From nobody Fri Apr 3 08:34:57 2026 Received: from mail-dy1-f195.google.com (mail-dy1-f195.google.com [74.125.82.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D654536DA1A for ; Tue, 24 Mar 2026 15:30:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.195 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774366236; cv=none; b=Vy0Nl5ZtmOiSOwJdh25kNzJHGyT4JSRxaHh8hbopSy0DV5hfsENo7wGIdKPA8FiwFwiko4/N8Icx2XIYW5b0P61NZpmuAP2Rv92iGYQ3Q+lo2Bxzse/uYCKV7DMIiHQUzr0BqnH+p28H3rLA5cHitIi2yw/OdgOcpoTA2L6nyOA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774366236; c=relaxed/simple; bh=eBU630oFfSvL+Z7ajS9wK93mpaQK8s/AQJ3EawS9+Wg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Fx594vTKeRHPMwzsxN0G7gJN2JS0km2MC0kmCwPwT+K7Ep0yjIt2gbs6PMaBYw2FrpEWcjKUeI3F1M7MNrU6hYAtPYYSbKseixYz3BBL1gCzMKdpPhoH+sicmq4tZQ1YttXt/qTStMko+WLuU6kfp6Cv6aB6M9NMlqf2MFpFwd4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=UXzrcz3F; arc=none smtp.client-ip=74.125.82.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="UXzrcz3F" Received: by mail-dy1-f195.google.com with SMTP id 5a478bee46e88-2c0f754e756so1705111eec.1 for ; Tue, 24 Mar 2026 08:30:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774366233; x=1774971033; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=uCn/MqHA11tVXJNjwUhww9VSY0nIMQtmkoUGALB7eDo=; b=UXzrcz3FUh3FiLxKryacYOVz+oVftTxnOfu5kMOSIryHg1JE7oPEgm62AILlR58oSe K4cCHxieMdFlhIWTF++9tP6lThgQWFtLBEtyDnKx01SIDgsYZ0Ku/1GjMT1DDXXxn7Mi XDg3iou4t4n2GxCdXMQ61UlggzOqGCbiMDd/1mgWyGQaKVKnAWla6LQre89NXkHGKX5R 1TgdNJRzkzoTf+E7J6Wf3v84HB8Qh7JGxo+ACVNQQBpSZQ9Xhstl9WbIho0HolQsxFuD lDIbLEQlpd1wHyQmjfQULxpXMjmsS/5IMj0yhBVgAKRJzTySqLp1uVU6HpZi4X/447Dg jdcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774366233; x=1774971033; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=uCn/MqHA11tVXJNjwUhww9VSY0nIMQtmkoUGALB7eDo=; b=W88Jx4AZQM3us9U0nDdDz73TBov31cyKIvCyPNzHYOPk7SqwdQLARYHAH+snW1lb3D xfLEOt3x6hlxH+2zph61xlW3SOSMpMsElAsVUAZ3y8vvlQa1CTK8ZUMzFNSgQLv5ZV2a CCLV49r4bDMRlFnqOYDLqRFQRsEg5tHY6VdPS5A1IioimPm2kfb1ZkNUCEDBMfcbGYU0 vnWdhpnY/3t3/Twtzfh1fqmDivQIVMZI5x21sVvXpxcBPNvDaxKBAY0LsF3FDERG17uz mPG/FGaKIWU0HmfhcQtNdpi4w5p4skwKhirTYaPOOwSNNRAH5jfmBOstCTMDm/Wnjd1+ 1/Ug== X-Forwarded-Encrypted: i=1; AJvYcCUG5DuGibP/RQ3OstfkzVgGG8n14OgSEiMzBpU16bjX6wBY+LLygXEJfPKIRp/UJX2PW9NghdvppENzGTo=@vger.kernel.org X-Gm-Message-State: AOJu0Ywh9gemn9uxlr5zynLWUt9SyLEgB1GziZ6g+jWL4mZjcxqmQ005 S82PeFFGc+PDcpqduBEfFiORYlmp56+fST7yF3RSewOqV6tP9DoOMSyFcVhBFN5n++A= X-Gm-Gg: ATEYQzzZvAvgqlnuEGSAz/k8zXtFZRFddTbBB/Y34P7FEqqUSwaogBbGvMx6FClXlwy rlHiym2nVLDU1BcQy1b3UBqwkrYPeXc0dpSykcRLYtA6A/wCC/JG4uiTmc6ycUYKmVLU7B9BySz tIfBV66OpelYH5K4r3vmSwBpSI9sAA6AWsJwLC8kGh2EG+fn4DDifsfkEY7SZBFUdrxfgDkoe6U dxau0TrTybyaqi/yhtgA/W2JX6O8eZkMT9hjDAYzuarwpG+aaMw8sZs6vXHEfNAbeNtkMKEg3DI