From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Robin Murphy <robin.murphy@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>
Subject: [PATCH][next] perf: arm-cmn: Fix unsigned comparison to less than zero
Date: Tue, 29 Sep 2020 12:08:35 -0500 [thread overview]
Message-ID: <20200929170835.GA15956@embeddedor> (raw)
Fix unsigned comparison to less than zero by assigning the returned
value of function platform_get_irq() to a new integer variable _ret_
and then make the comparison. In case the returned value is greater
than or equal to zero, assign it to dtc->irq.
Addresses-Coverity-ID: 1497488 ("Unsigned compared against 0")
Fixes: 0ba64770a2f2 ("perf: Add Arm CMN-600 PMU driver")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
drivers/perf/arm-cmn.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index e824b5b83ea2..383b67042677 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -1246,11 +1246,13 @@ static int arm_cmn_init_dtc(struct arm_cmn *cmn, struct arm_cmn_node *dn, int id
{
struct arm_cmn_dtc *dtc = cmn->dtc + idx;
struct arm_cmn_node *xp;
+ int ret;
dtc->base = dn->pmu_base - CMN_PMU_OFFSET;
- dtc->irq = platform_get_irq(to_platform_device(cmn->dev), idx);
- if (dtc->irq < 0)
- return dtc->irq;
+ ret = platform_get_irq(to_platform_device(cmn->dev), idx);
+ if (ret < 0)
+ return ret;
+ dtc->irq = ret;
writel_relaxed(0, dtc->base + CMN_DT_PMCR);
writel_relaxed(0x1ff, dtc->base + CMN_DT_PMOVSR_CLR);
--
2.27.0
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next reply other threads:[~2020-09-29 17:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 17:08 Gustavo A. R. Silva [this message]
2020-09-29 17:17 ` [PATCH][next] perf: arm-cmn: Fix unsigned comparison to less than zero Will Deacon
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