Messages in this thread Patch in this message | | | From | Greg KH <> | Subject | [PATCH 44/49] Staging: poch: Fine grained locking | Date | Wed, 29 Oct 2008 15:40:11 -0700 |
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From: vijaykumar@bravegnu.org <vijaykumar@bravegnu.org>
Lock only the portion of code that does register access.
Signed-off-by: Vijay Kumar <vijaykumar@bravegnu.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/staging/poch/poch.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/poch/poch.c b/drivers/staging/poch/poch.c index 3ecbd7c..1f14792 100644 --- a/drivers/staging/poch/poch.c +++ b/drivers/staging/poch/poch.c @@ -485,27 +485,30 @@ static void channel_dma_init(struct channel_info *channel) /* The DMA address page register is shared between the RX and * TX channels, so acquire lock. */ - spin_lock(channel->iomem_lock); for (i = 0; i < channel->group_count; i++) { page = i / 32; group_in_page = i % 32; group_reg = group_regs_base + (group_in_page * 4); + spin_lock(channel->iomem_lock); iowrite32(page, fpga + FPGA_DMA_ADR_PAGE_REG); iowrite32(channel->groups[i].dma_addr, fpga + group_reg); + spin_unlock(channel->iomem_lock); } + for (i = 0; i < channel->group_count; i++) { page = i / 32; group_in_page = i % 32; group_reg = group_regs_base + (group_in_page * 4); + spin_lock(channel->iomem_lock); iowrite32(page, fpga + FPGA_DMA_ADR_PAGE_REG); printk(KERN_INFO PFX "%ld: read dma_addr: 0x%x\n", i, ioread32(fpga + group_reg)); + spin_unlock(channel->iomem_lock); } - spin_unlock(channel->iomem_lock); } -- 1.6.0.2
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