linux-kernel - [PATCH, RESEND] microblaze: Fix level interrupt ACKing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1258469019-3863-1-git-send-email-steve@digidescorp.com>
Date:	Tue, 17 Nov 2009 08:43:39 -0600
From:	steve@...idescorp.com
To:	microblaze-uclinux@...e.uq.edu.au
Cc:	monstr@...str.eu, linux-kernel@...r.kernel.org,
	"Steven J. Magnani" <steve@...idescorp.com>
Subject: [PATCH, RESEND] microblaze: Fix level interrupt ACKing

Level interrupts need to be ack'd in the unmask handler, as in powerpc. 
Among other issues, this bug causes the system clock to appear to run at 
double-speed.

Signed-off-by: Steven J. Magnani <steve@...idescorp.com>
---
diff -uprN a/arch/microblaze/kernel/intc.c b/arch/microblaze/kernel/intc.c
--- a/arch/microblaze/kernel/intc.c	2009-06-02 15:26:28.000000000 -0500
+++ b/arch/microblaze/kernel/intc.c	2009-06-02 15:27:39.000000000 -0500
@@ -41,8 +41,16 @@ unsigned int nr_irq;
 
 static void intc_enable_or_unmask(unsigned int irq)
 {
+	unsigned long mask = 1 << irq;
 	pr_debug("enable_or_unmask: %d\n", irq);
-	out_be32(INTC_BASE + SIE, 1 << irq);
+	out_be32(INTC_BASE + SIE, mask);
+
+	/* ack level irqs because they can't be acked during
+	 * ack function since the handle_level_irq function
+	 * acks the irq before calling the interrupt handler
+	 */
+	if (irq_desc[irq].status & IRQ_LEVEL)
+		out_be32(INTC_BASE + IAR, mask);
 }
 
 static void intc_disable_or_mask(unsigned int irq)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/