[PATCH RFC 35/51] DMA-API: parport: parport_pc.c: use dma_coerce_mask_and_coherent()
From: Russell King <hidden>
Date: 2013-08-01 22:09:42
Also in:
lkml
Subsystem:
parallel port subsystem, the rest · Maintainers:
Sudip Mukherjee, Linus Torvalds
The code sequence: dev->coherent_dma_mask = DMA_BIT_MASK(24); dev->dma_mask = &dev->coherent_dma_mask; bypasses the architectures check on the DMA mask. It can be replaced with dma_coerce_mask_and_coherent(), avoiding the direct initialization of this mask. Signed-off-by: Russell King <redacted> --- drivers/parport/parport_pc.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index 903e128..9637615 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c@@ -2004,6 +2004,7 @@ struct parport *parport_pc_probe_port(unsigned long int base, struct resource *ECR_res = NULL; struct resource *EPP_res = NULL; struct platform_device *pdev = NULL; + int ret; if (!dev) { /* We need a physical device to attach to, but none was
@@ -2014,8 +2015,11 @@ struct parport *parport_pc_probe_port(unsigned long int base, return NULL; dev = &pdev->dev; - dev->coherent_dma_mask = DMA_BIT_MASK(24); - dev->dma_mask = &dev->coherent_dma_mask; + ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(24)); + if (ret) { + dev_err(dev, "Unable to set coherent dma mask: disabling DMA\n"); + dma = PARPORT_DMA_NONE; + } } ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
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1.7.4.4