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 9C7D847127A; Tue, 21 Jul 2026 18:51:56 +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=1784659917; cv=none; b=t/7F5zjaWRORoJmLcf7B/WVymvlQVRKMWifA7xd0nnuMklyhkGNqIRzfqTLTOn4i0US+H2qm7Xr0stxnDRF1LHd9jYR9Lt1ra+bcT+p6Fg2RhjEG9Swm4vYm6iPel4rxdpuKNEbnSMcxts2biahdlPgmVxLL5vEeLR57ZK+WCJQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784659917; c=relaxed/simple; bh=OzpunsyFjzkjz7JKRvbCBvzbGocVJ8ZKii+Xgy+hg6U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ava3QFZsrZHbcm5rfGbRS2GLxf66XVhoiYQLm5hfYOksaq8BerS1uRpKJyV0GwvXCrC8EqolFqZV4yNwSHfyloiosvOAOQDQ5z+B7KtS7EXFlz2oowpDltEhdBL37BXhMc/SBsw9K4WAIdkC3yEwQ1MKG/J1dkCeJz2aynAyKsM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mA24MY54; 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="mA24MY54" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08BAF1F000E9; Tue, 21 Jul 2026 18:51:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784659916; bh=I7F9y5w0MHyixIViagDTkj/U/CMflx+kfxnpkQxCdBw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mA24MY541medCEWaR4ODPOK44MtCjRmywrKFUOtdP5+EFxslGqEuhKD8beTiNO0x0 7wARskeXDEc4NzT0WXUzLfYhZpkGxtmY61G9raDYXFwUJvat6FesZ9nf3N/kBLSUqc 1dkxGz85bcje9YIuPwjj7JrEX3HnvvpQlvqDLJIc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Williams , Alejandro Lucero , Dave Jiang , Sasha Levin Subject: [PATCH 7.1 0738/2077] cxl/memdev: Pin parents for entire memdev lifetime Date: Tue, 21 Jul 2026 17:06:51 +0200 Message-ID: <20260721152610.203305086@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152552.646164743@linuxfoundation.org> References: <20260721152552.646164743@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 7.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dan Williams [ Upstream commit bd3a6ff4b84e0fc3fca8556d338270603df13f2e ] In order to be able to manage the driver that uses a memdev attach mechanism the parent needs to stick around for the device_release_driver(cxlmd->dev.parent) event. Fixes: 29317f8dc6ed ("cxl/mem: Introduce cxl_memdev_attach for CXL-dependent operation") Signed-off-by: Dan Williams Reviewed-by: Alejandro Lucero Tested-by: ALejandro Lucero Reviewed-by: Dave Jiang Link: https://patch.msgid.link/20260519210158.1499795-4-djbw@kernel.org Signed-off-by: Dave Jiang Signed-off-by: Sasha Levin --- drivers/cxl/core/memdev.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index 80e65690eb773e..91c99eeea92ce4 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -25,9 +25,11 @@ static DEFINE_IDA(cxl_memdev_ida); static void cxl_memdev_release(struct device *dev) { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct device *parent = dev->parent; ida_free(&cxl_memdev_ida, cxlmd->id); kfree(cxlmd); + put_device(parent); } static char *cxl_memdev_devnode(const struct device *dev, umode_t *mode, kuid_t *uid, @@ -707,7 +709,7 @@ static struct cxl_memdev *cxl_memdev_alloc(struct cxl_dev_state *cxlds, dev = &cxlmd->dev; device_initialize(dev); lockdep_set_class(&dev->mutex, &cxl_memdev_key); - dev->parent = cxlds->dev; + dev->parent = get_device(cxlds->dev); dev->bus = &cxl_bus_type; dev->devt = MKDEV(cxl_mem_major, cxlmd->id); dev->type = &cxl_memdev_type; -- 2.53.0