linux-kernel - [PATCH 3/9] spmi: pmic-arb: handle spurious interrupt

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220930005019.2663064-4-sboyd@kernel.org>
Date:   Thu, 29 Sep 2022 17:50:12 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Fenglin Wu <quic_fenglinw@...cinc.com>,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: [PATCH 3/9] spmi: pmic-arb: handle spurious interrupt

From: Fenglin Wu <quic_fenglinw@...cinc.com>

Call handle_bad_irq() when the summary interrupt is fired spuriously.

Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
Link: https://lore.kernel.org/r/1655004286-11493-3-git-send-email-quic_fenglinw@quicinc.com
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
---
 drivers/spmi/spmi-pmic-arb.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 5a99723b3f32..719bd73e5153 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -605,10 +605,11 @@ static void cleanup_irq(struct spmi_pmic_arb *pmic_arb, u16 apid, int id)
 				irq_mask, ppid);
 }
 
-static void periph_interrupt(struct spmi_pmic_arb *pmic_arb, u16 apid)
+static int periph_interrupt(struct spmi_pmic_arb *pmic_arb, u16 apid)
 {
 	unsigned int irq;
 	u32 status, id;
+	int handled = 0;
 	u8 sid = (pmic_arb->apid_data[apid].ppid >> 8) & 0xF;
 	u8 per = pmic_arb->apid_data[apid].ppid & 0xFF;
 
@@ -623,7 +624,10 @@ static void periph_interrupt(struct spmi_pmic_arb *pmic_arb, u16 apid)
 			continue;
 		}
 		generic_handle_irq(irq);
+		handled++;
 	}
+
+	return handled;
 }
 
 static void pmic_arb_chained_irq(struct irq_desc *desc)
@@ -634,7 +638,7 @@ static void pmic_arb_chained_irq(struct irq_desc *desc)
 	int first = pmic_arb->min_apid >> 5;
 	int last = pmic_arb->max_apid >> 5;
 	u8 ee = pmic_arb->ee;
-	u32 status, enable;
+	u32 status, enable, handled = 0;
 	int i, id, apid;
 
 	chained_irq_enter(chip, desc);
@@ -649,10 +653,14 @@ static void pmic_arb_chained_irq(struct irq_desc *desc)
 			enable = readl_relaxed(
 					ver_ops->acc_enable(pmic_arb, apid));
 			if (enable & SPMI_PIC_ACC_ENABLE_BIT)
-				periph_interrupt(pmic_arb, apid);
+				if (periph_interrupt(pmic_arb, apid) != 0)
+					handled++;
 		}
 	}
 
+	if (handled == 0)
+		handle_bad_irq(desc);
+
 	chained_irq_exit(chip, desc);
 }
 
-- 
https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/
https://git.kernel.org/pub/scm/linux/kernel/git/sboyd/spmi.git