forked from luck/tmp_suning_uos_patched
[JFFS2] Use point(), if available, to check newly erased blocks.
Faster and won't trash the D-cache. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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7eafaed55f
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fab2c39912
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@ -317,6 +317,33 @@ static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_erasebl
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size_t retlen;
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int ret = -EIO;
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if (c->mtd->point) {
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unsigned long *wordebuf;
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ret = c->mtd->point(c->mtd, jeb->offset, c->sector_size, &retlen, (unsigned char **)&ebuf);
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if (ret) {
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D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
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goto do_flash_read;
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}
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if (retlen < c->sector_size) {
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/* Don't muck about if it won't let us point to the whole erase sector */
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D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
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c->mtd->unpoint(c->mtd, ebuf, jeb->offset, c->sector_size);
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goto do_flash_read;
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}
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wordebuf = ebuf-sizeof(*wordebuf);
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retlen /= sizeof(*wordebuf);
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do {
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if (*++wordebuf != ~0)
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break;
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} while(--retlen);
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c->mtd->unpoint(c->mtd, ebuf, jeb->offset, c->sector_size);
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if (retlen)
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printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n",
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*wordebuf, jeb->offset + c->sector_size-retlen*sizeof(*wordebuf));
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return 0;
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}
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do_flash_read:
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ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!ebuf) {
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printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
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