gpio: mpc8xxx: Prevent NULL pointer deref in demux handler
authorThomas Gleixner <tglx@linutronix.de>
Thu, 3 May 2012 10:22:06 +0000 (12:22 +0200)
committerGrant Likely <grant.likely@secretlab.ca>
Fri, 18 May 2012 22:48:36 +0000 (16:48 -0600)
commit cfadd838(powerpc/8xxx: Fix interrupt handling in MPC8xxx GPIO
driver) added an unconditional call of chip->irq_eoi() to the demux
handler.

This leads to a NULL pointer derefernce on MPC512x platforms which use
this driver as well.

Make it conditional.

Reported-by: Thomas Wucher <thwucher@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Felix Radensky <felix@embedded-sol.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: stable@vger.kernel.org
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
drivers/gpio/gpio-mpc8xxx.c

index e6568c19c939e1691a2a878e26292f1c877cae9b..5a1817eedd1ba42a661bde558d212d748b9752a3 100644 (file)
@@ -163,7 +163,8 @@ static void mpc8xxx_gpio_irq_cascade(unsigned int irq, struct irq_desc *desc)
        if (mask)
                generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
                                                     32 - ffs(mask)));
-       chip->irq_eoi(&desc->irq_data);
+       if (chip->irq_eoi)
+               chip->irq_eoi(&desc->irq_data);
 }
 
 static void mpc8xxx_irq_unmask(struct irq_data *d)