[PATCH AUTOSEL 4.19 561/671] net: aquantia: Fix aq_vec_isr_legacy() return value

Sasha Levin
2020-01-16T18:40:15Z

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit 31aefe14bc9f56566041303d733fda511d3a1c3e ]

The irqreturn_t type is an enum or an unsigned int in GCC. That
creates to problems because it can't detect if the
self->aq_hw_ops->hw_irq_read() call fails and at the end the function
always returns IRQ_HANDLED.

drivers/net/ethernet/aquantia/atlantic/aq_vec.c:316 aq_vec_isr_legacy() warn: unsigned 'err' is never less than zero.
drivers/net/ethernet/aquantia/atlantic/aq_vec.c:329 aq_vec_isr_legacy() warn: always true condition '(err >= 0) => (0-u32max >= 0)'

Fixes: 970a2e9864b0 ("net: ethernet: aquantia: Vector operations")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/aquantia/atlantic/aq_vec.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_vec.c b/drivers/net/ethernet/aquantia/atlantic/aq_vec.c
index 82582fa54d5d..72aa2a4c4d66 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_vec.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_vec.c
@@ -309,15 +309,13 @@ irqreturn_t aq_vec_isr_legacy(int irq, void *private)
{
struct aq_vec_s *self = private;
u64 irq_mask = 0U;
- irqreturn_t err = 0;
+ int err;

- if (!self) {
- err = -EINVAL;
- goto err_exit;
- }
+ if (!self)
+ return IRQ_NONE;
err = self->aq_hw_ops->hw_irq_read(self->aq_hw, &irq_mask);
if (err < 0)
- goto err_exit;
+ return IRQ_NONE;

if (irq_mask) {
self->aq_hw_ops->hw_irq_disable(self->aq_hw,
@@ -325,11 +323,10 @@ irqreturn_t aq_vec_isr_legacy(int irq, void *private)
napi_schedule(&self->napi);
} else {
self->aq_hw_ops->hw_irq_enable(self->aq_hw, 1U);
- err = IRQ_NONE;
+ return IRQ_NONE;
}

-err_exit:
- return err >= 0 ? IRQ_HANDLED : IRQ_NONE;
+ return IRQ_HANDLED;
}

cpumask_t *aq_vec_get_affinity_mask(struct aq_vec_s *self)
--
2.20.1