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| author | Jeffrey Hugo <jeffrey.l.hugo@gmail.com> | 2020-05-25 13:41:25 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-25 15:33:00 +0200 |
| commit | 8c9f4d5034e5ffbb7185bdaedcd7f5c80a364216 (patch) | |
| tree | c0e034d5236f076a77290a9553ede472a3df1e55 /drivers/scsi/ufs | |
| parent | 92d1e76a60bb9f97ce2d6d8f8adab70c60a12a9e (diff) | |
| download | linux-stable-8c9f4d5034e5ffbb7185bdaedcd7f5c80a364216.tar.gz linux-stable-8c9f4d5034e5ffbb7185bdaedcd7f5c80a364216.tar.bz2 linux-stable-8c9f4d5034e5ffbb7185bdaedcd7f5c80a364216.zip | |
scsi: ufs-qcom: Fix scheduling while atomic issue
[ 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@micron.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/scsi/ufs')
| -rw-r--r-- | drivers/scsi/ufs/ufs-qcom.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 75ee5906b966..21e3ff590ec9 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1635,11 +1635,11 @@ 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); } /** |