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authorTejun Heo <tj@kernel.org>2010-05-10 21:41:30 +0200
committerJeff Garzik <jgarzik@redhat.com>2010-05-17 22:49:02 -0400
commit3e4ec3443f70fbe144799ccf0b1c3797f78d1715 (patch)
treecfb297e42075baacbbabfb6034e3e7c9a44c73b2 /drivers/ata/libata-sff.c
parentc7a8209f766961eea4cfc6f22d2d6e06ef63546c (diff)
downloadop-kernel-dev-3e4ec3443f70fbe144799ccf0b1c3797f78d1715.zip
op-kernel-dev-3e4ec3443f70fbe144799ccf0b1c3797f78d1715.tar.gz
libata: kill ATA_FLAG_DISABLED
ATA_FLAG_DISABLED is only used by drivers which don't use ->error_handler framework and is largely broken. Its only meaningful function is to make irq handlers skip processing if the flag is set, which is largely useless and even harmful as it makes those ports more likely to cause IRQ storms. Kill ATA_FLAG_DISABLED and makes the callers disable attached devices instead. ata_port_probe() and ata_port_disable() which manipulate the flag are also killed. This simplifies condition check in IRQ handlers. While updating IRQ handlers, remove ap NULL check as libata guarantees consecutive port allocation (unoccupied ports are initialized with dummies) and long-obsolete ATA_QCFLAG_ACTIVE check (checked by ata_qc_from_tag()). Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata-sff.c')
-rw-r--r--drivers/ata/libata-sff.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index d5dd88d..0e2c972 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -1807,9 +1807,6 @@ retry:
struct ata_port *ap = host->ports[i];
struct ata_queued_cmd *qc;
- if (unlikely(ap->flags & ATA_FLAG_DISABLED))
- continue;
-
qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc) {
if (!(qc->tf.flags & ATA_TFLAG_POLLING))
@@ -1884,11 +1881,8 @@ void ata_sff_lost_interrupt(struct ata_port *ap)
/* Only one outstanding command per SFF channel */
qc = ata_qc_from_tag(ap, ap->link.active_tag);
- /* Check we have a live one.. */
- if (qc == NULL || !(qc->flags & ATA_QCFLAG_ACTIVE))
- return;
- /* We cannot lose an interrupt on a polled command */
- if (qc->tf.flags & ATA_TFLAG_POLLING)
+ /* We cannot lose an interrupt on a non-existent or polled command */
+ if (!qc || qc->tf.flags & ATA_TFLAG_POLLING)
return;
/* See if the controller thinks it is still busy - if so the command
isn't a lost IRQ but is still in progress */
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