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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id d2sm13632095pfc.7.2020.05.25.13.41.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 May 2020 13:41:29 -0700 (PDT) From: Jeffrey Hugo To: agross@kernel.org, bjorn.andersson@linaro.org, alim.akhtar@samsung.com, avri.altman@wdc.com, jejb@linux.ibm.com, martin.petersen@oracle.com, subhashj@codeaurora.org, venkatg@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffrey Hugo Subject: [PATCH] scsi: ufs-qcom: Fix scheduling while atomic issue Date: Mon, 25 May 2020 13:41:25 -0700 Message-Id: <20200525204125.46171-1-jeffrey.l.hugo@gmail.com> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ufs_qcom_dump_dbg_regs() uses usleep_range, a sleeping function, but can be called from atomic context in the following flow: ufshcd_intr -> ufshcd_sl_intr -> ufshcd_check_errors -> ufshcd_print_host_regs -> ufshcd_vops_dbg_register_dump -> ufs_qcom_dump_dbg_regs This causes a boot crash on the Lenovo Miix 630 when the interrupt is handled on the idle thread. Fix the issue by switching to udelay(). Fixes: 9c46b8676271 ("scsi: ufs-qcom: dump additional testbus registers") Signed-off-by: Jeffrey Hugo --- drivers/scsi/ufs/ufs-qcom.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 19aa5c44e0da..f938867301a0 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1658,11 +1658,11 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba) /* sleep a bit intermittently as we are dumping too much data */ ufs_qcom_print_hw_debug_reg_all(hba, NULL, ufs_qcom_dump_regs_wrapper); - usleep_range(1000, 1100); + udelay(1000); ufs_qcom_testbus_read(hba); - usleep_range(1000, 1100); + udelay(1000); ufs_qcom_print_unipro_testbus(hba); - usleep_range(1000, 1100); + udelay(1000); } /** -- 2.17.1