regmap: Merge up fixes

The main thing here is a fix for lockdep warnings with MMIO regmaps that
use a raw spinlock and a cache, some other lockdep fixes we'd done for
the benefit of the maple tree on sleeping buses meant that we were doing
allocations for those MMIO regmaps under a raw spinlock.  While fixing
that Michael Reeves also noticed that the debugfs files were briefly
available without the cache structures backing them.

There's also a fix for interrupt freeing on error in regmap-irq which
had been hanging around because it's not super urgent.

1 files changed, 7 insertions, 0 deletions

diff --git a/include/net/ip.h b/include/net/ip.h
index 6f602df72ee6..d07c2c573024 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -74,6 +74,13 @@ static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
 	return ip_hdr(skb)->ihl * 4;
 }
 
+static inline int ip_check_csum_start(const struct sk_buff *skb)
+{
+	if (unlikely(skb->csum_start < skb->network_header + ip_hdrlen(skb)))
+		return -EINVAL;
+	return 0;
+}
+
 struct ipcm_cookie {
 	struct sockcm_cookie	sockc;
 	__be32			addr;