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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2007-09-26 23:02:52 +0100
committerJeff Garzik <jeff@garzik.org>2007-10-12 14:55:42 -0400
commit21d2c925d3da6aabf9a0b34e95787202379f682a (patch)
treeecc292c071e6d30b45e035f0e6f2ad09f79e2536 /drivers/ata/pata_atiixp.c
parent3cc3eb1148e4b2dfabf7a1dcf36fd8be1331ca95 (diff)
pata_atiixp: Audit notes on locking
Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/pata_atiixp.c')
-rw-r--r--drivers/ata/pata_atiixp.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c
index 95ed3071a0a..9623f529553 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)