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authorStuart MENEFY <stuart.menefy@st.com>2009-03-10 11:38:13 +0000
committerJeff Garzik <jgarzik@redhat.com>2009-03-13 14:55:58 -0400
commite3e4385f6181f434c0d786998ad1d0eef4e21c9b (patch)
treeb5195b312ca7acebe99d0125e60fcc4eebb7e458 /drivers/ata
parent9d51af7bd2f1d730cb6eeeb9ff837e3441ad4e07 (diff)
downloadop-kernel-dev-e3e4385f6181f434c0d786998ad1d0eef4e21c9b.zip
op-kernel-dev-e3e4385f6181f434c0d786998ad1d0eef4e21c9b.tar.gz
libata: Keep shadow last_ctl up to date during resets
libata keeps a shadow copy of the ATA CTL register (which is write only), and only writes to the hardware when the required value doesn't match the shadow. However this copy wasn't being maintained when performing reset functions. This could cause problems for the first operation after a reset when the correct value might not be written to the CTL register. This problem was observed when hotplugging a drive: the identify command was being issued with interrupts enabled, when they should have been disabled. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-sff.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 714cb04..f93dc02 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -2066,6 +2066,7 @@ static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
udelay(20); /* FIXME: flush */
iowrite8(ap->ctl, ioaddr->ctl_addr);
+ ap->last_ctl = ap->ctl;
/* wait the port to become ready */
return ata_sff_wait_after_reset(&ap->link, devmask, deadline);
@@ -2190,8 +2191,10 @@ void ata_sff_postreset(struct ata_link *link, unsigned int *classes)
}
/* set up device control */
- if (ap->ioaddr.ctl_addr)
+ if (ap->ioaddr.ctl_addr) {
iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
+ ap->last_ctl = ap->ctl;
+ }
}
EXPORT_SYMBOL_GPL(ata_sff_postreset);
@@ -2534,6 +2537,7 @@ void ata_bus_reset(struct ata_port *ap)
if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
/* set up device control for ATA_FLAG_SATA_RESET */
iowrite8(ap->ctl, ioaddr->ctl_addr);
+ ap->last_ctl = ap->ctl;
}
DPRINTK("EXIT\n");
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