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media: rcar_fdp1: fix pm_runtime_get_sync() usage count 

The pm_runtime_get_sync() internally increments the
dev->power.usage_count without decrementing it, even on errors.
Replace it by the new pm_runtime_resume_and_get(), introduced by:
commit dd8088d5a8 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
in order to properly decrement the usage counter, avoiding
a potential PM usage counter leak.

Also, right now, the driver is ignoring any troubles when
trying to do PM resume. So, add the proper error handling
for the code.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2021-04-23 16:59:34 +02:00
parent fa9f443f7c
commit 45e75a8c6f
1 changed files with 11 additions and 2 deletions
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13
drivers/media/platform/rcar_fdp1.c
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@ -2135,7 +2135,9 @@ static int fdp1_open(struct file *file)
}
/* Perform any power management required */
pm_runtime_get_sync(fdp1->dev);
ret = pm_runtime_resume_and_get(fdp1->dev);
if (ret < 0)
goto error_pm;
v4l2_fh_add(&ctx->fh);
@ -2145,6 +2147,8 @@ static int fdp1_open(struct file *file)
mutex_unlock(&fdp1->dev_mutex);
return 0;
error_pm:
v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
error_ctx:
v4l2_ctrl_handler_free(&ctx->hdl);
kfree(ctx);
@ -2352,7 +2356,9 @@ static int fdp1_probe(struct platform_device *pdev)
/* Power up the cells to read HW */
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(fdp1->dev);
ret = pm_runtime_resume_and_get(fdp1->dev);
if (ret < 0)
goto disable_pm;
hw_version = fdp1_read(fdp1, FD1_IP_INTDATA);
switch (hw_version) {
@ -2381,6 +2387,9 @@ static int fdp1_probe(struct platform_device *pdev)
return 0;
disable_pm:
pm_runtime_disable(fdp1->dev);
release_m2m:
v4l2_m2m_release(fdp1->m2m_dev);