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Diffstat (limited to 'fs/eventfd.c')
-rw-r--r--fs/eventfd.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/eventfd.c b/fs/eventfd.c
index 4b0a226024fa..8d0c0df01854 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -118,18 +118,18 @@ static unsigned int eventfd_poll(struct file *file, poll_table *wait)
{
struct eventfd_ctx *ctx = file->private_data;
unsigned int events = 0;
- unsigned long flags;
+ u64 count;
poll_wait(file, &ctx->wqh, wait);
+ smp_rmb();
+ count = ctx->count;
- spin_lock_irqsave(&ctx->wqh.lock, flags);
- if (ctx->count > 0)
+ if (count > 0)
events |= POLLIN;
- if (ctx->count == ULLONG_MAX)
+ if (count == ULLONG_MAX)
events |= POLLERR;
- if (ULLONG_MAX - 1 > ctx->count)
+ if (ULLONG_MAX - 1 > count)
events |= POLLOUT;
- spin_unlock_irqrestore(&ctx->wqh.lock, flags);
return events;
}