kernel/lantiq: Create kernel files for v6.1 (from v5.15)

[openwrt/openwrt.git] / target / linux / lantiq / patches-5.15 / 0400-mtd-rawnand-xway-don-t-yield-while-holding-spinlock.patch

diff --git a/target/linux/lantiq/patches-5.15/0400-mtd-rawnand-xway-don-t-yield-while-holding-spinlock.patch b/target/linux/lantiq/patches-5.15/0400-mtd-rawnand-xway-don-t-yield-while-holding-spinlock.patch
deleted file mode 100644 (file)
index edf0626..0000000
--- a/target/linux/lantiq/patches-5.15/0400-mtd-rawnand-xway-don-t-yield-while-holding-spinlock.patch
+++ /dev/null
@@ -1,38 +0,0 @@
-From 416f25a948d11ef15733f2e31658d31b5cc7bef6 Mon Sep 17 00:00:00 2001
-From: Thomas Nixon <tom@tomn.co.uk>
-Date: Sun, 26 Mar 2023 11:08:49 +0100
-Subject: [PATCH] mtd: rawnand: xway: don't yield while holding spinlock
-
-The nand driver normally while waiting for the device to become ready;
-this is normally fine, but xway_nand holds the ebu_lock spinlock, and
-this can cause lockups if other threads which use ebu_lock are
-interleaved. Fix this by waiting instead of polling.
-
-This mainly showed up as crashes in ath9k_pci_owl_loader (see
-https://github.com/openwrt/openwrt/issues/9829 ), but turning on
-spinlock debugging shows this happening in other places too.
-
-This doesn't seem to measurably impact boot time.
-
-Signed-off-by: Thomas Nixon <tom@tomn.co.uk>
----
- drivers/mtd/nand/raw/xway_nand.c | 8 +++++++-
- 1 file changed, 7 insertions(+), 1 deletion(-)
-
---- a/drivers/mtd/nand/raw/xway_nand.c
-+++ b/drivers/mtd/nand/raw/xway_nand.c
-@@ -175,7 +175,13 @@ static void xway_cmd_ctrl(struct nand_ch
- 
- static int xway_dev_ready(struct nand_chip *chip)
- {
--      return ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_RD;
-+      /*
-+       * wait until ready, as otherwise the driver will yield in nand_wait or
-+       * nand_wait_ready, which is a bad idea when we're holding ebu_lock
-+       */
-+      while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_RD) == 0)
-+              cpu_relax();
-+      return 1;
- }
- 
- static unsigned char xway_read_byte(struct nand_chip *chip)