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-next>] [day] [month] [year] [list]
Date: Wed, 20 Mar 2024 18:32:10 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Vinod Koul <vkoul@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Heiner Kallweit <hkallweit1@...il.com>
Subject: [PATCH v1 1/1] idma64: Don't try to serve interrupts when device is powered off

When iDMA 64-bit device is powered off, the IRQ status register
is all 1:s. This is never happen in real case and signalling that
the device is simply powered off. Don't try to serve interrupts
that are not ours.

Fixes: 667dfed98615 ("dmaengine: add a driver for Intel integrated DMA 64-bit")
Reported-by: Heiner Kallweit <hkallweit1@...il.com>
Closes: https://lore.kernel.org/r/700bbb84-90e1-4505-8ff0-3f17ea8bc631@gmail.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/dma/idma64.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/idma64.c b/drivers/dma/idma64.c
index 78a938969d7d..1b60e73d9322 100644
--- a/drivers/dma/idma64.c
+++ b/drivers/dma/idma64.c
@@ -173,6 +173,10 @@ static irqreturn_t idma64_irq(int irq, void *dev)
 
 	dev_vdbg(idma64->dma.dev, "%s: status=%#x\n", __func__, status);
 
+	/* Since IRQ may be shared, check if DMA controller is powered on */
+	if (status == GENMASK(31, 0))
+		return IRQ_NONE;
+
 	/* Check if we have any interrupt from the DMA controller */
 	if (!status)
 		return IRQ_NONE;
-- 
2.43.0.rc1.1.gbec44491f096


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