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[libata sata_mv] handle lack of hardware nIEN support

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Handle errata (it was unintentional on this h/w, whereas its intentional
on others) whereby the nIEN bit in Device Control is ignored, leading to
a situation where a hardware interrupt completes the qc before the
polling code has a chance to.

This will get fixed The Right Way(tm) once Albert Lee's irq-pio
branch is merged, as the more natural PIO method on this hardware is
interrupt-driven.
This commit is contained in:
Jeff Garzik 2005-11-17 05:44:44 -05:00
parent 22374677d1
commit a2c91a8819
1 changed files with 6 additions and 1 deletions
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5
drivers/scsi/sata_mv.c
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@ -1219,6 +1219,10 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
handled++;
}
if (ap &&
(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR)))
continue;
err_mask = ac_err_mask(ata_status);
shift = port << 1; /* (port * 2) */
@ -1237,6 +1241,7 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
VPRINTK("port %u IRQ found for qc, "
"ata_status 0x%x\n", port,ata_status);
/* mark qc status appropriately */
if (!(qc->tf.ctl & ATA_NIEN))
ata_qc_complete(qc, err_mask);
}
}