From 2a3917a8bb40a2cb75b458da9c356e8557e8fbed Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 15 May 2006 20:58:30 +0900 Subject: [PATCH] [PATCH] ahci: add PIOS interim interrupt handling During multiblock PIO, multiple PIOS interrupts are generated before qc compltion. Current code prints unnecessary message for such cases. This is exposed when new EH slows down attached device into PIO mode. Signed-off-by: Tejun Heo --- drivers/scsi/ahci.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c index d6894bd67980..35487e30b0ff 100644 --- a/drivers/scsi/ahci.c +++ b/drivers/scsi/ahci.c @@ -883,7 +883,18 @@ static void ahci_host_intr(struct ata_port *ap) } } - /* spurious interrupt */ + /* hmmm... a spurious interupt */ + + /* ignore interim PIO setup fis interrupts */ + if (ata_tag_valid(ap->active_tag)) { + struct ata_queued_cmd *qc = + ata_qc_from_tag(ap, ap->active_tag); + + if (qc && qc->tf.protocol == ATA_PROT_PIO && + (status & PORT_IRQ_PIOS_FIS)) + return; + } + if (ata_ratelimit()) ata_port_printk(ap, KERN_INFO, "spurious interrupt " "(irq_stat 0x%x active_tag %d)\n",