netdev - Re: [PATCH 00/11] DMA sync errors

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Message-ID: <20100120152832.06a905a5@nehalam>
Date:	Wed, 20 Jan 2010 15:28:32 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	jarkao2@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH 00/11] DMA sync errors

This should fix the dma-debug API code (and documentation), to
avoid false positives when sync is done on a partial map.

Signed-off-by: Stephen Hemminger <shemminger@...tta.com>

--- a/Documentation/DMA-API.txt	2010-01-20 15:17:01.390143729 -0800
+++ b/Documentation/DMA-API.txt	2010-01-20 15:18:48.967875255 -0800
@@ -377,9 +377,10 @@ void
 pci_dma_sync_sg(struct pci_dev *hwdev, struct scatterlist *sg,
 		       int nelems, int direction)
 
-Synchronise a single contiguous or scatter/gather mapping.  All the
-parameters must be the same as those passed into the single mapping
-API.
+Synchronise a single contiguous or scatter/gather mapping.  The
+device and handle must be the same as those passed into the single mapping
+API. The size can be less than the original mapping if only part
+of the mapping needs to be accessed.
 
 Notes:  You must do this:
 
--- a/lib/dma-debug.c	2010-01-20 15:22:55.919519883 -0800
+++ b/lib/dma-debug.c	2010-01-20 15:26:31.648895638 -0800
@@ -285,11 +285,9 @@ static struct dma_debug_entry *hash_buck
 	}
 
 	/*
-	 * If we have multiple matches but no perfect-fit, just return
-	 * NULL.
+	 * If we have multiple matches but no perfect-fit
+	 * return best value and let caller deal with it.
 	 */
-	ret = (matches == 1) ? ret : NULL;
-
 	return ret;
 }
 
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