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From: Alexander Motin <mav@FreeBSD.org>
Date: Sun, 17 Jul 2016 12:45:58 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r302947 - head/sys/dev/ahci
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Author: mav
Date: Sun Jul 17 12:45:58 2016
New Revision: 302947
URL: https://svnweb.freebsd.org/changeset/base/302947

Log:
  In AHCI_IRQ_MODE_AFTER mode do not clear interrupts below.
  
  This is probably a NOP change since IS register is not activery used for
  interrupts below the shared, but it looked odd to clear interrupts we did
  not handle.

Modified:
  head/sys/dev/ahci/ahci.c

Modified: head/sys/dev/ahci/ahci.c
==============================================================================
--- head/sys/dev/ahci/ahci.c	Sun Jul 17 12:31:31 2016	(r302946)
+++ head/sys/dev/ahci/ahci.c	Sun Jul 17 12:45:58 2016	(r302947)
@@ -466,6 +466,7 @@ ahci_intr(void *data)
 	} else {	/* AHCI_IRQ_MODE_AFTER */
 		unit = irq->r_irq_rid - 1;
 		is = ATA_INL(ctlr->r_mem, AHCI_IS);
+		is &= (0xffffffff << unit);
 	}
 	/* CCC interrupt is edge triggered. */
 	if (ctlr->ccc)