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| author | Jeffrey Hugo <jeffrey.l.hugo@gmail.com> | 2020-05-25 23:41:25 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-05-27 03:05:02 +0300 |
| commit | 3be60b564de49875e47974c37fabced893cd0931 (patch) | |
| tree | 0389b609b1021c19c98e38f9f5caeff2808431eb /drivers/scsi/ufs/ufs-qcom.c | |
| parent | f56577e8c7d0f3054f97d1f0d1cbe9a4d179cc47 (diff) | |
| download | linux-3be60b564de49875e47974c37fabced893cd0931.tar.xz | |
scsi: ufs-qcom: Fix scheduling while atomic issue
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>
Diffstat (limited to 'drivers/scsi/ufs/ufs-qcom.c')
| -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 00ce8d6cbb36..2e6ddb5cdfc2 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); } /** |