This is a note to let you know that I've just added the patch titled
regmap: maple: Use alloc_flags for memory allocations
to the 6.4-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:
regmap-maple-use-alloc_flags-for-memory-allocations.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d908d538c8544452e4b3627669d7b63cd5918318
Author: Guenter Roeck <linux@xxxxxxxxxxxx>
Date: Thu Jul 20 10:20:21 2023 -0700
regmap: maple: Use alloc_flags for memory allocations
[ Upstream commit b0393e1fe40e962574613a5cdc4a470d6c1de023 ]
REGCACHE_MAPLE needs to allocate memory for regmap operations.
This results in lockdep splats if used with fast_io since fast_io uses
spinlocks for locking.
BUG: sleeping function called from invalid context at include/linux/sched/mm.h:306
in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 167, name: kunit_try_catch
preempt_count: 1, expected: 0
1 lock held by kunit_try_catch/167:
#0: 838e9c10 (regmap_kunit:86:(config)->lock){....}-{2:2}, at: regmap_lock_spinlock+0x14/0x1c
irq event stamp: 146
hardirqs last enabled at (145): [<8078bfa8>] crng_make_state+0x1a0/0x294
hardirqs last disabled at (146): [<80c5f62c>] _raw_spin_lock_irqsave+0x7c/0x80
softirqs last enabled at (0): [<80110cc4>] copy_process+0x810/0x216c
softirqs last disabled at (0): [<00000000>] 0x0
CPU: 0 PID: 167 Comm: kunit_try_catch Tainted: G N 6.5.0-rc1-00028-gc4be22597a36-dirty #6
Hardware name: Generic DT based system
unwind_backtrace from show_stack+0x18/0x1c
show_stack from dump_stack_lvl+0x38/0x5c
dump_stack_lvl from __might_resched+0x188/0x2d0
__might_resched from __kmem_cache_alloc_node+0x1f4/0x258
__kmem_cache_alloc_node from __kmalloc+0x48/0x170
__kmalloc from regcache_maple_write+0x194/0x248
regcache_maple_write from _regmap_write+0x88/0x140
_regmap_write from regmap_write+0x44/0x68
regmap_write from basic_read_write+0x8c/0x27c
basic_read_write from kunit_generic_run_threadfn_adapter+0x1c/0x28
kunit_generic_run_threadfn_adapter from kthread+0xf8/0x120
kthread from ret_from_fork+0x14/0x3c
Exception stack(0x881a5fb0 to 0x881a5ff8)
5fa0: 00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
Use map->alloc_flags instead of GFP_KERNEL for memory allocations to fix
the problem.
Fixes: f033c26de5a5 ("regmap: Add maple tree based register cache")
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230720172021.2617326-1-linux@xxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/base/regmap/regcache-maple.c b/drivers/base/regmap/regcache-maple.c
index 14f6f49af097c..08316d578be23 100644
--- a/drivers/base/regmap/regcache-maple.c
+++ b/drivers/base/regmap/regcache-maple.c
@@ -74,7 +74,7 @@ static int regcache_maple_write(struct regmap *map, unsigned int reg,
rcu_read_unlock();
entry = kmalloc((last - index + 1) * sizeof(unsigned long),
- GFP_KERNEL);
+ map->alloc_flags);
if (!entry)
return -ENOMEM;
@@ -92,7 +92,7 @@ static int regcache_maple_write(struct regmap *map, unsigned int reg,
mas_lock(&mas);
mas_set_range(&mas, index, last);
- ret = mas_store_gfp(&mas, entry, GFP_KERNEL);
+ ret = mas_store_gfp(&mas, entry, map->alloc_flags);
mas_unlock(&mas);
@@ -134,7 +134,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
lower = kmemdup(entry, ((min - mas.index) *
sizeof(unsigned long)),
- GFP_KERNEL);
+ map->alloc_flags);
if (!lower) {
ret = -ENOMEM;
goto out_unlocked;
@@ -148,7 +148,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
upper = kmemdup(&entry[max + 1],
((mas.last - max) *
sizeof(unsigned long)),
- GFP_KERNEL);
+ map->alloc_flags);
if (!upper) {
ret = -ENOMEM;
goto out_unlocked;
@@ -162,7 +162,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
/* Insert new nodes with the saved data */
if (lower) {
mas_set_range(&mas, lower_index, lower_last);
- ret = mas_store_gfp(&mas, lower, GFP_KERNEL);
+ ret = mas_store_gfp(&mas, lower, map->alloc_flags);
if (ret != 0)
goto out;
lower = NULL;
@@ -170,7 +170,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
if (upper) {
mas_set_range(&mas, upper_index, upper_last);
- ret = mas_store_gfp(&mas, upper, GFP_KERNEL);
+ ret = mas_store_gfp(&mas, upper, map->alloc_flags);
if (ret != 0)
goto out;
upper = NULL;
@@ -250,7 +250,7 @@ static int regcache_maple_insert_block(struct regmap *map, int first,
unsigned long *entry;
int i, ret;
- entry = kcalloc(last - first + 1, sizeof(unsigned long), GFP_KERNEL);
+ entry = kcalloc(last - first + 1, sizeof(unsigned long), map->alloc_flags);
if (!entry)
return -ENOMEM;
@@ -261,7 +261,7 @@ static int regcache_maple_insert_block(struct regmap *map, int first,
mas_set_range(&mas, map->reg_defaults[first].reg,
map->reg_defaults[last].reg);
- ret = mas_store_gfp(&mas, entry, GFP_KERNEL);
+ ret = mas_store_gfp(&mas, entry, map->alloc_flags);
mas_unlock(&mas);
