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authorTomasz Figa <tomasz.figa@gmail.com>2013-08-11 19:59:13 +0200
committerVinod Koul <vinod.koul@intel.com>2013-09-02 11:49:56 +0530
commit68a7faa2006c022468adec11549b8b5e0a0f284a (patch)
tree2e9a5aa59ff459d0372870ccbf74ee4b633201ea /drivers/dma
parent39ff86130a36cb5779102832dec39abecebfc316 (diff)
dmaengine: PL08x: Refactor pl08x_getbytes_chan() to lower indentation
Further patch will introduce support for PL080S, which requires some things to be done conditionally, thus increasing indentation level of some functions even more. This patch reduces indentation level of pl08x_getbytes_chan() function by inverting several conditions and returning from function wherever possible. Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/amba-pl08x.c53
1 files changed, 29 insertions, 24 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 06fe45c74de..6a12392bfa9 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -469,47 +469,52 @@ static inline u32 get_bytes_in_cctl(u32 cctl)
/* The channel should be paused when calling this */
static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
{
+ struct pl08x_lli *llis_va;
struct pl08x_phy_chan *ch;
+ dma_addr_t llis_bus;
struct pl08x_txd *txd;
- size_t bytes = 0;
+ size_t bytes;
+ int index;
+ u32 clli;
ch = plchan->phychan;
txd = plchan->at;
+ if (!ch || !txd)
+ return 0;
+
/*
* Follow the LLIs to get the number of remaining
* bytes in the currently active transaction.
*/
- if (ch && txd) {
- u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2;
+ clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2;
- /* First get the remaining bytes in the active transfer */
- bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL));
+ /* First get the remaining bytes in the active transfer */
+ bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL));
- if (clli) {
- struct pl08x_lli *llis_va = txd->llis_va;
- dma_addr_t llis_bus = txd->llis_bus;
- int index;
+ if (!clli)
+ return bytes;
- BUG_ON(clli < llis_bus || clli >= llis_bus +
+ llis_va = txd->llis_va;
+ llis_bus = txd->llis_bus;
+
+ BUG_ON(clli < llis_bus || clli >= llis_bus +
sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS);
- /*
- * Locate the next LLI - as this is an array,
- * it's simple maths to find.
- */
- index = (clli - llis_bus) / sizeof(struct pl08x_lli);
+ /*
+ * Locate the next LLI - as this is an array,
+ * it's simple maths to find.
+ */
+ index = (clli - llis_bus) / sizeof(struct pl08x_lli);
- for (; index < MAX_NUM_TSFR_LLIS; index++) {
- bytes += get_bytes_in_cctl(llis_va[index].cctl);
+ for (; index < MAX_NUM_TSFR_LLIS; index++) {
+ bytes += get_bytes_in_cctl(llis_va[index].cctl);
- /*
- * A LLI pointer of 0 terminates the LLI list
- */
- if (!llis_va[index].lli)
- break;
- }
- }
+ /*
+ * A LLI pointer of 0 terminates the LLI list
+ */
+ if (!llis_va[index].lli)
+ break;
}
return bytes;