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authorTejun Heo <htejun@gmail.com>2007-12-07 18:45:27 -0500
committerJeff Garzik <jeff@garzik.org>2007-12-17 20:33:11 -0500
commit8cf32ac6578a70025be1103466da9d1d6141429e (patch)
treeb77386f566db1d0a71bb0e7cbf2a69fd2ed9df5e /drivers/ata/sata_sil.c
parent2cc3a8f6ac0fb1e6095a47001d31aadcf9722bde (diff)
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.c29
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)
390 sil_scr_read(ap, SCR_ERROR, &serror); 390 sil_scr_read(ap, SCR_ERROR, &serror);
391 sil_scr_write(ap, SCR_ERROR, serror); 391 sil_scr_write(ap, SCR_ERROR, serror);
392 392
393 /* Trigger hotplug and accumulate SError only if the 393 /* Sometimes spurious interrupts occur, double check
394 * port isn't already frozen. Otherwise, PHY events 394 * it's PHYRDY CHG.
395 * during hardreset makes controllers with broken SIEN
396 * repeat probing needlessly.
397 */ 395 */
398 if (!(ap->pflags & ATA_PFLAG_FROZEN)) { 396 if (serror & SERR_PHYRDY_CHG) {
399 ata_ehi_hotplugged(&ap->link.eh_info); 397 /* Trigger hotplug and accumulate SError only
400 ap->link.eh_info.serror |= serror; 398 * if the port isn't already frozen.
399 * Otherwise, PHY events during hardreset
400 * makes controllers with broken SIEN repeat
401 * probing needlessly.
402 */
403 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
404 ata_ehi_hotplugged(&ap->link.eh_info);
405 ap->link.eh_info.serror |= serror;
406 }
407 goto freeze;
401 } 408 }
402 409
403 goto freeze; 410 if (!(bmdma2 & SIL_DMA_COMPLETE))
411 return;
404 } 412 }
405 413
406 if (unlikely(!qc)) 414 if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
407 goto freeze;
408
409 if (unlikely(qc->tf.flags & ATA_TFLAG_POLLING)) {
410 /* this sometimes happens, just clear IRQ */ 415 /* this sometimes happens, just clear IRQ */
411 ata_chk_status(ap); 416 ata_chk_status(ap);
412 return; 417 return;