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authorJeffrey Hugo <jeffrey.l.hugo@gmail.com>2020-05-25 23:41:25 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2020-05-27 03:05:02 +0300
commit3be60b564de49875e47974c37fabced893cd0931 (patch)
tree0389b609b1021c19c98e38f9f5caeff2808431eb /drivers/scsi/ufs
parentf56577e8c7d0f3054f97d1f0d1cbe9a4d179cc47 (diff)
downloadlinux-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')
-rw-r--r--drivers/scsi/ufs/ufs-qcom.c6
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);
}
/**