dXhFRXIDTSlrwjp16MaXXr8K0hBPFKlZ0Yc7YUltFo56xUk0kyXwU7idFxhfnETsgLIer+gNWCN 4D/3a5X56BmmRrcuZBXEs2bw0wiOwp12+V78wuqVLdgkZVOs/1wHXSrdHH+TKPh9FJTR1sO4Yg/ ZcBr8UZdNKl6/239LeWDR0yVrFmGlkzeayaqDfKRp/+dptPePMuv+k5y5YRYomkTUrcWJj2FjGm SWmI+jh X-Received: by 2002:a05:7300:bc8e:b0:2c0:ae1b:4573 with SMTP id 5a478bee46e88-2c1095a5baamr8160636eec.7.1774366232827; Tue, 24 Mar 2026 08:30:32 -0700 (PDT) Received: from localhost.localdomain ([38.244.25.197]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c10aefd778sm20842577eec.0.2026.03.24.08.30.30 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 24 Mar 2026 08:30:32 -0700 (PDT) From: Eric-Terminal To: asmadeus@codewreck.org, ericvh@kernel.org, lucho@ionkov.net Cc: stefano.stabellini@amd.com, v9fs@lists.linux.dev, linux-kernel@vger.kernel.org, Yufan Chen Subject: [PATCH v3 1/2] 9p/trans_xen: make cleanup idempotent after dataring alloc errors Date: Tue, 24 Mar 2026 23:30:22 +0800 Message-ID: <20260324153023.86853-2-ericterminal@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260324153023.86853-1-ericterminal@gmail.com> References: <20260324153023.86853-1-ericterminal@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3464; i=ericterminal@gmail.com; h=from:subject; bh=vDNsz/omUMmP3CEetrmU1J5yJISS/nuy98ia+ZC4Yh4=; b=owGbwMvMwCXWM/dCzeS3H+sZT6slMWQeWqup5XD67uNZ+3kEygTn/5jXPf/RBxHWc/9zl+u4y c5r2bfBrWMiC4MYF4OlmCLL3f/75uZ63ZpznftwLswcViaQIdIiDQxAwMLAl5uYV2qkY6Rnqm2o Z2ikY6BjzMDFKQBTXbyckeH+2XsLvjlGSr7pWGT1ZA33V+FQlkfz6s/cnMH7ucki1bGB4Z9awql U3Rg7wQ0b8v+qTf3gee+q8I9+M/beugd/Z/zMV+YGAA== X-Developer-Key: i=ericterminal@gmail.com; a=openpgp; fpr=DDFFBE9D6D4ADA9CD70BC36D8C9DD07C93EDF17F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Yufan Chen xen_9pfs_front_alloc_dataring() tears down resources on failure but leaves ring fields stale. If xen_9pfs_front_init() later jumps to the common error path, xen_9pfs_front_free() may touch the same resources again, causing duplicate/invalid gnttab_end_foreign_access() calls and potentially dereferencing a freed intf pointer. Initialize dataring sentinels before allocation, gate teardown on those sentinels, and clear ref/intf/data/irq immediately after each release. This keeps cleanup idempotent for partially initialized rings and prevents repeated teardown during init failure handling. Signed-off-by: Yufan Chen --- v3: - Split from mixed series into a dedicated 9p/trans_xen series. - No functional changes since v2. net/9p/trans_xen.c | 51 +++++++++++++++++++++++++++++++++------------- diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c index 47af5a10e..85b9ebfaa 100644 --- a/net/9p/trans_xen.c +++ b/net/9p/trans_xen.c @@ -283,25 +283,33 @@ static void xen_9pfs_front_free(struct xen_9pfs_front= _priv *priv) =20 cancel_work_sync(&ring->work); =20 - if (!priv->rings[i].intf) + if (!ring->intf) break; - if (priv->rings[i].irq > 0) - unbind_from_irqhandler(priv->rings[i].irq, ring); - if (priv->rings[i].data.in) { - for (j =3D 0; - j < (1 << priv->rings[i].intf->ring_order); + if (ring->irq >=3D 0) { + unbind_from_irqhandler(ring->irq, ring); + ring->irq =3D -1; + } + if (ring->data.in) { + for (j =3D 0; j < (1 << ring->intf->ring_order); j++) { grant_ref_t ref; =20 - ref =3D priv->rings[i].intf->ref[j]; + ref =3D ring->intf->ref[j]; gnttab_end_foreign_access(ref, NULL); + ring->intf->ref[j] =3D INVALID_GRANT_REF; } - free_pages_exact(priv->rings[i].data.in, - 1UL << (priv->rings[i].intf->ring_order + - XEN_PAGE_SHIFT)); + free_pages_exact(ring->data.in, + 1UL << (ring->intf->ring_order + + XEN_PAGE_SHIFT)); + ring->data.in =3D NULL; + ring->data.out =3D NULL; + } + if (ring->ref !=3D INVALID_GRANT_REF) { + gnttab_end_foreign_access(ring->ref, NULL); + ring->ref =3D INVALID_GRANT_REF; } - gnttab_end_foreign_access(priv->rings[i].ref, NULL); - free_page((unsigned long)priv->rings[i].intf); + free_page((unsigned long)ring->intf); + ring->intf =3D NULL; } kfree(priv->rings); } @@ -334,6 +342,12 @@ static int xen_9pfs_front_alloc_dataring(struct xenbus= _device *dev, int ret =3D -ENOMEM; void *bytes =3D NULL; =20 + ring->intf =3D NULL; + ring->data.in =3D NULL; + ring->data.out =3D NULL; + ring->ref =3D INVALID_GRANT_REF; + ring->irq =3D -1; + init_waitqueue_head(&ring->wq); spin_lock_init(&ring->lock); INIT_WORK(&ring->work, p9_xen_response); @@ -379,9 +393,18 @@ static int xen_9pfs_front_alloc_dataring(struct xenbus= _device *dev, for (i--; i >=3D 0; i--) gnttab_end_foreign_access(ring->intf->ref[i], NULL); free_pages_exact(bytes, 1UL << (order + XEN_PAGE_SHIFT)); + ring->data.in =3D NULL; + ring->data.out =3D NULL; + } + if (ring->ref !=3D INVALID_GRANT_REF) { + gnttab_end_foreign_access(ring->ref, NULL); + ring->ref =3D INVALID_GRANT_REF; + } + if (ring->intf) { + free_page((unsigned long)ring->intf); + ring->intf =3D NULL; } - gnttab_end_foreign_access(ring->ref, NULL); - free_page((unsigned long)ring->intf); + ring->irq =3D -1; return ret; } =20 --=20 2.47.3 From nobody Fri Apr 3 08:34:57 2026 Received: from mail-dy1-f193.google.com (mail-dy1-f193.google.com [74.125.82.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A6D4239022D for ; Tue, 24 Mar 2026 15:30:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774366238; cv=none; b=pSxBBYMrLW4tSTAGYmrtUFQRJtvIXDHC9S/V1fxl+lFoDS6BuWiL3SPp0tIDSFV5fP10QrO89feazs/fRYdteZUX82AWYoufkAW9+8hd6tVFK20+1S7HEgUVYN3INrdPexKu+oKsdhVb5NaIyO8GNUqxP+4rgCvoAnX6nOa5Uqc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774366238; c=relaxed/simple; bh=dLAX/MaLMsA55bQXtSczaYIpJZHd96/3ujOVO8C7BxA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lNlxgVUGQ0d5x2cZxk2HgtP+TlYBz/OaVYt02f/yQrEwIII21s3hx6YOOyFH650StzF5CArH/UYAH+DHiXCnT5HfQPc9D9qblUC0qfELRzj6bxziDVfCeQG6m3LysA7i66ZrVwAHCWC6++QXv21butCXE2oSbkrlQl8OZ4lJfTE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Z3qZE811; arc=none