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mtd: Make sure the device supports erase operations in mtd_erase() 

Some devices do not implement ->_erase() or have an invalid ->erasesize
value. In this case, mtd_erase() should return -ENOTSUPP.

Note that the test is not done on the MTD_NO_ERASE flag because this
flag means 'erasing a block before writing to it is unnecessary',
not 'the erase operation is not supported'. Actually, some drivers are
setting the MTD_NO_ERASE flag but still implementing the ->_erase()
hook and setting a valid ->erasesize value.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Boris Brezillon 2018-01-22 10:38:01 +01:00 committed by Boris Brezillon
parent 7928b2cbe5
commit e6e620f0e1
1 changed files with 4 additions and 0 deletions
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4
drivers/mtd/mtdcore.c
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@ -971,10 +971,14 @@ EXPORT_SYMBOL_GPL(__put_mtd_device);
*/
int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
{
if (!mtd->erasesize || !mtd->_erase)
return -ENOTSUPP;
if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr)
return -EINVAL;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
if (!instr->len) {
instr->state = MTD_ERASE_DONE;