[PATCH] clk: imx: imx8qxp-lpcg: fix runtime PM cleanup on error path

[Peng Fan (OSS)]

> Subject: [PATCH] clk: imx: imx8qxp-lpcg: fix runtime PM cleanup on
> error path
> 
> imx_lpcg_parse_clks_from_dt() takes a runtime PM usage reference
> with
> pm_runtime_get_noresume() and enables autosuspend with
> pm_runtime_use_autosuspend(). The success path drops the usage
> reference with pm_runtime_put_autosuspend(), but the error path only
> disables runtime PM.
> 
> As a result, the reference taken by pm_runtime_get_noresume()
> remains unbalanced on registration failure. The autosuspend setting is
> also left enabled instead of being undone with
> pm_runtime_dont_use_autosuspend().
> 
> Add pm_runtime_dont_use_autosuspend() to undo the autosuspend
> setting and pm_runtime_put_noidle() to drop the usage reference on
> the error path.
> 
> This issue was found by manual code inspection.
> 
> Fixes: 18cdbad40c6c ("clk: imx: clk-imx8qxp-lpcg: add runtime pm
> support")
> Cc: stable at vger.kernel.org
> Signed-off-by: Guangshuo Li <lgs201920130244 at gmail.com>

Reviewed-by: Peng Fan <peng.fan at nxp.com>