Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=21d2c925d3da6aabf9a0b34e95787202379f682a
Commit: 21d2c925d3da6aabf9a0b34e95787202379f682a
Parent: 3cc3eb1148e4b2dfabf7a1dcf36fd8be1331ca95
Author: Alan Cox <[EMAIL PROTECTED]>
AuthorDate: Wed Sep 26 23:02:52 2007 +0100
Committer: Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Fri Oct 12 14:55:42 2007 -0400
pata_atiixp: Audit notes on locking
Signed-off-by: Alan Cox <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
drivers/ata/pata_atiixp.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c
index 95ed307..9623f52 100644
--- a/drivers/ata/pata_atiixp.c
+++ b/drivers/ata/pata_atiixp.c
@@ -173,6 +173,9 @@ static void atiixp_set_dmamode(struct ata_port *ap, struct
ata_device *adev)
*
* 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 @@ static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
*
* 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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