From: John Garry <john.garry@huawei.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
<linux-scsi@vger.kernel.org>
Cc: Finn Thain <fthain@telegraphics.com.au>,
<GR-QLogic-Storage-Upstream@marvell.com>,
Hannes Reinecke <hare@kernel.org>,
Jack Wang <jinpu.wang@cloud.ionos.com>,
<linux-m68k@lists.linux-m68k.org>,
Manish Rangankar <mrangankar@marvell.com>,
Michael Schmitz <schmitzmic@gmail.com>,
<MPT-FusionLinux.pdl@broadcom.com>,
Nilesh Javali <njavali@marvell.com>,
Sathya Prakash <sathya.prakash@broadcom.com>,
Sreekanth Reddy <sreekanth.reddy@broadcom.com>,
Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>,
Vikram Auradkar <auradkar@google.com>,
Xiang Chen <chenxiang66@hisilicon.com>,
Xiaofei Tan <tanxiaofei@huawei.com>,
"James E . J . Bottomley" <jejb@linux.ibm.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Ahmed S . Darwish" <a.darwish@linutronix.de>
Subject: Re: [PATCH 02/14] scsi: hisi_sas: Remove preemptible().
Date: Thu, 26 Nov 2020 14:10:43 +0000 [thread overview]
Message-ID: <f405bce8-5929-b91a-2e42-12cdb7f08867@huawei.com> (raw)
In-Reply-To: <20201126132952.2287996-3-bigeasy@linutronix.de>
On 26/11/2020 13:29, Sebastian Andrzej Siewior wrote:
> From: "Ahmed S. Darwish"<a.darwish@linutronix.de>
>
> hisi_sas_task_exec() uses preemptible() to see if it's safe to block.
> This does not work for CONFIG_PREEMPT_COUNT=n kernels in which
> preemptible() always returns 0.
>
> The problem is masked when enabling some of the common Kconfig.debug
> options (like CONFIG_DEBUG_ATOMIC_SLEEP), as they implicitly enable the
> preemption counter.
>
> In general, driver leaf functions should not make logic decisions based
> on the context they're called from. The caller should be the entity
> responsible for explicitly indicating context.
>
> Since hisi_sas_task_exec() already has a gfp_t flags parameter, use it
> as the explicit context marker.
>
> Fixes: 214e702d4b70 ("scsi: hisi_sas: Adjust task reject period during host reset")
> Fixes: 550c0d89d52d ("scsi: hisi_sas: Replace in_softirq() check in hisi_sas_task_exec()")
> Signed-off-by: Ahmed S. Darwish<a.darwish@linutronix.de>
> Signed-off-by: Sebastian Andrzej Siewior<bigeasy@linutronix.de>
> Cc: Xiaofei Tan<tanxiaofei@huawei.com>
> Cc: Xiang Chen<chenxiang66@hisilicon.com>
> Cc: John Garry<john.garry@huawei.com>
Acked-by: John Garry <john.garry@huawei.com>
next prev parent reply other threads:[~2020-11-26 14:11 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-26 13:29 [PATCH 00/14] scsi: Remove in_interrupt() usage Sebastian Andrzej Siewior
2020-11-26 13:29 ` [PATCH 01/14] scsi: pm80xx: Do not sleep in atomic context Sebastian Andrzej Siewior
2020-11-26 13:58 ` Jinpu Wang
2020-11-26 13:29 ` [PATCH 02/14] scsi: hisi_sas: Remove preemptible() Sebastian Andrzej Siewior
2020-11-26 14:10 ` John Garry [this message]
2020-11-26 13:29 ` [PATCH 03/14] scsi: qla4xxx: qla4_82xx_crb_win_lock(): Remove in_interrupt() Sebastian Andrzej Siewior
2020-11-30 13:54 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 04/14] scsi: qla2xxx: qla82xx: " Sebastian Andrzej Siewior
2020-11-30 10:59 ` Daniel Wagner
2020-11-30 19:11 ` Himanshu Madhani
2020-11-26 13:29 ` [PATCH 05/14] scsi: qla2xxx: tcm_qla2xxx: Remove BUG_ON(in_interrupt()) Sebastian Andrzej Siewior
2020-11-30 11:02 ` Daniel Wagner
2020-11-30 19:13 ` Himanshu Madhani
2020-11-26 13:29 ` [PATCH 06/14] scsi: qla2xxx: init/os: Remove in_interrupt() Sebastian Andrzej Siewior
2020-11-30 13:26 ` Daniel Wagner
2020-11-30 19:14 ` Himanshu Madhani
2020-11-26 13:29 ` [PATCH 07/14] scsi: qla4xxx: qla4_82xx_idc_lock(): " Sebastian Andrzej Siewior
2020-11-30 14:20 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 08/14] scsi: qla4xxx: qla4_82xx_rom_lock(): " Sebastian Andrzej Siewior
2020-11-30 14:33 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 09/14] scsi: mpt3sas: " Sebastian Andrzej Siewior
2020-11-30 15:16 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 10/14] scsi: myrb: Remove WARN_ON(in_interrupt()) Sebastian Andrzej Siewior
2020-11-30 15:21 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 11/14] scsi: myrs: " Sebastian Andrzej Siewior
2020-11-30 15:21 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 12/14] scsi: NCR5380: Remove in_interrupt() Sebastian Andrzej Siewior
2020-11-27 4:37 ` Finn Thain
2020-11-27 21:15 ` Finn Thain
2020-11-27 21:48 ` Finn Thain
2020-11-28 7:28 ` Ahmed S. Darwish
2020-11-30 0:21 ` Finn Thain
2020-11-29 6:54 ` Michael Schmitz
2020-11-30 0:15 ` Finn Thain
2020-11-30 2:42 ` Michael Schmitz
2020-11-26 13:29 ` [PATCH 13/14] scsi: message: fusion: Remove in_interrupt() usage in mpt_config() Sebastian Andrzej Siewior
2020-11-30 15:30 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 14/14] scsi: message: fusion: Remove in_interrupt() usage in mptsas_cleanup_fw_event_q() Sebastian Andrzej Siewior
2020-11-30 16:07 ` Daniel Wagner
2020-12-01 5:06 ` [PATCH 00/14] scsi: Remove in_interrupt() usage Martin K. Petersen
2020-12-01 9:08 ` Sebastian Andrzej Siewior
2020-12-08 4:51 ` Martin K. Petersen
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