Ben Collins wrote:
..
static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
{
- u64 sectors = 0;
+ u64 sectors;
+ u32 high, low;
- sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
- sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
- sectors |= (tf->hob_lbal & 0xff) << 24;
- sectors |= (tf->lbah & 0xff) << 16;
- sectors |= (tf->lbam & 0xff) << 8;
- sectors |= (tf->lbal & 0xff);
+ high = (tf->hob_lbah << 16) |
+ (tf->hob_lbam << 8) |
+ tf->hob_lbal;
+ low = (tf->lbah << 16) |
+ (tf->lbam << 8) |
+ tf->lbal;
- return ++sectors;
+ sectors = ((u64)high << 24) | low;
+
+ return sectors + 1;
}
Ben, I very much prefer the fixed version of this function
as implemented by the patch above.
But.. is the original code actually broken, or just messy?
Cheers
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