4.19-stable patches

added patches:
	regmap-account-for-register-length-when-chunking.patch

diff --git a/queue-4.19/regmap-account-for-register-length-when-chunking.patch b/queue-4.19/regmap-account-for-register-length-when-chunking.patch
new file mode 100644 (file)
index 0000000..7a18ab0
--- /dev/null
+++ b/queue-4.19/regmap-account-for-register-length-when-chunking.patch
@@ -0,0 +1,46 @@
+From 3981514180c987a79ea98f0ae06a7cbf58a9ac0f Mon Sep 17 00:00:00 2001
+From: Jim Wylder <jwylder@google.com>
+Date: Wed, 17 May 2023 10:20:11 -0500
+Subject: regmap: Account for register length when chunking
+
+From: Jim Wylder <jwylder@google.com>
+
+commit 3981514180c987a79ea98f0ae06a7cbf58a9ac0f upstream.
+
+Currently, when regmap_raw_write() splits the data, it uses the
+max_raw_write value defined for the bus.  For any bus that includes
+the target register address in the max_raw_write value, the chunked
+transmission will always exceed the maximum transmission length.
+To avoid this problem, subtract the length of the register and the
+padding from the maximum transmission.
+
+Signed-off-by: Jim Wylder <jwylder@google.com
+Link: https://lore.kernel.org/r/20230517152444.3690870-2-jwylder@google.com
+Signed-off-by: Mark Brown <broonie@kernel.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/base/regmap/regmap.c |    6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+--- a/drivers/base/regmap/regmap.c
++++ b/drivers/base/regmap/regmap.c
+@@ -1825,6 +1825,8 @@ int _regmap_raw_write(struct regmap *map
+       size_t val_count = val_len / val_bytes;
+       size_t chunk_count, chunk_bytes;
+       size_t chunk_regs = val_count;
++      size_t max_data = map->max_raw_write - map->format.reg_bytes -
++                      map->format.pad_bytes;
+       int ret, i;
+ 
+       if (!val_count)
+@@ -1832,8 +1834,8 @@ int _regmap_raw_write(struct regmap *map
+ 
+       if (map->use_single_write)
+               chunk_regs = 1;
+-      else if (map->max_raw_write && val_len > map->max_raw_write)
+-              chunk_regs = map->max_raw_write / val_bytes;
++      else if (map->max_raw_write && val_len > max_data)
++              chunk_regs = max_data / val_bytes;
+ 
+       chunk_count = val_count / chunk_regs;
+       chunk_bytes = chunk_regs * val_bytes;

diff --git a/queue-4.19/series b/queue-4.19/series
index bd14beb660c4fc84e9527ac21c87657ea3f76d90..2b5e803104220924cda51adaa7bdf0228bde959e 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -82,3 +82,4 @@ tty-serial-fsl_lpuart-use-uartctrl_txinv-to-send-break-instead-of-uartctrl_sbk.p
 selinux-don-t-use-make-s-grouped-targets-feature-yet.patch
 ext4-add-lockdep-annotations-for-i_data_sem-for-ea_inode-s.patch
 fbcon-fix-null-ptr-deref-in-soft_cursor.patch
+regmap-account-for-register-length-when-chunking.patch