I/OAT: fixups from code comments

A few fixups from Andrew's code comments.
  - removed "static inline" forward-declares
  - changed use of min() to min_t()
  - removed some unnecessary NULL initializations
  - removed a couple of BUG() calls

Fixes this:

drivers/dma/ioat_dma.c: In function `ioat1_tx_submit':
drivers/dma/ioat_dma.c:177: sorry, unimplemented: inlining failed in call to '__ioat1_dma_memcpy_issue_pending': function body not available
drivers/dma/ioat_dma.c:268: sorry, unimplemented: called from here

Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Cc: "Williams, Dan J" <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index c1c2dcc..c17ec32 100644 (file)
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -173,10 +173,47 @@ static void ioat_set_dest(dma_addr_t addr,
        tx_to_ioat_desc(tx)->dst = addr;
 }
 
+/**
+ * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended
+ *                                 descriptors to hw
+ * @chan: DMA channel handle
+ */
 static inline void __ioat1_dma_memcpy_issue_pending(
-                                              struct ioat_dma_chan *ioat_chan);
+                                               struct ioat_dma_chan *ioat_chan)
+{
+       ioat_chan->pending = 0;
+       writeb(IOAT_CHANCMD_APPEND, ioat_chan->reg_base + IOAT1_CHANCMD_OFFSET);
+}
+
+static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan)
+{
+       struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+
+       if (ioat_chan->pending != 0) {
+               spin_lock_bh(&ioat_chan->desc_lock);
+               __ioat1_dma_memcpy_issue_pending(ioat_chan);
+               spin_unlock_bh(&ioat_chan->desc_lock);
+       }
+}
+
 static inline void __ioat2_dma_memcpy_issue_pending(
-                                              struct ioat_dma_chan *ioat_chan);
+                                               struct ioat_dma_chan *ioat_chan)
+{
+       ioat_chan->pending = 0;
+       writew(ioat_chan->dmacount,
+              ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
+}
+
+static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan)
+{
+       struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+
+       if (ioat_chan->pending != 0) {
+               spin_lock_bh(&ioat_chan->desc_lock);
+               __ioat2_dma_memcpy_issue_pending(ioat_chan);
+               spin_unlock_bh(&ioat_chan->desc_lock);
+       }
+}
 
 static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
 {
@@ -203,7 +240,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
        prev = to_ioat_desc(ioat_chan->used_desc.prev);
        prefetch(prev->hw);
        do {
-               copy = min((u32) len, ioat_chan->xfercap);
+               copy = min_t(size_t, len, ioat_chan->xfercap);
 
                new->async_tx.ack = 1;
 
@@ -291,10 +328,12 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx)
        orig_ack = first->async_tx.ack;
        new = first;
 
-       /* ioat_chan->desc_lock is still in force in version 2 path */
-
+       /*
+        * ioat_chan->desc_lock is still in force in version 2 path
+        * it gets unlocked at end of this function
+        */
        do {
-               copy = min((u32) len, ioat_chan->xfercap);
+               copy = min_t(size_t, len, ioat_chan->xfercap);
 
                new->async_tx.ack = 1;
 
@@ -432,7 +471,7 @@ static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat_chan)
 static int ioat_dma_alloc_chan_resources(struct dma_chan *chan)
 {
        struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
-       struct ioat_desc_sw *desc = NULL;
+       struct ioat_desc_sw *desc;
        u16 chanctrl;
        u32 chanerr;
        int i;
@@ -575,7 +614,7 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan)
 static struct ioat_desc_sw *
 ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
 {
-       struct ioat_desc_sw *new = NULL;
+       struct ioat_desc_sw *new;
 
        if (!list_empty(&ioat_chan->free_desc)) {
                new = to_ioat_desc(ioat_chan->free_desc.next);
@@ -583,9 +622,11 @@ ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
        } else {
                /* try to get another desc */
                new = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC);
-               /* will this ever happen? */
-               /* TODO add upper limit on these */
-               BUG_ON(!new);
+               if (!new) {
+                       dev_err(&ioat_chan->device->pdev->dev,
+                               "alloc failed\n");
+                       return NULL;
+               }
        }
 
        prefetch(new->hw);
@@ -595,7 +636,7 @@ ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
 static struct ioat_desc_sw *
 ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
 {
-       struct ioat_desc_sw *new = NULL;
+       struct ioat_desc_sw *new;
 
        /*
         * used.prev points to where to start processing
@@ -609,8 +650,8 @@ ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
        if (ioat_chan->used_desc.prev &&
            ioat_chan->used_desc.next == ioat_chan->used_desc.prev->prev) {
 
