linux-kernel - Re: [PATCH 5.4 007/320] mtd: rawnand: gpmi: Add ERR007117 protection for nfc_apply

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Message-ID: <20220124204148.GB19321@duo.ucw.cz>
Date:   Mon, 24 Jan 2022 21:41:48 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Stefan Riedmueller <s.riedmueller@...tec.de>,
        Christian Eggers <ceggers@...i.de>, Han Xu <han.xu@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: Re: [PATCH 5.4 007/320] mtd: rawnand: gpmi: Add ERR007117 protection
 for nfc_apply_timings

Hi!

> commit f53d4c109a666bf1a4883b45d546fba079258717 upstream.
> 
> gpmi_io clock needs to be gated off when changing the parent/dividers of
> enfc_clk_root (i.MX6Q/i.MX6UL) respectively qspi2_clk_root (i.MX6SX).
> Otherwise this rate change can lead to an unresponsive GPMI core which
> results in DMA timeouts and failed driver probe:
...

> @@ -2429,7 +2449,9 @@ static int gpmi_nfc_exec_op(struct nand_
>  	 */
>  	if (this->hw.must_apply_timings) {
>  		this->hw.must_apply_timings = false;
> -		gpmi_nfc_apply_timings(this);
> +		ret = gpmi_nfc_apply_timings(this);
> +		if (ret)
> +			return ret;
>  	}
>  
>  	dev_dbg(this->dev, "%s: %d instructions\n", __func__, op->ninstrs);
>

AFAICT this leaks pm reference in the error case. Not sure what
variant is right, there, so...

Best regards,
								Pavel

diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
index 1b64c5a5140d..06840cff6945 100644
--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
@@ -2284,8 +2284,10 @@ static int gpmi_nfc_exec_op(struct nand_chip *chip,
 	if (this->hw.must_apply_timings) {
 		this->hw.must_apply_timings = false;
 		ret = gpmi_nfc_apply_timings(this);
-		if (ret)
+		if (ret) {
+			pm_runtime_put_....(this->dev);
 			return ret;
+		}
 	}
 
 	dev_dbg(this->dev, "%s: %d instructions\n", __func__, op->ninstrs);


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