From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 937B6C46467 for ; Mon, 16 Jan 2023 17:12:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234330AbjAPRMJ (ORCPT ); Mon, 16 Jan 2023 12:12:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234153AbjAPRLg (ORCPT ); Mon, 16 Jan 2023 12:11:36 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7AD9B46717 for ; Mon, 16 Jan 2023 08:51:49 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id EEDDD61050 for ; Mon, 16 Jan 2023 16:51:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07C41C433D2; Mon, 16 Jan 2023 16:51:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673887908; bh=0GMCo5dgqnLZz/xLU33OcMf9PF1DcJX2vENH8Awur4g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VZtwY+3/HB7YsHiE/jvWRjlNxu5b0oUmTtffmS7ILwS8GDH7N14OOYnr1GGbZ92rL yyvDbJIMWr99iFQGMLzlhCU3ike5CN/jyGEY8Tpmyb3GGPemL1LMjCkkEHFgSYaSb+ KVFvvGg/SHJoDzboO4Uq7XgPkrGE8MCY9Rg8caTQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yang Yingliang , Alexander Duyck , Jakub Kicinski , Sasha Levin Subject: [PATCH 4.19 298/521] mISDN: hfcsusb: dont call dev_kfree_skb/kfree_skb() under spin_lock_irqsave() Date: Mon, 16 Jan 2023 16:49:20 +0100 Message-Id: <20230116154900.444259088@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154847.246743274@linuxfoundation.org> References: <20230116154847.246743274@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Yang Yingliang [ Upstream commit ddc9648db162eee556edd5222d2808fe33730203 ] It is not allowed to call kfree_skb() or consume_skb() from hardware interrupt context or with hardware interrupts being disabled. It should use dev_kfree_skb_irq() or dev_consume_skb_irq() instead. The difference between them is free reason, dev_kfree_skb_irq() means the SKB is dropped in error and dev_consume_skb_irq() means the SKB is consumed in normal. skb_queue_purge() is called under spin_lock_irqsave() in hfcusb_l2l1D(), kfree_skb() is called in it, to fix this, use skb_queue_splice_init() to move the dch->squeue to a free queue, also enqueue the tx_skb and rx_skb, at last calling __skb_queue_purge() to free the SKBs afer unlock. In tx_iso_complete(), dev_kfree_skb() is called to consume the transmitted SKB, so replace it with dev_consume_skb_irq(). Fixes: 69f52adb2d53 ("mISDN: Add HFC USB driver") Signed-off-by: Yang Yingliang Reviewed-by: Alexander Duyck Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/isdn/hardware/mISDN/hfcsusb.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c index c952002c6301..c49081ed5734 100644 --- a/drivers/isdn/hardware/mISDN/hfcsusb.c +++ b/drivers/isdn/hardware/mISDN/hfcsusb.c @@ -337,20 +337,24 @@ hfcusb_l2l1D(struct mISDNchannel *ch, struct sk_buff *skb) test_and_clear_bit(FLG_L2_ACTIVATED, &dch->Flags); if (hw->protocol == ISDN_P_NT_S0) { + struct sk_buff_head free_queue; + + __skb_queue_head_init(&free_queue); hfcsusb_ph_command(hw, HFC_L1_DEACTIVATE_NT); spin_lock_irqsave(&hw->lock, flags); - skb_queue_purge(&dch->squeue); + skb_queue_splice_init(&dch->squeue, &free_queue); if (dch->tx_skb) { - dev_kfree_skb(dch->tx_skb); + __skb_queue_tail(&free_queue, dch->tx_skb); dch->tx_skb = NULL; } dch->tx_idx = 0; if (dch->rx_skb) { - dev_kfree_skb(dch->rx_skb); + __skb_queue_tail(&free_queue, dch->rx_skb); dch->rx_skb = NULL; } test_and_clear_bit(FLG_TX_BUSY, &dch->Flags); spin_unlock_irqrestore(&hw->lock, flags); + __skb_queue_purge(&free_queue); #ifdef FIXME if (test_and_clear_bit(FLG_L1_BUSY, &dch->Flags)) dchannel_sched_event(&hc->dch, D_CLEARBUSY); @@ -1344,7 +1348,7 @@ tx_iso_complete(struct urb *urb) printk("\n"); } - dev_kfree_skb(tx_skb); + dev_consume_skb_irq(tx_skb); tx_skb = NULL; if (fifo->dch && get_next_dframe(fifo->dch)) tx_skb = fifo->dch->tx_skb; -- 2.35.1