diff options
| author | Tejun Heo <htejun@gmail.com> | 2007-12-08 08:45:27 +0900 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-12-17 20:33:11 -0500 |
| commit | 8cf32ac6578a70025be1103466da9d1d6141429e (patch) | |
| tree | b77386f566db1d0a71bb0e7cbf2a69fd2ed9df5e /drivers/ata/sata_sil.c | |
| parent | 2cc3a8f6ac0fb1e6095a47001d31aadcf9722bde (diff) | |
| download | linux-stable-8cf32ac6578a70025be1103466da9d1d6141429e.tar.gz linux-stable-8cf32ac6578a70025be1103466da9d1d6141429e.tar.bz2 linux-stable-8cf32ac6578a70025be1103466da9d1d6141429e.zip | |
sata_sil: fix spurious IRQ handling
Interestingly, sata_sil raises spurious interrupts if it's coupled
with Sil SATA_PATA bridge. Currently, sata_sil interrupt handler is
strict about spurious interrupts and freezes the port when it occurs.
This patch makes it more forgiving.
* On SATA PHY event interrupt, serror value is checked to see whether
it really is PHYRDY CHG event. If not, SATA PHY event interrupt is
ignored.
* If ATA interrupt occurs while no command is in progress, it's
cleared and ignored.
This fixes bugzilla bug 9505.
http://bugzilla.kernel.org/show_bug.cgi?id=9505
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/sata_sil.c')
| -rw-r--r-- | drivers/ata/sata_sil.c | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c index 4e6e381279cc..025622b14efb 100644 --- a/drivers/ata/sata_sil.c +++ b/drivers/ata/sata_sil.c @@ -390,23 +390,28 @@ static void sil_host_intr(struct ata_port *ap, u32 bmdma2) sil_scr_read(ap, SCR_ERROR, &serror); sil_scr_write(ap, SCR_ERROR, serror); - /* Trigger hotplug and accumulate SError only if the - * port isn't already frozen. Otherwise, PHY events - * during hardreset makes controllers with broken SIEN - * repeat probing needlessly. + /* Sometimes spurious interrupts occur, double check + * it's PHYRDY CHG. */ - if (!(ap->pflags & ATA_PFLAG_FROZEN)) { - ata_ehi_hotplugged(&ap->link.eh_info); - ap->link.eh_info.serror |= serror; + if (serror & SERR_PHYRDY_CHG) { + /* Trigger hotplug and accumulate SError only + * if the port isn't already frozen. + * Otherwise, PHY events during hardreset + * makes controllers with broken SIEN repeat + * probing needlessly. + */ + if (!(ap->pflags & ATA_PFLAG_FROZEN)) { + ata_ehi_hotplugged(&ap->link.eh_info); + ap->link.eh_info.serror |= serror; + } + goto freeze; } - goto freeze; + if (!(bmdma2 & SIL_DMA_COMPLETE)) + return; } - if (unlikely(!qc)) - goto freeze; - - if (unlikely(qc->tf.flags & ATA_TFLAG_POLLING)) { + if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) { /* this sometimes happens, just clear IRQ */ ata_chk_status(ap); return; |