| Message ID | 20200525204125.46171-1-jeffrey.l.hugo@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | scsi: ufs-qcom: Fix scheduling while atomic issue | expand |
On Tue, 2020-05-26 at 06:25 +0000, Avri Altman wrote: > > > 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 <jeffrey.l.hugo@gmail.com> > > Reviewed-by: Avri Altman <avri.altman@wdc.com> Reviewed-by: Bean Huo <beanhuo@micron.com>
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); } /**
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 <jeffrey.l.hugo@gmail.com> --- drivers/scsi/ufs/ufs-qcom.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)