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From: Fenglin Wu <quic_fenglinw@quicinc.com>
To: <linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<sboyd@kernel.org>
Cc: <collinsd@codeaurora.org>, <subbaram@codeaurora.org>,
	<quic_fenglinw@quicinc.com>
Subject: [RESEND PATCH v1 3/9] spmi: pmic-arb: check apid against limits before calling irq handler
Date: Fri, 17 Sep 2021 14:32:58 +0800	[thread overview]
Message-ID: <1631860384-26608-4-git-send-email-quic_fenglinw@quicinc.com> (raw)
In-Reply-To: <1631860384-26608-1-git-send-email-quic_fenglinw@quicinc.com>

From: David Collins <collinsd@codeaurora.org>

Check that the apid for an SPMI interrupt falls between the
min_apid and max_apid that can be handled by the APPS processor
before invoking the per-apid interrupt handler:
periph_interrupt().

This avoids an access violation in rare cases where the status
bit is set for an interrupt that is not owned by the APPS
processor.

Signed-off-by: David Collins <collinsd@codeaurora.org>
Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
---
 drivers/spmi/spmi-pmic-arb.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 4d7ad004..c4adc06 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -535,6 +535,12 @@ static void pmic_arb_chained_irq(struct irq_desc *desc)
 			id = ffs(status) - 1;
 			status &= ~BIT(id);
 			apid = id + i * 32;
+			if (apid < pmic_arb->min_apid
+			    || apid > pmic_arb->max_apid) {
+				WARN_ONCE(true, "spurious spmi irq received for apid=%d\n",
+					apid);
+				continue;
+			}
 			enable = readl_relaxed(
 					ver_ops->acc_enable(pmic_arb, apid));
 			if (enable & SPMI_PIC_ACC_ENABLE_BIT)
-- 
2.7.4


  parent reply	other threads:[~2021-09-17  6:33 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17  6:32 [RESEND PATCH v1 0/9] A bunch of fix and optimization patches in spmi-pmic-arb.c Fenglin Wu
2021-09-17  6:32 ` [RESEND PATCH v1 1/9] spmi: pmic-arb: add a print in cleanup_irq Fenglin Wu
2021-10-12 17:46   ` Stephen Boyd
2021-10-13  4:15     ` Fenglin Wu
2021-10-13 19:35       ` Stephen Boyd
2021-10-14  2:26         ` Fenglin Wu
2021-10-15  1:09           ` Stephen Boyd
2021-10-15  1:27             ` Fenglin Wu
2021-10-18  0:16               ` Fenglin Wu
2021-09-17  6:32 ` [RESEND PATCH v1 2/9] spmi: pmic-arb: do not ack and clear peripheral interrupts " Fenglin Wu
2021-09-17  6:32 ` Fenglin Wu [this message]
2021-10-12 18:02   ` [RESEND PATCH v1 3/9] spmi: pmic-arb: check apid against limits before calling irq handler Stephen Boyd
2021-10-13  5:31     ` Fenglin Wu
2021-10-13 19:25       ` Stephen Boyd
2021-10-14  3:11         ` Fenglin Wu
2021-10-15  1:15           ` Stephen Boyd
2021-10-15  1:54             ` Fenglin Wu
2021-09-17  6:32 ` [RESEND PATCH v1 4/9] spmi: pmic-arb: add support to dispatch interrupt based on IRQ status Fenglin Wu
2021-09-17  6:33 ` [RESEND PATCH v1 5/9] spmi: pmic-arb: correct duplicate APID to PPID mapping logic Fenglin Wu
2021-10-12 17:44   ` Stephen Boyd
2021-10-13  5:37     ` Fenglin Wu
2021-09-17  6:33 ` [RESEND PATCH v1 6/9] spmi: pmic-arb: block access for invalid PMIC arbiter v5 SPMI writes Fenglin Wu
2021-09-17  6:33 ` [RESEND PATCH v1 7/9] spmi: pmic-arb: support updating interrupt type flags Fenglin Wu
2021-10-12 17:42   ` Stephen Boyd
2021-10-13  6:27     ` Fenglin Wu
2021-10-13 19:37       ` Stephen Boyd
2021-10-14  3:17         ` Fenglin Wu
2021-09-17  6:33 ` [RESEND PATCH v1 8/9] spmi: pmic-arb: make interrupt support optional Fenglin Wu
2021-10-12 17:41   ` Stephen Boyd
2021-10-13  8:36     ` Fenglin Wu
2021-10-13 19:38       ` Stephen Boyd
2021-10-14  3:20         ` Fenglin Wu
2021-10-15  1:17           ` Stephen Boyd
2021-10-15  1:30             ` Fenglin Wu
2021-09-17  6:33 ` [RESEND PATCH v1 9/9] spmi: pmic-arb: increase SPMI transaction timeout delay Fenglin Wu
  -- strict thread matches above, loose matches on Subject: below --
2021-09-01  8:18 [RESEND PATCH v1 0/9] A bunch of fix and optimization patches in spmi-pmic-arb.c Fenglin Wu
2021-09-01  8:18 ` [RESEND PATCH v1 3/9] spmi: pmic-arb: check apid against limits before calling irq handler Fenglin Wu

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