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

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

[Mike Frysinger]

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@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.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

Re: [PATCH] Revert "[Bluetooth] Eliminate checks for impossible conditions in IRQ handler"

[Marcel Holtmann]

Hi Mike,

> 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.

please don't use git revert here. Send an updated patch that fixes this
issue correct and please send it with a proper subject line.

Regards

Marcel

[PATCH v2] [Bluetooth] redo checks in IRQ handler for shared IRQ support

[Mike Frysinger]

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 explaining that we want this behavior.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
v2
	- tweak commit log to not use git-revert

 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

Re: [PATCH v2] [Bluetooth] redo checks in IRQ handler for shared IRQ support

[Mike Frysinger]

On Mon, Sep 14, 2009 at 12:43, Mike Frysinger wrote:
> Commit ac019360fe3 changed the irq handler logic to BUG_ON rather than
> returning IRQ_NONE when the incoming argument is invalid. =C2=A0While thi=
s
> 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 explaining that we want this behavior.

was this picked up ?
-mike

Re: [PATCH v2] [Bluetooth] redo checks in IRQ handler for shared IRQ support

[Marcel Holtmann]

Hi Mike,

> > 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 explaining that we want this behavior.
> 
> was this picked up ?

not it was not, but now it has been applied to my trees. Thanks.

Regards

Marcel