[Patch v2 2/7] firmware_loader: Stop pinning parent device per workqueue invocation

["Pratik R. Sampat" <prsampat@amd.com>]

From: Dan Williams <djbw@kernel.org>

The device core pins parent devices while children are registered. As long
as all usage of the parent device by the firmware_loader ends at
firmware_upload_unregister(), no per queue_work() reference is needed.

Now that firmware_upload_unregister() holds its own parent device reference
over the child device_del() and flush_work() events, the per queue_work()
reference can be deleted.

Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Russ Weight <russ.weight@linux.dev>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Chao Gao <chao.gao@intel.com>
Signed-off-by: Dan Williams <djbw@kernel.org>
[chao.gao@intel.com: drop unused fw_dev in fw_upload_start()]
Signed-off-by: Pratik R. Sampat <prsampat@amd.com>
---
 drivers/base/firmware_loader/sysfs_upload.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/base/firmware_loader/sysfs_upload.c b/drivers/base/firmware_loader/sysfs_upload.c
index 6f2123538682..890a242a7c20 100644
--- a/drivers/base/firmware_loader/sysfs_upload.c
+++ b/drivers/base/firmware_loader/sysfs_upload.c
@@ -176,7 +176,7 @@ static void fw_upload_main(struct work_struct *work)
 	ret = fwlp->ops->prepare(fwl, fwlp->data, fwlp->remaining_size);
 	if (ret != FW_UPLOAD_ERR_NONE) {
 		fw_upload_set_error(fwlp, ret);
-		goto putdev_exit;
+		goto out;
 	}
 
 	fw_upload_update_progress(fwlp, FW_UPLOAD_PROG_TRANSFERRING);
@@ -205,9 +205,7 @@ static void fw_upload_main(struct work_struct *work)
 	if (fwlp->ops->cleanup)
 		fwlp->ops->cleanup(fwl);
 
-putdev_exit:
-	put_device(fw_dev->parent);
-
+out:
 	/*
 	 * Note: fwlp->remaining_size is left unmodified here to provide
 	 * additional information on errors. It will be reinitialized when
@@ -228,7 +226,6 @@ static void fw_upload_main(struct work_struct *work)
 int fw_upload_start(struct fw_sysfs *fw_sysfs)
 {
 	struct fw_priv *fw_priv = fw_sysfs->fw_priv;
-	struct device *fw_dev = &fw_sysfs->dev;
 	struct fw_upload_priv *fwlp;
 
 	if (!fw_sysfs->fw_upload_priv)
@@ -249,8 +246,6 @@ int fw_upload_start(struct fw_sysfs *fw_sysfs)
 		return -EBUSY;
 	}
 
-	get_device(fw_dev->parent); /* released in fw_upload_main */
-
 	fwlp->progress = FW_UPLOAD_PROG_RECEIVING;
 	fwlp->err_code = 0;
 	fwlp->remaining_size = fw_priv->size;
-- 
2.43.0