mtd: rawnand: brcmnand: Fix potential false time out warning

If system is busy during the command status polling function, the driver
may not get the chance to poll the status register till the end of time
out and return the premature status.  Do a final check after time out
happens to ensure reading the correct status.

Fixes: 9d2ee0a60b8b ("mtd: nand: brcmnand: Check flash #WP pin status before nand erase/program")
Signed-off-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: stable@vger.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230706182909.79151-3-william.zhang@broadcom.com

diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
index 9ea96911d16b9bcbfa18a33b05fbdff4997182fb..9a373a10304d81e3d89d6d9f6a660039be9c9fd2 100644 (file)
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -1080,6 +1080,14 @@ static int bcmnand_ctrl_poll_status(struct brcmnand_controller *ctrl,
                cpu_relax();
        } while (time_after(limit, jiffies));
 
+       /*
+        * do a final check after time out in case the CPU was busy and the driver
+        * did not get enough time to perform the polling to avoid false alarms
+        */
+       val = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS);
+       if ((val & mask) == expected_val)
+               return 0;
+
        dev_warn(ctrl->dev, "timeout on status poll (expected %x got %x)\n",
                 expected_val, val & mask);