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SubjectRe: [PATCH] scsi: ufs-qcom: Fix scheduling while atomic issue
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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>

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