From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61ED93128D0; Fri, 21 Nov 2025 13:37:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763732227; cv=none; b=JJyycuqcJaYVRfseH3Y0S0nL1xtshwcV+8xwfq3gwLRuxtJBZBDrnHokr8KObxMhqcWy4SyvE+p+eI0MOLcWpT/hLIr3IvGMx6xMK49EkEYFbsX5HuoWcpTg1kMCF9GtfxHL5nZVRur2jNaOwcAUaghQmptkFkd0JJrS5LqDmQA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763732227; c=relaxed/simple; bh=pYI7ESP6Ecesso2WCMHEG71cq2KgTgMJYzsXuPobLGc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sDulkChKnm/x/HT6Ykqc7Mm7s/9RBMg5mklLRXmo1UUvbz/cptCEv9/O+XZ/i5h/sNDtV4wt2jcDSFOEqcMPPWav9OCBBjs8gp/v4wVEnSJ4vRwTrfC0alwYUphzuTnrC9TjVlhnpl3SbdAT5fwWNTjYJG/L4+Ck7tHBDZIVngA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Yo3dZnGy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Yo3dZnGy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4C68C4CEFB; Fri, 21 Nov 2025 13:37:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1763732227; bh=pYI7ESP6Ecesso2WCMHEG71cq2KgTgMJYzsXuPobLGc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Yo3dZnGyEkEgj7WWaPqt45u+5lSCBjgx1gYowiRVuwTBnnYhTzkJpxLPzRecghZyg 1wVZFBqyO7Kzl3vcp1uJfFV4DgpVSxrBsECo2VWZOkWQIT/lYFtuOoQLxbh6llW8Kz ntGEwrvfNdRMI+puGV1355anUH/7k4HsPJ34Lz0o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable@vger.kernnel.org, Niklas Schnelle , Matthew Rosato , Farhan Ali , Heiko Carstens , Sasha Levin Subject: [PATCH 6.6 047/529] s390/pci: Restore IRQ unconditionally for the zPCI device Date: Fri, 21 Nov 2025 14:05:46 +0100 Message-ID: <20251121130232.678265250@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251121130230.985163914@linuxfoundation.org> References: <20251121130230.985163914@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Farhan Ali [ Upstream commit b45873c3f09153d1ad9b3a7bf9e5c0b0387fd2ea ] Commit c1e18c17bda6 ("s390/pci: add zpci_set_irq()/zpci_clear_irq()"), introduced the zpci_set_irq() and zpci_clear_irq(), to be used while resetting a zPCI device. Commit da995d538d3a ("s390/pci: implement reset_slot for hotplug slot"), mentions zpci_clear_irq() being called in the path for zpci_hot_reset_device(). But that is not the case anymore and these functions are not called outside of this file. Instead zpci_hot_reset_device() relies on zpci_disable_device() also clearing the IRQs, but misses to reset the zdev->irqs_registered flag. However after a CLP disable/enable reset, the device's IRQ are unregistered, but the flag zdev->irq_registered does not get cleared. It creates an inconsistent state and so arch_restore_msi_irqs() doesn't correctly restore the device's IRQ. This becomes a problem when a PCI driver tries to restore the state of the device through pci_restore_state(). Restore IRQ unconditionally for the device and remove the irq_registered flag as its redundant. Fixes: c1e18c17bda6 ("s390/pci: add zpci_set_irq()/zpci_clear_irq()") Cc: stable@vger.kernnel.org Reviewed-by: Niklas Schnelle Reviewed-by: Matthew Rosato Signed-off-by: Farhan Ali Signed-off-by: Heiko Carstens [ adjusted bitfield context ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/s390/include/asm/pci.h | 1 - arch/s390/pci/pci_irq.c | 9 +-------- 2 files changed, 1 insertion(+), 9 deletions(-) --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -138,7 +138,6 @@ struct zpci_dev { u8 has_resources : 1; u8 is_physfn : 1; u8 util_str_avail : 1; - u8 irqs_registered : 1; u8 reserved : 2; unsigned int devfn; /* DEVFN part of the RID*/ --- a/arch/s390/pci/pci_irq.c +++ b/arch/s390/pci/pci_irq.c @@ -107,9 +107,6 @@ static int zpci_set_irq(struct zpci_dev else rc = zpci_set_airq(zdev); - if (!rc) - zdev->irqs_registered = 1; - return rc; } @@ -123,9 +120,6 @@ static int zpci_clear_irq(struct zpci_de else rc = zpci_clear_airq(zdev); - if (!rc) - zdev->irqs_registered = 0; - return rc; } @@ -427,8 +421,7 @@ bool arch_restore_msi_irqs(struct pci_de { struct zpci_dev *zdev = to_zpci(pdev); - if (!zdev->irqs_registered) - zpci_set_irq(zdev); + zpci_set_irq(zdev); return true; }