On Mon, 6 Apr 2009, Jeff Garzik wrote: > Arjan van de Ven wrote: > > On Sun, 05 Apr 2009 16:57:21 -0400 > > Jeff Garzik <jeff@xxxxxxxxxx> wrote: > > > We set it in libata-scsi.c:ata_scsi_dev_config() based on > > > ata_id_is_ssd() > > > > > > That hueristic probably assumes Intel SSDs or something :/ > > > > you mean the "rpm" set to '1' ? > > I was pretty sure that that was industry standard... > > A -new- industry standard. You can certainly create a compliant SSD while > only conforming to ATA-7, for example. Some older IDE flash devices pretend > they are normal hard drives in almost every respect, too. Something like this might be a good idea. I've seen several SSD's that do _not_ do that whole RPM == 1 thing, but they have "SSD" in their names. I forget how the ID is stored (I have this memory of it being big-endian 16-bit words or something crazy like that?), but aside from fixing up that kind of crazyness, maybe something like this is worth it? And making it non-inline, of course. And maybe it should use 'strstr()' instead of checking whether the name ends in 'SSD'. You get the idea.. Linus --- --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -769,7 +769,14 @@ static inline int ata_id_is_cfa(const u16 *id) static inline int ata_id_is_ssd(const u16 *id) { - return id[ATA_ID_ROT_SPEED] == 0x01; + int len; + const char *model; + + if (id[ATA_ID_ROT_SPEED] == 0x01) + return 1; + model = (const char *)&id[ATA_ID_PROD]; + len = strnlen(model, ATA_ID_PROD_LEN); + return len > 3 && !memcmp(model+len-3, "SSD", 3); } static inline int ata_drive_40wire(const u16 *dev_id) -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html