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Message-Id: <20251002060058.25087-1-make24@iscas.ac.cn>
Date: Thu, 2 Oct 2025 14:00:58 +0800
From: Ma Ke <make24@...as.ac.cn>
To: sakari.ailus@...ux.intel.com,
bingbu.cao@...el.com,
lixu.zhang@...el.com,
stanislaw.gruszka@...ux.intel.com,
mchehab@...nel.org
Cc: linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org,
Ma Ke <make24@...as.ac.cn>
Subject: [PATCH v6] media: pci: intel: ivsc: improve device reference counting in mei_ace driver
Put the reference to csi_dev acquired during driver probe in
mei_ace_setup_dev_link() inside the same function, instead of during
driver unbind in mei_ace_remove(). This can be done as
device_link_add() already takes a reference to csi_dev.
Found by code review.
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
Changes in v6:
- modified the commit message as suggestions;
Changes in v5:
- jumped to err instead of err_put to avoid calling put_device() again in err_put as reviewer's instructions;
Changes in v4:
- updated the subject as suggestions;
Changes in v3:
- deleted the tag of Fixes and CC, and moved put_device() to immediately after device_link_add() as suggestions;
Changes in v2:
- modified the put_device() operations and the patch title as suggestions.
---
drivers/media/pci/intel/ivsc/mei_ace.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/media/pci/intel/ivsc/mei_ace.c b/drivers/media/pci/intel/ivsc/mei_ace.c
index 98310b8511b1..b306a320b70f 100644
--- a/drivers/media/pci/intel/ivsc/mei_ace.c
+++ b/drivers/media/pci/intel/ivsc/mei_ace.c
@@ -414,10 +414,11 @@ static int mei_ace_setup_dev_link(struct mei_ace *ace)
/* setup link between mei_ace and mei_csi */
ace->csi_link = device_link_add(csi_dev, dev, DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE | DL_FLAG_STATELESS);
+ put_device(csi_dev);
if (!ace->csi_link) {
ret = -EINVAL;
dev_err(dev, "failed to link to %s\n", dev_name(csi_dev));
- goto err_put;
+ goto err;
}
ace->csi_dev = csi_dev;
@@ -522,7 +523,6 @@ static void mei_ace_remove(struct mei_cl_device *cldev)
cancel_work_sync(&ace->work);
device_link_del(ace->csi_link);
- put_device(ace->csi_dev);
pm_runtime_disable(&cldev->dev);
pm_runtime_set_suspended(&cldev->dev);
--
2.17.1
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