[PATCH 3/4] dma-debug: add dma_debug_driver kernel command line

[Joerg Roedel <joerg.roedel@amd.com>]

This patch add the dma_debug_driver= boot parameter to enable the driver
filter for early boot.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 lib/dma-debug.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 65043c7..7b51fa4 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -1098,3 +1098,22 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 }
 EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
 
+static int __init parse_dma_debug_driver(char *str)
+{
+	int i;
+
+	for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
+		current_driver_name[i] = *str;
+		if (*str == ' ' || *str == '\t' || isspace(*str) || *str == 0)
+			break;
+	}
+	current_driver_name[i] = 0;
+
+	if (current_driver_name[0])
+		printk(KERN_INFO "DMA-API: enable driver filter for "
+				 "driver [%s]\n", current_driver_name);
+
+
+	return 1;
+}
+__setup("dma_debug_driver=", parse_dma_debug_driver);
-- 
1.6.3.1