drivers/mtd/mtdconcat.c

369 	struct erase_info *erase;
372 	 * Check for proper erase block alignment of the to-be-erased area.
373 	 * It is easier to do this based on the super device's erase
378 		/* the easy case: device has uniform erase block size */
384 		/* device has variable erase size */
389 		 * Find the erase region where the to-be-erased area begins:
398 		 * offset is aligned to this region's erase size:
404 		 * now find the erase region where the to-be-erased area ends:
411 		 * check if the ending offset is aligned to this region's erase size
419 	erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL);
421 	if (!erase)
424 	*erase = *instr;
433 		if (subdev->size <= erase->addr) {
434 			erase->addr -= subdev->size;
444 	/* now do the erase: */
451 		if (erase->addr + length > subdev->size)
452 			erase->len = subdev->size - erase->addr;
454 			erase->len = length;
456 		length -= erase->len;
457 		if ((err = mtd_erase(subdev, erase))) {
461 			if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
462 				instr->fail_addr = erase->fail_addr + offset;
466 		 * erase->addr specifies the offset of the area to be
473 		erase->addr = 0;
476 	kfree(erase);
770 	 * Combine the erase block size info of the subdevices:
773 	 * many changes in erase size we have
779 			/* current subdevice has uniform erase size */
781 				/* if it differs from the last subdevice's erase size, count it */
788 			/* current subdevice has variable erase size */
792 				/* walk the list of erase regions, count any changes */
808 		 * All subdevices have the same uniform erase size.
817 		 * erase block size varies across the subdevices: allocate
818 		 * space to store the data describing the variable erase regions
832 			    ("memory allocation error while creating erase region list"
839 		 * erase region info:
845 				/* current subdevice has uniform erase size */
864 				/* current subdevice has variable erase size */
867 					/* walk the list of erase regions, count any changes */