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Message-Id: <20200623195307.630309589@linuxfoundation.org>
Date: Tue, 23 Jun 2020 21:58:54 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Bean Huo <beanhuo@...ron.com>,
Avri Altman <avri.altman@....com>,
Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 078/136] scsi: ufs-qcom: Fix scheduling while atomic issue
From: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
[ Upstream commit 3be60b564de49875e47974c37fabced893cd0931 ]
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().
Link: https://lore.kernel.org/r/20200525204125.46171-1-jeffrey.l.hugo@gmail.com
Fixes: 9c46b8676271 ("scsi: ufs-qcom: dump additional testbus registers")
Reviewed-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Avri Altman <avri.altman@....com>
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
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 f2b8de195d8af..ee3589ac64abf 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1649,11 +1649,11 @@ 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);
}
/**
--
2.25.1
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