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authorTejun Heo <htejun@gmail.com>2007-05-01 09:50:15 (GMT)
committerJeff Garzik <jeff@garzik.org>2007-05-11 22:09:18 (GMT)
commitf4d6d00466ef4879e4289f18c2f59210a06a7ada (patch)
tree60a0ec3c2872f1f21c2b546af3e04990b3bfa60b /drivers
parent1626aeb881236c8cb022b5e4ca594146a951d669 (diff)
downloadlinux-f4d6d00466ef4879e4289f18c2f59210a06a7ada.tar.xz
libata: ignore EH scheduling during initialization
libata enables SCSI host during ATA host activation which happens after IRQ handler is registered and IRQ is enabled. All ATA ports are in frozen state when IRQ is enabled but frozen ports may raise limited number of IRQs after being frozen - IOW, ->freeze() is not responsible for clearing pending IRQs. During normal operation, the IRQ handler is responsible for clearing spurious IRQs on frozen ports and it usually doesn't require any extra code. Unfortunately, during host initialization, the IRQ handler can end up scheduling EH for a port whose SCSI host isn't initialized yet. This results in OOPS in the SCSI midlayer. This is relatively short window and scheduling EH for probing is the first thing libata does after initialization, so ignoring EH scheduling until initialization is complete solves the problem nicely. This problem was spotted by Berck E. Nash in the following thread. http://thread.gmane.org/gmane.linux.kernel/519412 Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Berck E. Nash <flyboy@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ata/libata-core.c2
-rw-r--r--drivers/ata/libata-eh.c3
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9cff5c5..6ac4f32 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5964,6 +5964,7 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
if (!ap)
return NULL;
+ ap->pflags |= ATA_PFLAG_INITIALIZING;
ap->lock = &host->lock;
ap->flags = ATA_FLAG_DISABLED;
ap->print_id = -1;
@@ -6332,6 +6333,7 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
ehi->action |= ATA_EH_SOFTRESET;
ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
+ ap->pflags &= ~ATA_PFLAG_INITIALIZING;
ap->pflags |= ATA_PFLAG_LOADING;
ata_port_schedule_eh(ap);
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 412d604..ee9bb53 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -551,6 +551,9 @@ void ata_port_schedule_eh(struct ata_port *ap)
{
WARN_ON(!ap->ops->error_handler);
+ if (ap->pflags & ATA_PFLAG_INITIALIZING)
+ return;
+
ap->pflags |= ATA_PFLAG_EH_PENDING;
scsi_schedule_eh(ap->scsi_host);