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

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commit 9cc0a598b9 upstream.

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: 9d2ee0a60b ("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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
William Zhang
2023-07-06 11:29:06 -07:00
committed by Greg Kroah-Hartman
parent 2353b7bb61
commit 3b51d016bb
1 changed files with 8 additions and 0 deletions
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8
drivers/mtd/nand/raw/brcmnand/brcmnand.c
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@@ -1043,6 +1043,14 @@ 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);