[2/4] exfat: Simplify exfat_utf8_d_cmp() for code points above U+FFFF
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Message ID 20200317222555.29974-3-pali@kernel.org
State In Next
Commit 9709a3374b76bcf794141928ef16acaa6a49f6d6
Headers show
Series
  • Fixes for exfat driver
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Commit Message

Pali Rohár March 17, 2020, 10:25 p.m. UTC
If two Unicode code points represented in UTF-16 are different then also
their UTF-32 representation must be different. Therefore conversion from
UTF-32 to UTF-16 is not needed.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
 fs/exfat/namei.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

Patch
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diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index e0ec4ff366f5..f07cab5fcd28 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -179,14 +179,9 @@  static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
 		if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
 			if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
 				return 1;
-		} else if (u_a > 0xFFFF && u_b > 0xFFFF) {
-			if (exfat_low_surrogate(u_a) !=
-					exfat_low_surrogate(u_b) ||
-			    exfat_high_surrogate(u_a) !=
-					exfat_high_surrogate(u_b))
-				return 1;
 		} else {
-			return 1;
+			if (u_a != u_b)
+				return 1;
 		}
 	}