From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Marc Zyngier <maz@kernel.org>,
Linus Walleij <linus.walleij@linaro.org>,
Sasha Levin <sashal@kernel.org>,
linux-gpio@vger.kernel.org
Subject: [PATCH AUTOSEL 5.8 23/24] gpio: pca953x: Survive spurious interrupts
Date: Mon, 12 Oct 2020 15:02:38 -0400 [thread overview]
Message-ID: <20201012190239.3279198-23-sashal@kernel.org> (raw)
In-Reply-To: <20201012190239.3279198-1-sashal@kernel.org>
From: Marc Zyngier <maz@kernel.org>
[ Upstream commit 8b81edd80baf12d64420daff1759380aa9a14998 ]
The pca953x driver never checks the result of irq_find_mapping(),
which returns 0 when no mapping is found. When a spurious interrupt
is delivered (which can happen under obscure circumstances), the
kernel explodes as it still tries to handle the error code as
a real interrupt.
Handle this particular case and warn on spurious interrupts.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201005140217.1390851-1-maz@kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpio/gpio-pca953x.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 11c3bbd105f11..1de182b85e4c4 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -821,8 +821,21 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
ret = pca953x_irq_pending(chip, pending);
mutex_unlock(&chip->i2c_lock);
- for_each_set_bit(level, pending, gc->ngpio)
- handle_nested_irq(irq_find_mapping(gc->irq.domain, level));
+ if (ret) {
+ ret = 0;
+
+ for_each_set_bit(level, pending, gc->ngpio) {
+ int nested_irq = irq_find_mapping(gc->irq.domain, level);
+
+ if (unlikely(nested_irq <= 0)) {
+ dev_warn_ratelimited(gc->parent, "unmapped interrupt %d\n", level);
+ continue;
+ }
+
+ handle_nested_irq(nested_irq);
+ ret = 1;
+ }
+ }
return IRQ_RETVAL(ret);
}
--
2.25.1
next prev parent reply other threads:[~2020-10-12 19:03 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 19:02 [PATCH AUTOSEL 5.8 01/24] net: lantiq: Add locking for TX DMA channel Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 02/24] platform/x86: touchscreen_dmi: Add info for the MPMAN Converter9 2-in-1 Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 03/24] platform/x86: asus-nb-wmi: Revert "Do not load on Asus T100TA and T200TA" Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 04/24] platform/x86: asus-wmi: Add BATC battery name to the list of supported Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 05/24] platform/x86: mlx-platform: Fix extended topology configuration for power supply units Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 06/24] mt76: mt7615: reduce maximum VHT MPDU length to 7991 Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 07/24] drivers/net/wan/x25_asy: Correct the ndo_open and ndo_stop functions Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 08/24] net: mscc: ocelot: fix fields offset in SG_CONFIG_REG_3 Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 09/24] net/fsl: quieten expected MDIO access failures Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 10/24] net: usb: ax88179_178a: add Toshiba usb 3.0 adapter Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 11/24] net: atlantic: fix build when object tree is separate Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 12/24] net: usb: ax88179_178a: add MCT usb 3.0 adapter Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 13/24] net: dsa: felix: fix incorrect action offsets for VCAP IS2 Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 14/24] via-rhine: Fix for the hardware having a reset failure after resume Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 15/24] via-rhine: VTunknown1 device is really VT8251 South Bridge Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 16/24] vhost vdpa: fix vhost_vdpa_open error handling Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 17/24] net: usb: pegasus: Proper error handing when setting pegasus' MAC address Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 18/24] net: usb: rtl8150: set random MAC address when set_ethernet_addr() fails Sasha Levin
2020-10-12 19:11 ` Joe Perches
2020-10-12 21:01 ` Petko Manolov
2020-10-14 14:04 ` Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 19/24] usermodehelper: reset umask to default before executing user process Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 20/24] riscv: Fixup bootup failure with HARDENED_USERCOPY Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 21/24] arm/arm64: xen: Fix to convert percpu address to gfn correctly Sasha Levin
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 22/24] exfat: fix pointer error checking Sasha Levin
2020-10-12 19:02 ` Sasha Levin [this message]
2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 24/24] net: usb: qmi_wwan: add Cellient MPL200 card Sasha Levin
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