From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jim Wylder <jwylder@google.com>, Sasha Levin <sashal@kernel.org>,
broonie@kernel.org, gregkh@linuxfoundation.org
Subject: [PATCH AUTOSEL 6.3 01/19] regmap: Account for register length when chunking
Date: Thu, 15 Jun 2023 07:37:01 -0400 [thread overview]
Message-ID: <20230615113719.648862-1-sashal@kernel.org> (raw)
From: Jim Wylder <jwylder@google.com>
[ Upstream commit 3981514180c987a79ea98f0ae06a7cbf58a9ac0f ]
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: Sasha Levin <sashal@kernel.org>
---
drivers/base/regmap/regmap.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index d2a54eb0efd9b..f9f38ab3f030e 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2064,6 +2064,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
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)
@@ -2071,8 +2073,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
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;
--
2.39.2
next reply other threads:[~2023-06-15 11:37 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-15 11:37 Sasha Levin [this message]
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 02/19] iommu/amd: Handle GALog overflows Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 03/19] scsi: target: iscsi: Fix hang in the iSCSI login code Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 04/19] scsi: target: iscsi: Remove unused transport_timer Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 05/19] scsi: target: iscsi: Prevent login threads from racing between each other Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 06/19] HID: google: add jewel USB id Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 07/19] HID: wacom: Add error check to wacom_parse_and_register() Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 08/19] arm64: Add missing Set/Way CMO encodings Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 09/19] smb3: missing null check in SMB2_change_notify Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 10/19] media: cec: core: disable adapter in cec_devnode_unregister Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 11/19] media: cec: core: don't set last_initiator if tx in progress Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 12/19] nfcsim.c: Fix error checking for debugfs_create_dir Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 13/19] btrfs: fix an uninitialized variable warning in btrfs_log_inode Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 14/19] usb: gadget: udc: fix NULL dereference in remove() Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 15/19] nvme: fix miss command type check Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 16/19] nvme: double KA polling frequency to avoid KATO with TBKAS on Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 17/19] nvme: check IO start time when deciding to defer KA Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 18/19] ext4: enable the lazy init thread when remounting read/write Sasha Levin
2023-06-15 11:37 ` [PATCH AUTOSEL 6.3 19/19] nvme: improve handling of long keep alives Sasha Levin
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