mtd: nand: Prevent possible kernel lockup in nand_command()

If a NAND device is not really present or pin muxes are not correctly
configured we can lock up the kernel waiting infinitely for NAND_STATUS
to be ready.

This can be easily reproduced on TI's DRA7-evm board by booting it
without NAND support in u-boot and disabling NAND pin muxes in the kernel.

Add timeout when waiting for NAND_CMD_RESET completion. As per ONFi v4.0
tRST can be upto 250ms for EZ-NAND and 5ms for raw NAND.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index ff56522..c2e1232 100644 (file)
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -566,6 +566,25 @@ void nand_wait_ready(struct mtd_info *mtd)
 EXPORT_SYMBOL_GPL(nand_wait_ready);
 
 /**
+ * nand_wait_status_ready - [GENERIC] Wait for the ready status after commands.
+ * @mtd: MTD device structure
+ * @timeo: Timeout in ms
+ *
+ * Wait for status ready (i.e. command done) or timeout.
+ */
+static void nand_wait_status_ready(struct mtd_info *mtd, unsigned long timeo)
+{
+       register struct nand_chip *chip = mtd->priv;
+
+       timeo = jiffies + msecs_to_jiffies(timeo);
+       do {
+               if ((chip->read_byte(mtd) & NAND_STATUS_READY))
+                       break;
+               touch_softlockup_watchdog();
+       } while (time_before(jiffies, timeo));
+};
+
+/**
  * nand_command - [DEFAULT] Send command to NAND device
  * @mtd: MTD device structure
  * @command: the command to be sent
@@ -643,8 +662,8 @@ static void nand_command(struct mtd_info *mtd, unsigned int command,
                               NAND_CTRL_CLE | NAND_CTRL_CHANGE);
                chip->cmd_ctrl(mtd,
                               NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
-               while (!(chip->read_byte(mtd) & NAND_STATUS_READY))
-                               ;
+               /* EZ-NAND can take upto 250ms as per ONFi v4.0 */
+               nand_wait_status_ready(mtd, 250);
                return;
 
                /* This applies to read commands */
@@ -740,8 +759,8 @@ static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
                               NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
                chip->cmd_ctrl(mtd, NAND_CMD_NONE,
                               NAND_NCE | NAND_CTRL_CHANGE);
-               while (!(chip->read_byte(mtd) & NAND_STATUS_READY))
-                               ;
+               /* EZ-NAND can take upto 250ms as per ONFi v4.0 */
+               nand_wait_status_ready(mtd, 250);
                return;
 
        case NAND_CMD_RNDOUT: