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* [PATCH] pata_atiixp: Audit notes on locking
@ 2007-09-26 22:02 Alan Cox
  2007-09-29  6:22 ` Jeff Garzik
  0 siblings, 1 reply; 2+ messages in thread
From: Alan Cox @ 2007-09-26 22:02 UTC (permalink / raw)
  To: akpm, linux-kernel, jeff

Signed-off-by: Alan Cox <alan@redhat.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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2007-09-26 22:02 [PATCH] pata_atiixp: Audit notes on locking Alan Cox
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