linux-kernel - [PATCH] pata_atiixp: Audit notes on locking

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Message-ID: <20070926230252.45fb49d5@the-village.bc.nu>
Date:	Wed, 26 Sep 2007 23:02:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	akpm@...l.org, linux-kernel@...r.kernel.org, jeff@...zik.org
Subject: [PATCH] pata_atiixp: Audit notes on locking

Signed-off-by: Alan Cox <alan@...hat.com>

diff -u --new-file --exclude-from /usr/src/exclude --recursive linux.vanilla-2.6.23rc8-mm1/drivers/ata/pata_atiixp.c linux-2.6.23rc8-mm1/drivers/ata/pata_atiixp.c
--- linux.vanilla-2.6.23rc8-mm1/drivers/ata/pata_atiixp.c	2007-09-26 16:46:48.000000000 +0100
+++ linux-2.6.23rc8-mm1/drivers/ata/pata_atiixp.c	2007-09-25 23:59:17.000000000 +0100
@@ -173,6 +173,9 @@
  *
  *	When DMA begins we need to ensure that the UDMA control
  *	register for the channel is correctly set.
+ *
+ *	Note: The host lock held by the libata layer protects
+ *	us from two channels both trying to set DMA bits at once
  */
 
 static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
@@ -199,6 +202,9 @@
  *
  *	DMA has completed. Clear the UDMA flag as the next operations will
  *	be PIO ones not UDMA data transfer.
+ *
+ *	Note: The host lock held by the libata layer protects
+ *	us from two channels both trying to set DMA bits at once
  */
 
 static void atiixp_bmdma_stop(struct ata_queued_cmd *qc)
-
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