[MTD] OneNAND: release CPU in cycles

This patch teaches OneNAND to release processor in
read/write/erase cycles and let other processes proceed.
Also, remove buggi touch watchdog call which only hides
the problem instead of solving it.

Signed-off-by: Artem Bityutskiy <[e-mail]>
Signed-off-by: Kyungmin Park <[e-mail]>

drivers/mtd/onenand/onenand_base.c

···
 
 		if (state != FL_READING)
 			cond_resched();
-		touch_softlockup_watchdog();
 	}
 	/* To get correct interrupt status in timeout case */
 	interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
···
 {
 	struct onenand_chip *this = mtd->priv;
 
-	/* To prevent soft lockup */
-	touch_softlockup_watchdog();
-
 	wait_for_completion(&this->complete);
 
 	return onenand_wait(mtd, state);
···
 
 	/* We use interrupt wait first */
 	this->wait = onenand_interrupt_wait;
-
-	/* To prevent soft lockup */
-	touch_softlockup_watchdog();
 
 	timeout = msecs_to_jiffies(100);
 	remain = wait_for_completion_timeout(&this->complete, timeout);
···
 
 	stats = mtd->ecc_stats;
 	while (read < len) {
+		cond_resched();
+
 		thislen = min_t(int, mtd->writesize, len - read);
 
 		column = from & (mtd->writesize - 1);
···
 	column = from & (mtd->oobsize - 1);
 
 	while (read < len) {
+		cond_resched();
+
 		thislen = mtd->oobsize - column;
 		thislen = min_t(int, thislen, len);
 
···
 		int thislen = min_t(int, bytes, len - written);
 		u_char *wbuf = (u_char *) buf;
 
+		cond_resched();
+
 		this->command(mtd, ONENAND_CMD_BUFFERRAM, to, bytes);
 
 		/* Partial page write */
···
 	/* Loop until all data write */
 	while (written < len) {
 		int thislen = min_t(int, mtd->oobsize, len - written);
+
+		cond_resched();
 
 		column = to & (mtd->oobsize - 1);
 
···
 	instr->state = MTD_ERASING;
 
 	while (len) {
+		cond_resched();
 
 		/* Check if we have a bad block, we do not erase bad blocks */
 		if (onenand_block_checkbad(mtd, addr, 0, 0)) {