linux-kernel - [PATCH] Revert "[Bluetooth] Eliminate checks for impossible conditions in IRQ handler"

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]

Date:	Mon, 14 Sep 2009 01:18:24 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michael Hennerich <michael.hennerich@...log.com>
Subject: [PATCH] Revert "[Bluetooth] Eliminate checks for impossible conditions in IRQ handler"

Commit ac019360fe3 changed the irq handler logic to BUG_ON rather than
returning IRQ_NONE when the incoming argument is invalid.  While this
works in most cases, it doesn't work when the IRQ is shared with other
devices (or when DEBUG_SHIRQ is enabled).

So revert the previous change and replace the warning message with a
comment.

Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 drivers/bluetooth/bluecard_cs.c |    4 +++-
 drivers/bluetooth/bt3c_cs.c     |    4 +++-
 drivers/bluetooth/btuart_cs.c   |    4 +++-
 drivers/bluetooth/dtl1_cs.c     |    4 +++-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/bluetooth/bluecard_cs.c b/drivers/bluetooth/bluecard_cs.c
index b0e569b..a3a8f4d 100644
--- a/drivers/bluetooth/bluecard_cs.c
+++ b/drivers/bluetooth/bluecard_cs.c
@@ -503,7 +503,9 @@ static irqreturn_t bluecard_interrupt(int irq, void *dev_inst)
 	unsigned int iobase;
 	unsigned char reg;
 
-	BUG_ON(!info->hdev);
+	if (!info || !info->hdev)
+		/* our irq handler is shared */
+		return IRQ_NONE;
 
 	if (!test_bit(CARD_READY, &(info->hw_state)))
 		return IRQ_HANDLED;
diff --git a/drivers/bluetooth/bt3c_cs.c b/drivers/bluetooth/bt3c_cs.c
index d58e22b..9a7578e 100644
--- a/drivers/bluetooth/bt3c_cs.c
+++ b/drivers/bluetooth/bt3c_cs.c
@@ -345,7 +345,9 @@ static irqreturn_t bt3c_interrupt(int irq, void *dev_inst)
 	int iir;
 	irqreturn_t r = IRQ_NONE;
 
-	BUG_ON(!info->hdev);
+	if (!info || !info->hdev)
+		/* our irq handler is shared */
+		return IRQ_NONE;
 
 	iobase = info->p_dev->io.BasePort1;
 
diff --git a/drivers/bluetooth/btuart_cs.c b/drivers/bluetooth/btuart_cs.c
index efd689a..cd9cb6c 100644
--- a/drivers/bluetooth/btuart_cs.c
+++ b/drivers/bluetooth/btuart_cs.c
@@ -295,7 +295,9 @@ static irqreturn_t btuart_interrupt(int irq, void *dev_inst)
 	int iir, lsr;
 	irqreturn_t r = IRQ_NONE;
 
-	BUG_ON(!info->hdev);
+	if (!info || !info->hdev)
+		/* our irq handler is shared */
+		return IRQ_NONE;
 
 	iobase = info->p_dev->io.BasePort1;
 
diff --git a/drivers/bluetooth/dtl1_cs.c b/drivers/bluetooth/dtl1_cs.c
index 2cc7b32..588678a 100644
--- a/drivers/bluetooth/dtl1_cs.c
+++ b/drivers/bluetooth/dtl1_cs.c
@@ -299,7 +299,9 @@ static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 	int iir, lsr;
 	irqreturn_t r = IRQ_NONE;
 
-	BUG_ON(!info->hdev);
+	if (!info || !info->hdev)
+		/* our irq handler is shared */
+		return IRQ_NONE;
 
 	iobase = info->p_dev->io.BasePort1;
 
-- 
1.6.4.2

--
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/