From: Daniel Wagner <dwagner@suse.de>
To: Bart Van Assche <bvanassche@acm.org>
Cc: "Martin K . Petersen" <martin.petersen@oracle.com>,
"James E . J . Bottomley" <jejb@linux.vnet.ibm.com>,
linux-scsi@vger.kernel.org,
Himanshu Madhani <hmadhani@marvell.com>,
Roman Bolshakov <r.bolshakov@yadro.com>,
Quinn Tran <qutran@marvell.com>, Martin Wilck <mwilck@suse.com>
Subject: Re: [PATCH v2 2/6] qla2xxx: Simplify the code for aborting SCSI commands
Date: Fri, 24 Jan 2020 11:44:08 +0100 [thread overview]
Message-ID: <20200124104408.lrapyyu2vkmlx676@beryllium.lan> (raw)
In-Reply-To: <b110ffaa-aeaa-7454-d64a-cf35124aca7b@acm.org>
Hi Bart,
On Thu, Jan 23, 2020 at 07:12:04PM -0800, Bart Van Assche wrote:
> >> +/*
> >> + * The caller must ensure that no completion interrupts will happen
> >> + * while this function is in progress.
> >> + */
> >
> > So could we add something like WARN_ON(irqs_disabled())?
>
> qla2x00_abort_all_cmds() is typically called after the kernel driver
> discovered that the firmware stopped processing commands. If the
> firmware has stopped processing commands it is safe to call this
> function without disabling interrupts. Even if the caller would disable
> interrupts, that would only disable interrupts on the local CPU but not
> on other CPUs. Additionally, disabling interrupts is not a proper
> solution because if a completion interrupt arrives after a command has
> been aborted that will cause trouble if the command handle has already
> been associated with another command.
Thanks for the explenation. I understood the comment as 'interrupts'
have to be disabled when calling this function.
Thanks,
Daniel
next prev parent reply other threads:[~2020-01-24 10:44 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-23 4:23 [PATCH v2 0/6] qla2xxx patches for kernel v5.6 Bart Van Assche
2020-01-23 4:23 ` [PATCH v2 1/6] qla2xxx: Check locking assumptions at runtime in qla2x00_abort_srb() Bart Van Assche
2020-01-23 8:08 ` Daniel Wagner
2020-01-23 4:23 ` [PATCH v2 2/6] qla2xxx: Simplify the code for aborting SCSI commands Bart Van Assche
2020-01-23 10:17 ` Daniel Wagner
2020-01-24 3:12 ` Bart Van Assche
2020-01-24 10:44 ` Daniel Wagner [this message]
2020-01-23 4:23 ` [PATCH v2 3/6] qla2xxx: Suppress endianness complaints in qla2x00_configure_local_loop() Bart Van Assche
2020-01-23 10:35 ` Daniel Wagner
2020-01-23 4:23 ` [PATCH v2 4/6] qla2xxx: Fix sparse warnings triggered by the PCI state checking code Bart Van Assche
2020-01-23 10:36 ` Daniel Wagner
2020-02-25 18:09 ` Roman Bolshakov
2020-01-23 4:23 ` [PATCH v2 5/6] qla2xxx: Convert MAKE_HANDLE() from a define into an inline function Bart Van Assche
2020-01-23 10:39 ` Daniel Wagner
2020-01-24 3:13 ` Bart Van Assche
2020-01-23 4:23 ` [PATCH v2 6/6] qla2xxx: Fix the endianness annotations for the port attribute max_frame_size member Bart Van Assche
2020-01-23 10:47 ` Daniel Wagner
2020-02-25 18:43 ` Roman Bolshakov
2020-02-25 19:40 ` Bart Van Assche
2020-02-05 2:36 ` [PATCH v2 0/6] qla2xxx patches for kernel v5.6 Martin K. Petersen
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