FWIW, I end up using `bool d_sense = (dev->flags &
ATA_DFLAG_D_SENSE)`, which was introduced to ata_scsi_set_sense() in
commit 06dbde5f3a44 ("libata: Implement control mode page to select
sense format"), in the polished ata_msense_control().
@Sergei, I kept the parentheses for the bit shifting/masking results
because it appears that the rest of the code in libata-scsi.c does
that as well. So I am not going to partially clean up that to avoid
making it look inconsistent.
On 20 July 2016 at 04:39, <tom.ty89@xxxxxxxxx> wrote:
> From: Tom Yan <tom.ty89@xxxxxxxxx>
>
> `changeable` is the "version" of mode page requested by the user.
> It will be less confusing/misleading if we do not check it
> "together" with the setting bits of the drive.
>
> Not to mention that we currently have ata_mselect_*() implemented
> in a way that each of them will serve exclusively a particular bit
> on each page. The old style will hence make the condition look even
> more unnecessarily arcane if the ata_msense_*() is reflecting more
> than one bit.
>
> Signed-off-by: Tom Yan <tom.ty89@xxxxxxxxx>
>
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index bf4cb21..b00521b 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -2424,10 +2424,12 @@ static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
> static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
> {
> modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
> - if (changeable || ata_id_wcache_enabled(id))
> - buf[2] |= (1 << 2); /* write cache enable */
> - if (!changeable && !ata_id_rahead_enabled(id))
> - buf[12] |= (1 << 5); /* disable read ahead */
> + if (changeable) {
> + buf[2] |= (1 << 2); /* ata_mselect_caching() */
> + } else {
> + buf[2] |= (ata_id_wcache_enabled(id) << 2); /* write cache enable */
> + buf[12] |= (!ata_id_rahead_enabled(id) << 5); /* disable read ahead */
> + }
> return sizeof(def_cache_mpage);
> }
>
> @@ -2446,8 +2448,13 @@ static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf,
> bool changeable)
> {
> modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
> - if (changeable || (dev->flags & ATA_DFLAG_D_SENSE))
> - buf[2] |= (1 << 2); /* Descriptor sense requested */
> + if (changeable) {
> + buf[2] |= (1 << 2); /* ata_mselect_control() */
> + } else {
> + bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
> +
> + buf[2] |= (d_sense << 2); /* descriptor format sense data */
> + }
> return sizeof(def_control_mpage);
> }
>
> --
> 2.9.0
>
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