Re: [PATCH] Change synchronize_rcu() in scsi_device_quiesce() into synchronize_sched()

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On 03/16/18 14:42, Martin Steigerwald wrote:
What is this one about?

Fix for the regression I (and others?) reported?¹

[1] [Bug 199077] [Possible REGRESSION, 4.16-rc4] Error updating SMART data
during runtime and boot failures with blk_mq_terminate_expired in backtrace

https://bugzilla.kernel.org/show_bug.cgi?id=199077

Hello Martin,

This patch is a fix for the fix for the bug that you and others had reported. See also "I/O hangs after resuming from suspend-to-ram" (https://marc.info/?l=linux-block&m=150340235201348).

This patch fixes an API violation. For those users for which suspend and resume works fine with commit 3a0a529971ec applied it should still work fine with this patch applied since this patch may cause scsi_device_quiesce() to wait longer.

Bart.



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