From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751438AbdFAIQF (ORCPT ); Thu, 1 Jun 2017 04:16:05 -0400 Received: from m12-12.163.com ([220.181.12.12]:46846 "EHLO m12-12.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751090AbdFAIQD (ORCPT ); Thu, 1 Jun 2017 04:16:03 -0400 From: Jia-Ju Bai To: harish.patil@cavium.com, manish.chopra@cavium.com, Dept-GELinuxNICDev@cavium.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jia-Ju Bai Subject: [PATCH] qlcnic: Fix a sleep-in-atomic bug in qlcnic_82xx_hw_write_wx_2M and qlcnic_82xx_hw_read_wx_2M Date: Thu, 1 Jun 2017 16:18:10 +0800 Message-Id: <1496305090-17814-1-git-send-email-baijiaju1990@163.com> X-Mailer: git-send-email 1.7.9.5 X-CM-TRANSID: DMCowACnr5s5zS9ZtytZHg--.38640S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7JF1kCrWxWFyUAF4DJFyUtrb_yoWDArXEgF 4kZr1xXw45Gr9xKa1ayr43GryYv3ZrWF4fA3WxWay3J3yDAFW5G3srJFy8XrnxWa18ZFy7 GF1avayrA34IyjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IUbg4S3UUUUU== X-Originating-IP: [166.111.70.19] X-CM-SenderInfo: xedlyx5dmximizq6il2tof0z/1tbiHh3pelSIVWYV2AAAsy Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The driver may sleep under a write spin lock, and the function call path is: qlcnic_82xx_hw_write_wx_2M (acquire the lock by write_lock_irqsave) crb_win_lock qlcnic_pcie_sem_lock usleep_range qlcnic_82xx_hw_read_wx_2M (acquire the lock by write_lock_irqsave) crb_win_lock qlcnic_pcie_sem_lock usleep_range To fix it, the usleep_range is replaced with udelay. Signed-off-by: Jia-Ju Bai --- drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c index 838cc0c..7848cf0 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c @@ -341,7 +341,7 @@ static void qlcnic_write_window_reg(u32 addr, void __iomem *bar0, u32 data) } return -EIO; } - usleep_range(1000, 1500); + udelay(1200); } if (id_reg) -- 1.7.9.5