Re: [PATCH v3 10/17] scsi: ufs: Fix a deadlock in the error handler
From: Bart Van Assche <bvanassche@acm.org>
Date: 2021-12-01 21:27:06
Subsystem:
scsi subsystem, the rest · Maintainers:
"James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
On 12/1/21 5:48 AM, Adrian Hunter wrote:
I think cmd_queue is not used anymore after this.
Let's remove cmd_queue via a separate patch. I have started testing this patch: Subject: [PATCH] scsi: ufs: Remove hba->cmd_queue Suggested-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> --- drivers/scsi/ufs/ufshcd.c | 11 +---------- drivers/scsi/ufs/ufshcd.h | 2 -- 2 files changed, 1 insertion(+), 12 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 5b3efc880246..d379c2b0c058 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c@@ -9409,7 +9409,6 @@ void ufshcd_remove(struct ufs_hba *hba) ufs_sysfs_remove_nodes(hba->dev); blk_cleanup_queue(hba->tmf_queue); blk_mq_free_tag_set(&hba->tmf_tag_set); - blk_cleanup_queue(hba->cmd_queue); scsi_remove_host(hba->host); /* disable interrupts */ ufshcd_disable_intr(hba, hba->intr_mask);
@@ -9630,12 +9629,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) goto out_disable; } - hba->cmd_queue = blk_mq_init_queue(&hba->host->tag_set); - if (IS_ERR(hba->cmd_queue)) { - err = PTR_ERR(hba->cmd_queue); - goto out_remove_scsi_host; - } - hba->tmf_tag_set = (struct blk_mq_tag_set) { .nr_hw_queues = 1, .queue_depth = hba->nutmrs,
@@ -9644,7 +9637,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) }; err = blk_mq_alloc_tag_set(&hba->tmf_tag_set); if (err < 0) - goto free_cmd_queue; + goto out_remove_scsi_host; hba->tmf_queue = blk_mq_init_queue(&hba->tmf_tag_set); if (IS_ERR(hba->tmf_queue)) { err = PTR_ERR(hba->tmf_queue);
@@ -9713,8 +9706,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) blk_cleanup_queue(hba->tmf_queue); free_tmf_tag_set: blk_mq_free_tag_set(&hba->tmf_tag_set); -free_cmd_queue: - blk_cleanup_queue(hba->cmd_queue); out_remove_scsi_host: scsi_remove_host(hba->host); out_disable:
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 411c6015bbfe..88c20f3608c2 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h@@ -738,7 +738,6 @@ struct ufs_hba_monitor { * @host: Scsi_Host instance of the driver * @dev: device handle * @lrb: local reference block - * @cmd_queue: Used to allocate command tags from hba->host->tag_set. * @outstanding_tasks: Bits representing outstanding task requests * @outstanding_lock: Protects @outstanding_reqs. * @outstanding_reqs: Bits representing outstanding transfer requests
@@ -805,7 +804,6 @@ struct ufs_hba { struct Scsi_Host *host; struct device *dev; - struct request_queue *cmd_queue; /* * This field is to keep a reference to "scsi_device" corresponding to * "UFS device" W-LU.