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.
This fixes bug#7996 and IMHO should also be included in -stable.
Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
Cc: Jeff Garzik <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
drivers/ata/sata_sil.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- linux-2.6.20.1.orig/drivers/ata/sata_sil.c
+++ linux-2.6.20.1/drivers/ata/sata_sil.c
@@ -383,9 +383,15 @@ static void sil_host_intr(struct ata_por
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:
--
-
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