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Message-ID: <b3334a8c-fb48-4b98-8571-8d85cbd4ed1e@acm.org>
Date: Tue, 17 Oct 2023 14:15:34 -0700
From: Bart Van Assche <bvanassche@....org>
To: Wenchao Hao <haowenchao2@...wei.com>,
"James E . J . Bottomley" <jejb@...ux.ibm.com>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
linux-scsi@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, louhongxiang@...wei.com
Subject: Re: [PATCH v2 1/2] scsi: core: cleanup scsi_dev_queue_ready()
On 10/15/23 19:08, Wenchao Hao wrote:
> + /*
> + * device_blocked is not set at mostly time, so check it first
> + * and return token when it is not set.
> + */
> + if (!atomic_read(&sdev->device_blocked))
> + return token;
This patch looks like an improvement to me. But I don't think that the
above comment is useful. I propose to move it into the patch
description.
> - /*
> - * unblock after device_blocked iterates to zero
> - */
> - if (atomic_dec_return(&sdev->device_blocked) > 0)
> - goto out_dec;
> - SCSI_LOG_MLQUEUE(3, sdev_printk(KERN_INFO, sdev,
> - "unblocking device at zero depth\n"));
> + /*
> + * unblock after device_blocked iterates to zero
> + */
> + if (scsi_device_busy(sdev) > 1 ||
> + atomic_dec_return(&sdev->device_blocked) > 0) {
> + sbitmap_put(&sdev->budget_map, token);
> + return -1;
> }
Please make the above comment match the new code, e.g. by changing it
into the following: "Only unblock if no other commands are pending and
if device_blocked has decreased to zero".
Thanks,
Bart.
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