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sata_sil: ignore and clear spurious IRQs while executing commands by polling 

sata_sil used to trigger HSM error if IRQ occurs during polling
command.  This didn't matter because polling wasn't used in sata_sil.
However, as of 2.6.20, all IDENTIFYs are performed by polling and
device detection sometimes fails due to spurious IRQ.  This patch
makes sata_sil ignore and clear spurious IRQ while executing commands
by polling.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-02-24 22:30:36 +09:00 committed by Jeff Garzik
parent 6a59dcf867
commit e2f8fb7214
1 changed files with 7 additions and 1 deletions
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8
drivers/ata/sata_sil.c
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@ -386,9 +386,15 @@ static void sil_host_intr(struct ata_port *ap, u32 bmdma2)
goto freeze;
}
if (unlikely(!qc || qc->tf.ctl & ATA_NIEN))
if (unlikely(!qc))
goto freeze;
if (unlikely(qc->tf.flags & ATA_TFLAG_POLLING)) {
/* this sometimes happens, just clear IRQ */
ata_chk_status(ap);
return;
}
/* Check whether we are expecting interrupt in this state */
switch (ap->hsm_task_state) {
case HSM_ST_FIRST: