
+        else
+                num_chan = max_t(int, pi->pcfg.num_peri, pi->pcfg.num_chan);
+
         pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
 
         for (i = 0; i < num_chan; i++) {