linux-kernel - Re: [PATCH] mtd: rawnand: au1550nd: Fix au_read

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Date:   Fri, 4 Oct 2019 14:42:05 -0400
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Paul Burton <paul.burton@...s.com>
Cc:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paul Burton <pburton@...ecomp.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] mtd: rawnand: au1550nd: Fix au_read_buf16() prototype

On Fri, 4 Oct 2019 18:38:33 +0000
Paul Burton <paul.burton@...s.com> wrote:

> Commit 7e534323c416 ("mtd: rawnand: Pass a nand_chip object to
> chip->read_xxx() hooks") modified the prototype of the struct nand_chip
> read_buf function pointer. In the au1550nd driver we have 2
> implementations of read_buf. The previously mentioned commit modified
> the au_read_buf() implementation to match the function pointer, but not
> au_read_buf16(). This results in a compiler warning for MIPS
> db1xxx_defconfig builds:
> 
>   drivers/mtd/nand/raw/au1550nd.c:443:57:
>     warning: pointer type mismatch in conditional expression
> 
> Fix this by updating the prototype of au_read_buf16() to take a struct
> nand_chip pointer as its first argument, as is expected after commit
> 7e534323c416 ("mtd: rawnand: Pass a nand_chip object to chip->read_xxx()
> hooks").
> 
> Note that this shouldn't have caused any functional issues at runtime,
> since the offset of the struct mtd_info within struct nand_chip is 0
> making mtd_to_nand() effectively a type-cast.
> 
> Signed-off-by: Paul Burton <paul.burton@...s.com>
> Fixes: 7e534323c416 ("mtd: rawnand: Pass a nand_chip object to chip->read_xxx() hooks")
> Cc: Boris Brezillon <bbrezillon@...nel.org>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> Cc: Miquel Raynal <miquel.raynal@...tlin.com>
> Cc: David Woodhouse <dwmw2@...radead.org>
> Cc: Brian Norris <computersforpeace@...il.com>
> Cc: Marek Vasut <marek.vasut@...il.com>
> Cc: Vignesh Raghavendra <vigneshr@...com>
> Cc: linux-mtd@...ts.infradead.org
> Cc: linux-mips@...r.kernel.org
> Cc: stable@...r.kernel.org # v4.20+
> 
> ---
> 
>  drivers/mtd/nand/raw/au1550nd.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/au1550nd.c b/drivers/mtd/nand/raw/au1550nd.c
> index 97a97a9ccc36..2bc818dea2a8 100644
> --- a/drivers/mtd/nand/raw/au1550nd.c
> +++ b/drivers/mtd/nand/raw/au1550nd.c
> @@ -140,10 +140,9 @@ static void au_write_buf16(struct nand_chip *this, const u_char *buf, int len)
>   *
>   * read function for 16bit buswidth
>   */
> -static void au_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
> +static void au_read_buf16(struct nand_chip *this, u_char *buf, int len)
>  {
>  	int i;
> -	struct nand_chip *this = mtd_to_nand(mtd);
>  	u16 *p = (u16 *) buf;
>  	len >>= 1;
>