Messages in this thread Patch in this message | | | From | Stephen Boyd <> | Subject | [PATCH] regmap: Allocate buffers with GFP_ATOMIC when fast_io == true | Date | Thu, 10 Sep 2015 12:27:01 -0700 |
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If a regmap is using fast_io, allocate buffers in the write APIs with GFP_ATOMIC instead of GFP_KERNEL. Otherwise we may schedule while atomic.
Reported-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> --- drivers/base/regmap/internal.h | 1 + drivers/base/regmap/regmap.c | 16 +++++++++++----- 2 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index 873ddf91c9d3..3470ec146f12 100644 --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -59,6 +59,7 @@ struct regmap { regmap_lock lock; regmap_unlock unlock; void *lock_arg; /* This is passed to lock/unlock functions */ + gfp_t alloc_flags; struct device *dev; /* Device we do I/O on */ void *work_buf; /* Scratch buffer used to format I/O */ diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 29128c6af445..0ad22f4d40b1 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -563,6 +563,12 @@ struct regmap *regmap_init(struct device *dev, } map->lock_arg = map; } + + if ((bus && bus->fast_io) || config->fast_io) + map->alloc_flags = GFP_ATOMIC; + else + map->alloc_flags = GFP_KERNEL; + map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); map->format.pad_bytes = config->pad_bits / 8; map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); @@ -1296,7 +1302,7 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg, return -ENOMEM; async->work_buf = kzalloc(map->format.buf_size, - GFP_KERNEL | GFP_DMA); + map->alloc_flags | GFP_DMA); if (!async->work_buf) { kfree(async); return -ENOMEM; @@ -1358,7 +1364,7 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg, /* If that didn't work fall back on linearising by hand. */ if (ret == -ENOTSUPP) { len = map->format.reg_bytes + map->format.pad_bytes + val_len; - buf = kzalloc(len, GFP_KERNEL); + buf = kzalloc(len, map->alloc_flags); if (!buf) return -ENOMEM; @@ -1729,7 +1735,7 @@ out: if (!val_count) return -EINVAL; - wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); + wval = kmemdup(val, val_count * val_bytes, map->alloc_flags); if (!wval) { dev_err(map->dev, "Error in memory allocation\n"); return -ENOMEM; @@ -1771,7 +1777,7 @@ static int _regmap_raw_multi_reg_write(struct regmap *map, if (!len) return -EINVAL; - buf = kzalloc(len, GFP_KERNEL); + buf = kzalloc(len, map->alloc_flags); if (!buf) return -ENOMEM; @@ -1909,7 +1915,7 @@ static int _regmap_multi_reg_write(struct regmap *map, if (range) { size_t len = sizeof(struct reg_sequence)*num_regs; struct reg_sequence *base = kmemdup(regs, len, - GFP_KERNEL); + map->alloc_flags); if (!base) return -ENOMEM; ret = _regmap_range_multi_paged_reg_write(map, base, -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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