linux-kernel - [PATCH] scsi: message: fusion: avoid flush_scheduled

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 22 Feb 2023 00:02:46 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Sathya Prakash <sathya.prakash@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>
Cc:     MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] scsi: message: fusion: avoid flush_scheduled_work() usage

Like commit c4f135d643823a86 ("workqueue: Wrap flush_workqueue() using a
macro") says, flush_scheduled_work() is dangerous and will be forbidden.

Commit 4d4109d0eb69 ("[SCSI] mpt fusion: Power Management fixes for MPT
SAS PCI-E controllers") added flush_scheduled_work() call into
mptscsih_suspend(). As of commit 4d4109d0eb69, there were several
schedule{,_delayed}_work() calls where flush_scheduled_work() from
mptscsih_suspend() meant to wait for completion, but which work items
is this flush_scheduled_work() call for was not explained.

Then, schedule_work("struct mptsas_hotplug_event"->work) and
schedule_work(MPT_ADAPTER->sas_persist_task) has been removed by
commit 3eb0822c6740 ("[SCSI] mpt fusion: Firmware event implementation
using seperate WorkQueue"), and
schedule_work("struct mptsas_send_discovery_event"->work) has been
removed by commit f9c34022eae9 ("[SCSI] mpt fusion: SAS topology scan
changes, expander events").

There still remains schedule_work("struct work_queue_wrapper"->work) call
in mptspi.c and schedule_delayed_work("struct mpt_lan_priv"->work) call in
mptlan.c , but I guess that these are not work items which
commit 4d4109d0eb69 meant to wait for completion because these are not per
MPT_ADAPTER work items. If my guess is correct, we no longer need to call
flush_scheduled_work() from mptscsih_suspend().

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---
 drivers/message/fusion/mptscsih.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index 276084ed04a6..2bc17087d17d 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -1231,7 +1231,6 @@ mptscsih_suspend(struct pci_dev *pdev, pm_message_t state)
 	MPT_ADAPTER 		*ioc = pci_get_drvdata(pdev);

 	scsi_block_requests(ioc->sh);
-	flush_scheduled_work();
 	mptscsih_shutdown(pdev);
 	return mpt_suspend(pdev,state);
 }
-- 
2.18.4