smtp.client-ip=74.125.82.193 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Z3qZE811" Received: by mail-dy1-f193.google.com with SMTP id 5a478bee46e88-2c10a2e2cd1so5444609eec.0 for ; Tue, 24 Mar 2026 08:30:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774366236; x=1774971036; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=k+MnIitRRQp1/N0eopQVQ2cUe8bKDReL4QPDo76ZT4M=; b=Z3qZE811M40FVN+4GZHqncabVPR1hmqLQfgIPGpQtcwQ0A5jeBek6KxU2L1XmNTzRT kmau+it6XNyzYUvMLijadG6K1NBomCoubTbll8ju+4LpZ+T3G+cKFadTNIUkwz4NV9Qe 2urEDmtp1Kd0l2JGu1ZIQOK+jLLuoIG8e7H9xiN0vFFm9Tvvp1xlFk8+TpHsSiG2RNiG M51DrY9oKX6qt1QDGroFmirsmyMSsXsQbPZ+CS/yQTWD1OR/bEhfj/67In42yOFM/QRE R3hjRY7+U3JTJ6DxyHDhKSzLXFAd/uvKjuHzoo8QBakfmI3TKFJpvVuwoXsWiOru9dm5 9R7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774366236; x=1774971036; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=k+MnIitRRQp1/N0eopQVQ2cUe8bKDReL4QPDo76ZT4M=; b=YUIgZbpKsrZtzgrkralPlOb1MiBDErtZiaKL2ag7OJ8+/41TW2aGG0rBtZyt5G4B8D qLsbmBJbJx6nnZVyp3qJBejGwEg37X2sNXNGd8v0tAHrHzLOO/FtP1dzMx28TX8KHUzA V/6bFw70Izf4fw/rYCspAFHAN1b0rI17Lal9o6CS4pwUHnX7+34kysMqOcRs4WZ5A47F 9dsct2w4CqWrYjBT9SwTMyP/Z3gbcDquHHB1AyUFnxJZQGiHve2VsfrRqO8/a8pEZbaC ht1mEiU11GsDh5a8EaB0FTX3FMSnv6CedIeNVwuk4LTFmuM/G7mBPXZHZbO8mkDTTysc Dtgw== X-Forwarded-Encrypted: i=1; AJvYcCX1dAKPrMaNfRRbstyEcqgtn0HjpZV1iMNNeTr+T/kwrhCDisbLYhzG6fRiHhmkaqB1aTHxZ5TaHG2sjYk=@vger.kernel.org X-Gm-Message-State: AOJu0YzPyXQ/8immrztSfei6TA4GCV5YS34G8OhZkLxcx5KOjpYckmQD awAFmVgtsodCxuvC2/UKFlI6DRLf5TwduTl+FVtPBqSSgRp0OWsOMcrhU+PvaLj+XMU= X-Gm-Gg: ATEYQzxhXK6B3KFW3+uhAaAipggWweTDOv63QR6V0OLQK4uXMZKskxyj4mq21aF2wU/ mB50UIQ1Aro3kYcMQgJa78+tswpQn2RWVMibPF2urv7g6aDZQX/RzDcW9raadcvyNTonE9lQ4wm GWStXvdQkXuNxQy+Yn0DEQf3HSgNL+4ttKjPCyU1kifuXEN3ZO0mcPNvrwZjI66T6NvYFT9D8h8 w2aDNQAyzL24968qSh2BNgexrJPzYz6Aj+7EzOs5VDcNyOGeH8WLhNDsjmnABmYVRUfhlQZfVhZ RKgpFM2jLelSvbml28KQ5QLDYyRde/4ZtfNFhczNT6hkiWnkQx0sno3mliy8eoy0L9TS2CFQLaF rUF4lJqCVWUcUZJLywB9qB1+4SGvpignruWdzMQD5hG0usMcuzPfCv+0/ESjG6FZv6td6cGLiTR GMM8iuNKmzh3rVq6frF+/l+W1OETwtpJ2RBnVNloOgFoH6iTWdaD8y4ex3LejGH4pFibXTMg== X-Received: by 2002:a05:7300:e2cc:b0:2bd:d04c:a430 with SMTP id 5a478bee46e88-2c1095fd85dmr9074373eec.12.1774366235748; Tue, 24 Mar 2026 08:30:35 -0700 (PDT) Received: from localhost.localdomain ([38.244.25.197]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c10aefd778sm20842577eec.0.2026.03.24.08.30.33 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 24 Mar 2026 