diff options
Diffstat (limited to 'drivers/gpu/host1x/syncpt.c')
| -rw-r--r-- | drivers/gpu/host1x/syncpt.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c index 807c74fc6a0a..2c111710f3bf 100644 --- a/drivers/gpu/host1x/syncpt.c +++ b/drivers/gpu/host1x/syncpt.c @@ -8,6 +8,7 @@ #include <linux/module.h> #include <linux/device.h> #include <linux/dma-fence.h> +#include <linux/overflow.h> #include <linux/slab.h> #include <trace/events/host1x.h> @@ -126,6 +127,10 @@ EXPORT_SYMBOL(host1x_syncpt_id); */ u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs) { + /* + * Syncpoint values are intended to be modulo 2^32, so overflow + * here is intended. + */ return (u32)atomic_add_return(incrs, &sp->max_val); } EXPORT_SYMBOL(host1x_syncpt_incr_max); @@ -279,7 +284,7 @@ bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh) current_val = (u32)atomic_read(&sp->min_val); - return ((current_val - thresh) & 0x80000000U) == 0U; + return (wrapping_sub(u32, current_val, thresh) & 0x80000000U) == 0U; } int host1x_syncpt_init(struct host1x *host) |