-               struct ioat_desc_sw *desc = NULL;
-               struct ioat_desc_sw *noop_desc = NULL;
+               struct ioat_desc_sw *desc;
+               struct ioat_desc_sw *noop_desc;
                int i;
 
                /* set up the noop descriptor */
@@ -624,10 +665,14 @@ ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
                ioat_chan->pending++;
                ioat_chan->dmacount++;
 
-               /* get a few more descriptors */
+               /* try to get a few more descriptors */
                for (i = 16; i; i--) {
                        desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC);
-                       BUG_ON(!desc);
+                       if (!desc) {
+                               dev_err(&ioat_chan->device->pdev->dev,
+                                       "alloc failed\n");
+                               break;
+                       }
                        list_add_tail(&desc->node, ioat_chan->used_desc.next);
 
                        desc->hw->next
@@ -677,10 +722,13 @@ static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy(
 
        spin_lock_bh(&ioat_chan->desc_lock);
        new = ioat_dma_get_next_descriptor(ioat_chan);
-       new->len = len;
        spin_unlock_bh(&ioat_chan->desc_lock);
 
-       return new ? &new->async_tx : NULL;
+       if (new) {
+               new->len = len;
+               return &new->async_tx;
+       } else
+               return NULL;
 }
 
 static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy(
@@ -693,53 +741,17 @@ static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy(
 
        spin_lock_bh(&ioat_chan->desc_lock);
        new = ioat2_dma_get_next_descriptor(ioat_chan);
-       new->len = len;
-
-       /* leave ioat_chan->desc_lock set in version 2 path */
-       return new ? &new->async_tx : NULL;
-}
-
-
-/**
- * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended
- *                                 descriptors to hw
- * @chan: DMA channel handle
- */
-static inline void __ioat1_dma_memcpy_issue_pending(
-                                               struct ioat_dma_chan *ioat_chan)
-{
-       ioat_chan->pending = 0;
-       writeb(IOAT_CHANCMD_APPEND, ioat_chan->reg_base + IOAT1_CHANCMD_OFFSET);
-}
-
-static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan)
-{
-       struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
-
-       if (ioat_chan->pending != 0) {
-               spin_lock_bh(&ioat_chan->desc_lock);
-               __ioat1_dma_memcpy_issue_pending(ioat_chan);
-               spin_unlock_bh(&ioat_chan->desc_lock);
-       }
-}
-
-static inline void __ioat2_dma_memcpy_issue_pending(
-                                               struct ioat_dma_chan *ioat_chan)
-{
-       ioat_chan->pending = 0;
-       writew(ioat_chan->dmacount,
-              ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
-}
 
-static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan)
-{
-       struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+       /*
+        * leave ioat_chan->desc_lock set in ioat 2 path
+        * it will get unlocked at end of tx_submit
+        */
 
-       if (ioat_chan->pending != 0) {
-               spin_lock_bh(&ioat_chan->desc_lock);
-               __ioat2_dma_memcpy_issue_pending(ioat_chan);
-               spin_unlock_bh(&ioat_chan->desc_lock);
-       }
+       if (new) {
+               new->len = len;
+               return &new->async_tx;
+       } else
+               return NULL;
 }
 
 static void ioat_dma_cleanup_tasklet(unsigned long data)
@@ -1019,7 +1031,7 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
 static void ioat_dma_test_callback(void *dma_async_param)
 {
        printk(KERN_ERR "ioatdma: ioat_dma_test_callback(%p)\n",
-                       dma_async_param);
+               dma_async_param);
 }
 
 /**
@@ -1032,7 +1044,7 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
        u8 *src;
        u8 *dest;
        struct dma_chan *dma_chan;
-       struct dma_async_tx_descriptor *tx = NULL;
+       struct dma_async_tx_descriptor *tx;
        dma_addr_t addr;
        dma_cookie_t cookie;
        int err = 0;

diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
index b668234..f2c7fed 100644 (file)
--- a/drivers/dma/ioatdma.h
+++ b/drivers/dma/ioatdma.h
@@ -76,7 +76,7 @@ struct ioat_dma_chan {
        dma_cookie_t completed_cookie;
        unsigned long last_completion;
 
-       u32 xfercap;    /* XFERCAP register value expanded out */
+       size_t xfercap; /* XFERCAP register value expanded out */
 
        spinlock_t cleanup_lock;
        spinlock_t desc_lock;