[PATCH v4 18/29] ufs: core: Allocate the SCSI host earlier

[Bart Van Assche <bvanassche@acm.org>]

Call ufshcd_add_scsi_host() before any UPIU commands are sent to the UFS
device. This patch prepares for letting ufshcd_add_scsi_host() allocate
memory for both SCSI and UPIU commands.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/ufs/core/ufshcd.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index f54599490c86..161d54a532fe 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -10577,6 +10577,9 @@ static int ufshcd_add_scsi_host(struct ufs_hba *hba)
 {
 	int err;
 
+	WARN_ON_ONCE(!hba->host->can_queue);
+	WARN_ON_ONCE(!hba->host->cmd_per_lun);
+
 	if (is_mcq_supported(hba)) {
 		ufshcd_mcq_enable(hba);
 		err = ufshcd_alloc_mcq(hba);
@@ -10727,7 +10730,11 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 	ufshcd_host_memory_configure(hba);
 
 	host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
-	host->cmd_per_lun = hba->nutrs - UFSHCD_NUM_RESERVED;
+	/*
+	 * Set the queue depth for WLUNs. ufs_get_device_desc() will increase
+	 * host->cmd_per_lun to a larger value.
+	 */
+	host->cmd_per_lun = 1;
 	host->max_id = UFSHCD_MAX_ID;
 	host->max_lun = UFS_MAX_LUNS;
 	host->max_channel = UFSHCD_MAX_CHANNEL;
@@ -10818,6 +10825,10 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 			    FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
 	}
 
+	err = ufshcd_add_scsi_host(hba);
+	if (err)
+		goto out_disable;
+
 	/* Hold auto suspend until async scan completes */
 	pm_runtime_get_sync(dev);
 
@@ -10868,10 +10879,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 	if (err)
 		goto out_disable;
 
-	err = ufshcd_add_scsi_host(hba);
-	if (err)
-		goto out_disable;
-
 	async_schedule(ufshcd_async_scan, hba);
 	ufs_sysfs_add_nodes(hba->dev);