From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 4526B4582DA; Tue, 21 Jul 2026 21:57:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671063; cv=none; b=fizmhiCHcANyj7st64eHF+cnFo8MAGLSUHkdVQq9uEHRo3PX/vAd7hh5GpISiwnrca5gbi8MHoOa85K31pHL+7iAkoktpdjiAUtBaTZWsyT2EpnQKWL6jcquJxAjXIzJ8mHXIJXOeDoP2SL7r8+LknLDYZktlq49aYCa/j4fSVw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671063; c=relaxed/simple; bh=lt+znx9obuurFXM8BSfxdeHEwhC9T15GOGyeMwCLS3w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Rrc2NkQ+IwcIZdml0bxsVYfDvvSlbqKTKGTZsSDmUU96Qel/oQ7JMQLZBQdbtEtHioQF50WteuKfsGzgRxjLRvPS4+LnmHoDnYvvG1UhHgd0jOApIqwvjObZdnkg4/Imv6uBFLOJPSpkPITrO9vLSmZzJb1+KzxE80XZDznkYXs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rm0QVL+z; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="rm0QVL+z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A14BA1F000E9; Tue, 21 Jul 2026 21:57:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671061; bh=r8t1XtWpqeEV6IVHq8S+W4U2k64RQPAK4MuMIJ7u9j0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rm0QVL+z87UFB1cjwz2YdeiE6GuRK/dVTyuc9dr1wR38K6EvMPtTIlXEg3FxO03vk TJlYn+Ns2afQcbylMbw3gE6OUCxWfPIYXaaz4XrJvm9B6X9M4VvqQ4rcrixKNAXXGB 7i7VbNrl/U4DvdlLWBAuEg3UBMPqH5p8LTfq5IQ8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Koichiro Den , Manivannan Sadhasivam , Bjorn Helgaas , Dave Jiang Subject: [PATCH 5.15 104/843] NTB: epf: Avoid calling pci_irq_vector() from hardirq context Date: Tue, 21 Jul 2026 17:15:39 +0200 Message-ID: <20260721152408.341061260@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Koichiro Den commit 4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f upstream. ntb_epf_vec_isr() calls pci_irq_vector() in hardirq context to derive the vector number. pci_irq_vector() calls msi_get_virq() that takes a mutex and can therefore trigger "scheduling while atomic" splats: BUG: scheduling while atomic: kworker/u33:0/55/0x00010001 ... Call trace: ... schedule+0x38/0x110 schedule_preempt_disabled+0x28/0x50 __mutex_lock.constprop.0+0x848/0x908 __mutex_lock_slowpath+0x18/0x30 mutex_lock+0x4c/0x60 msi_domain_get_virq+0xe8/0x138 pci_irq_vector+0x2c/0x60 ntb_epf_vec_isr+0x28/0x120 [ntb_hw_epf] __handle_irq_event_percpu+0x70/0x3a8 handle_irq_event+0x48/0x100 handle_edge_irq+0x100/0x1c8 ... Cache the Linux IRQ number for vector 0 when vectors are allocated and use it as a base in the ISR. Running the ISR in a threaded IRQ handler would also avoid the problem, but that would be unnecessary here. Fixes: 812ce2f8d14e ("NTB: Add support for EPF PCI Non-Transparent Bridge") Signed-off-by: Koichiro Den Signed-off-by: Manivannan Sadhasivam Signed-off-by: Bjorn Helgaas Reviewed-by: Dave Jiang Cc: stable@vger.kernel.org # v5.12+ Link: https://patch.msgid.link/20260304083028.1391068-3-den@valinux.co.jp Signed-off-by: Greg Kroah-Hartman --- drivers/ntb/hw/epf/ntb_hw_epf.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/ntb/hw/epf/ntb_hw_epf.c +++ b/drivers/ntb/hw/epf/ntb_hw_epf.c @@ -81,6 +81,7 @@ struct ntb_epf_dev { int db_val; u64 db_valid_mask; + int irq_base; }; #define ntb_ndev(__ntb) container_of(__ntb, struct ntb_epf_dev, ntb) @@ -316,7 +317,7 @@ static irqreturn_t ntb_epf_vec_isr(int i struct ntb_epf_dev *ndev = dev; int irq_no; - irq_no = irq - pci_irq_vector(ndev->ntb.pdev, 0); + irq_no = irq - ndev->irq_base; ndev->db_val = irq_no + 1; if (irq_no == 0) @@ -348,6 +349,7 @@ static int ntb_epf_init_isr(struct ntb_e argument &= ~MSIX_ENABLE; } + ndev->irq_base = pci_irq_vector(pdev, 0); for (i = 0; i < irq; i++) { ret = request_irq(pci_irq_vector(pdev, i), ntb_epf_vec_isr, 0, "ntb_epf", ndev);