This is a note to let you know that I've just added the patch titled
mtd: rawnand: brcmnand: Fix crash during the panic_write
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mtd-rawnand-brcmnand-fix-crash-during-the-panic_write.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e66dd317194daae0475fe9e5577c80aa97f16cb9 Mon Sep 17 00:00:00 2001
From: William Zhang <william.zhang@xxxxxxxxxxxx>
Date: Thu, 6 Jul 2023 11:29:07 -0700
Subject: mtd: rawnand: brcmnand: Fix crash during the panic_write
From: William Zhang <william.zhang@xxxxxxxxxxxx>
commit e66dd317194daae0475fe9e5577c80aa97f16cb9 upstream.
When executing a NAND command within the panic write path, wait for any
pending command instead of calling BUG_ON to avoid crashing while
already crashing.
Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller")
Signed-off-by: William Zhang <william.zhang@xxxxxxxxxxxx>
Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Reviewed-by: Kursad Oney <kursad.oney@xxxxxxxxxxxx>
Reviewed-by: Kamal Dasu <kamal.dasu@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20230706182909.79151-4-william.zhang@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/nand/raw/brcmnand/brcmnand.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -1592,7 +1592,17 @@ static void brcmnand_send_cmd(struct brc
dev_dbg(ctrl->dev, "send native cmd %d addr 0x%llx\n", cmd, cmd_addr);
- BUG_ON(ctrl->cmd_pending != 0);
+ /*
+ * If we came here through _panic_write and there is a pending
+ * command, try to wait for it. If it times out, rather than
+ * hitting BUG_ON, just return so we don't crash while crashing.
+ */
+ if (oops_in_progress) {
+ if (ctrl->cmd_pending &&
+ bcmnand_ctrl_poll_status(ctrl, NAND_CTRL_RDY, NAND_CTRL_RDY, 0))
+ return;
+ } else
+ BUG_ON(ctrl->cmd_pending != 0);
ctrl->cmd_pending = cmd;
ret = bcmnand_ctrl_poll_status(ctrl, NAND_CTRL_RDY, NAND_CTRL_RDY, 0);
Patches currently in stable-queue which might be from william.zhang@xxxxxxxxxxxx are
queue-6.5/mtd-rawnand-brcmnand-fix-potential-out-of-bounds-access-in-oob-write.patch
queue-6.5/mtd-rawnand-brcmnand-fix-crash-during-the-panic_write.patch
queue-6.5/mtd-rawnand-brcmnand-fix-potential-false-time-out-warning.patch
queue-6.5/mtd-rawnand-brcmnand-fix-ecc-level-field-setting-for-v7.2-controller.patch
