arm: mach-davinci: check irq2ctlr() result

If irq2ctlr() fails return IRQ_NONE.
Also as it can fail make 'ctlr' signed.

The semantic patch that finds this problem (many false-positive results):
(http://coccinelle.lip6.fr/)

// <smpl>
@ r1 @
identifier f;
@@
int f(...) { ... }

@@
identifier r1.f;
type T;
unsigned T x;
@@

*x = f(...)
 ...
*x > 0

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

diff --git a/arch/arm/mach-davinci/dma.c b/arch/arm/mach-davinci/dma.c
index 2ede598..6b96698 100644 (file)
--- a/arch/arm/mach-davinci/dma.c
+++ b/arch/arm/mach-davinci/dma.c
@@ -354,10 +354,12 @@ static int irq2ctlr(int irq)
 static irqreturn_t dma_irq_handler(int irq, void *data)
 {
        int i;
-       unsigned ctlr;
+       int ctlr;
        unsigned int cnt = 0;
 
        ctlr = irq2ctlr(irq);
+       if (ctlr < 0)
+               return IRQ_NONE;
 
        dev_dbg(data, "dma_irq_handler\n");
 
@@ -408,10 +410,12 @@ static irqreturn_t dma_irq_handler(int irq, void *data)
 static irqreturn_t dma_ccerr_handler(int irq, void *data)
 {
        int i;
-       unsigned ctlr;
+       int ctlr;
        unsigned int cnt = 0;
 
        ctlr = irq2ctlr(irq);
+       if (ctlr < 0)
+               return IRQ_NONE;
 
        dev_dbg(data, "dma_ccerr_handler\n");