MIPS: SGI-IP27: Fix use of unchecked pointer in shutdown_bridge_irq

smatch complaint:

    arch/mips/sgi-ip27/ip27-irq.c:123 shutdown_bridge_irq()
    warn: variable dereferenced before check 'hd' (see line 121)

Fix it by removing local variable and use hd->pin directly.

Fixes: 69a07a41d908 ("MIPS: SGI-IP27: rework HUB interrupts")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

diff --git a/arch/mips/sgi-ip27/ip27-irq.c b/arch/mips/sgi-ip27/ip27-irq.c
index 710a597..a32f843 100644 (file)
--- a/arch/mips/sgi-ip27/ip27-irq.c
+++ b/arch/mips/sgi-ip27/ip27-irq.c
@@ -118,7 +118,6 @@ static void shutdown_bridge_irq(struct irq_data *d)
 {
        struct hub_irq_data *hd = irq_data_get_irq_chip_data(d);
        struct bridge_controller *bc;
-       int pin = hd->pin;
 
        if (!hd)
                return;
@@ -126,7 +125,7 @@ static void shutdown_bridge_irq(struct irq_data *d)
        disable_hub_irq(d);
 
        bc = hd->bc;
-       bridge_clr(bc, b_int_enable, (1 << pin));
+       bridge_clr(bc, b_int_enable, (1 << hd->pin));
        bridge_read(bc, b_wid_tflush);
 }