linux-kernel - Re: [PATCH resend v2 3/5] libata-scsi: use u8 array to store mode page copy

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Message-ID: <65ee2deb-200c-a467-1eb8-ed2eb5f14a70@cogentembedded.com>
Date:	Fri, 22 Jul 2016 12:59:01 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	tom.ty89@...il.com, tj@...nel.org, hare@...e.de, arnd@...db.de
Cc:	sfr@...b.auug.org.au, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org
Subject: Re: [PATCH resend v2 3/5] libata-scsi: use u8 array to store mode
 page copy

Hello.

On 7/22/2016 2:29 AM, tom.ty89@...il.com wrote:

> From: Tom Yan <tom.ty89@...il.com>
>
> ata_mselect_*() would initialize a char array for storing a copy of
> the current mode page. However, char could be signed char. In that
> case, bytes larger than 127 would be converted to negative number.
>
> For example, 0xff from def_control_mpage[] would become -1. This
> prevented ata_mselect_control() from working at all, since when it
> did the read-only bits check, there would always be a mismatch.
>
> Signed-off-by: Tom Yan <tom.ty89@...il.com>
>
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index 4a4e6f1..a28e2ea94 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -3610,7 +3610,7 @@ static int ata_mselect_caching(struct ata_queued_cmd *qc,
>  {
>  	struct ata_taskfile *tf = &qc->tf;
>  	struct ata_device *dev = qc->dev;
> -	char mpage[CACHE_MPAGE_LEN];
> +	u8 mpage[CACHE_MPAGE_LEN];
>  	u8 wce, mask;
>  	int i;
>
> @@ -3668,7 +3668,7 @@ static int ata_mselect_control(struct ata_queued_cmd *qc,
>  			       const u8 *buf, int len, u16 *fp)
>  {
>  	struct ata_device *dev = qc->dev;
> -	char mpage[CONTROL_MPAGE_LEN];
> +        u8 mpage[CONTROL_MPAGE_LEN];

    Indent with tabs please, as above.

[...]

MBR, Sergei