linux-kernel - Re: [PATCH v2 2/2] mtd: rawnand: qcom: Fix broken reset in misc_cmd_type in exec

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Date: Tue, 26 Mar 2024 13:12:23 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Md Sadre Alam <quic_mdalam@...cinc.com>,
	Sricharan Ramabadhran <quic_srichara@...cinc.com>,
	linux-mtd@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 2/2] mtd: rawnand: qcom: Fix broken reset in
 misc_cmd_type in exec_op

On Mon, Mar 25, 2024 at 11:30:48AM +0100, Christian Marangi wrote:
> misc_cmd_type in exec_op have multiple problems. With commit a82990c8a409
> ("mtd: rawnand: qcom: Add read/read_start ops in exec_op path") it was
> reworked and generalized but actually dropped the handling of the
> RESET_DEVICE command.
> 
> The rework itself was correct with supporting case where a single misc
> command is handled, but became problematic by the addition of exiting
> early if we didn't had an ERASE or an OP_PROGRAM_PAGE operation.
> 
> Add additional logic to handle the reset command and return early only
> if we don't have handling for the requested command.
> 
> Fixes: a82990c8a409 ("mtd: rawnand: qcom: Add read/read_start ops in exec_op path")
> Cc: stable@...r.kernel.org
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
> Changes v2:
> - Add this patch
> 
>  drivers/mtd/nand/raw/qcom_nandc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
> index 19d76e345a49..b8cff9240b28 100644
> --- a/drivers/mtd/nand/raw/qcom_nandc.c
> +++ b/drivers/mtd/nand/raw/qcom_nandc.c
> @@ -2815,7 +2815,7 @@ static int qcom_misc_cmd_type_exec(struct nand_chip *chip, const struct nand_sub
>  			      host->cfg0_raw & ~(7 << CW_PER_PAGE));
>  		nandc_set_reg(chip, NAND_DEV0_CFG1, host->cfg1_raw);
>  		instrs = 3;
> -	} else {
> +	} else if (q_op.cmd_reg != OP_RESET_DEVICE) {

But this will fail if the previous patch is not applied. So this makes me think
that you are trying to fix the OP_RESET_DEVICE command with these 2 patches.

- Mani

-- 
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