08:30:35 -0700 (PDT) From: Eric-Terminal To: asmadeus@codewreck.org, ericvh@kernel.org, lucho@ionkov.net Cc: stefano.stabellini@amd.com, v9fs@lists.linux.dev, linux-kernel@vger.kernel.org, Yufan Chen Subject: [PATCH v3 2/2] 9p/trans_xen: replace simple_strto* with kstrtouint Date: Tue, 24 Mar 2026 23:30:23 +0800 Message-ID: <20260324153023.86853-3-ericterminal@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260324153023.86853-1-ericterminal@gmail.com> References: <20260324153023.86853-1-ericterminal@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1856; i=ericterminal@gmail.com; h=from:subject; bh=J10JPVWKsVQanKp923Zl9fUFEZ4SGvBX5W7Guc7pfaU=; b=owGbwMvMwCXWM/dCzeS3H+sZT6slMWQeWqslevn97QnFyuvcPn1zXGlx4gPn3kMy/Or7fxctP Z0Vvjz1YsdEFgYxLgZLMUWWu//3zc31ujXnOvfhXJg5rEwgQ6RFGhiAgIWBLzcxr9RIx0jPVNtQ z9BIx0DHmIGLUwCmuleMkWG6nuTemQtvls2KNlu8teHmHK1NpntUJ7YzV61g3WjG/esHI8OBU0+ Cpiiy/2YI0tP9fEI3+rawbHSSw0HL42brpnN8ecUGAA== X-Developer-Key: i=ericterminal@gmail.com; a=openpgp; fpr=DDFFBE9D6D4ADA9CD70BC36D8C9DD07C93EDF17F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Yufan Chen In xen_9pfs_front_init(), parse the backend version list as comma-separated tokens with kstrtouint(), keep strict token validation, and explicitly require protocol version 1 to be present. This replaces the deprecated simple_strtoul(), improves error reporting consistency, and avoids partially parsed values in control paths. Signed-off-by: Yufan Chen --- v3: - Split from mixed series into a dedicated 9p/trans_xen series. - Refined commit message to focus on 9p changes. - No functional changes since v2. net/9p/trans_xen.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c index 85b9ebfaa..f9fb2db7a 100644 --- a/net/9p/trans_xen.c +++ b/net/9p/trans_xen.c @@ -413,23 +413,29 @@ static int xen_9pfs_front_init(struct xenbus_device *= dev) int ret, i; struct xenbus_transaction xbt; struct xen_9pfs_front_priv *priv; - char *versions, *v; - unsigned int max_rings, max_ring_order, len =3D 0; + char *versions, *v, *token; + bool version_1 =3D false; + unsigned int max_rings, max_ring_order, len =3D 0, version; =20 versions =3D xenbus_read(XBT_NIL, dev->otherend, "versions", &len); if (IS_ERR(versions)) return PTR_ERR(versions); - for (v =3D versions; *v; v++) { - if (simple_strtoul(v, &v, 10) =3D=3D 1) { - v =3D NULL; - break; + for (v =3D versions; (token =3D strsep(&v, ",")); ) { + if (!*token) + continue; + + ret =3D kstrtouint(token, 10, &version); + if (ret) { + kfree(versions); + return ret; } - } - if (v) { - kfree(versions); - return -EINVAL; + if (version =3D=3D 1) + version_1 =3D true; } kfree(versions); + if (!version_1) + return -EINVAL; + max_rings =3D xenbus_read_unsigned(dev->otherend, "max-rings", 0); if (max_rings < XEN_9PFS_NUM_RINGS)