6.4-stable review patch. If anyone has any objections, please let me know.
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From: Guenter Roeck linux@roeck-us.net
[ 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@linaro.org Signed-off-by: Guenter Roeck linux@roeck-us.net Link: https://lore.kernel.org/r/20230720172021.2617326-1-linux@roeck-us.net Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/base/regmap/regcache-maple.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
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);