diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2019-05-02 17:43:36 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2019-05-09 17:16:41 +0100 |
| commit | 39694ed0dbe17de1eff7850e7481bef98047130c (patch) | |
| tree | c28618f706451ab29c160c4965d69abc65516870 | |
| parent | 8194468fadaaac5e04558d955e7bff8692212459 (diff) | |
ARM: riscpc: dma: make state a local variable
Make state a local variable to avoid rewriting it in the DMA loop.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
| -rw-r--r-- | arch/arm/mach-rpc/dma.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/arch/arm/mach-rpc/dma.c b/arch/arm/mach-rpc/dma.c index 37750c6493b4..e2b9c95d853b 100644 --- a/arch/arm/mach-rpc/dma.c +++ b/arch/arm/mach-rpc/dma.c @@ -99,15 +99,15 @@ static irqreturn_t iomd_dma_handle(int irq, void *dev_id) { struct iomd_dma *idma = dev_id; unsigned long base = idma->base; + unsigned int state = idma->state; + unsigned int status; do { - unsigned int status; - status = iomd_readb(base + ST); if (!(status & DMA_ST_INT)) - return IRQ_HANDLED; + goto out; - if ((idma->state ^ status) & DMA_ST_AB) + if ((state ^ status) & DMA_ST_AB) iomd_get_next_sg(idma); switch (status & (DMA_ST_OFL | DMA_ST_AB)) { @@ -115,14 +115,14 @@ static irqreturn_t iomd_dma_handle(int irq, void *dev_id) case DMA_ST_AB: /* .IB */ iomd_writel(idma->cur_addr, base + CURA); iomd_writel(idma->cur_len, base + ENDA); - idma->state = DMA_ST_AB; + state = DMA_ST_AB; break; case DMA_ST_OFL | DMA_ST_AB: /* OIB */ case 0: /* .IA */ iomd_writel(idma->cur_addr, base + CURB); iomd_writel(idma->cur_len, base + ENDB); - idma->state = 0; + state = 0; break; } @@ -131,9 +131,10 @@ static irqreturn_t iomd_dma_handle(int irq, void *dev_id) break; } while (1); - idma->state = ~DMA_ST_AB; + state = ~DMA_ST_AB; disable_irq_nosync(irq); - +out: + idma->state = state; return IRQ_HANDLED; } |