[PATCH] arm64: ptrace: user_regset_copyin_ignore() always returns 0

[Sergey Shtylyov]

user_regset_copyin_ignore() always return 0, so checking its result seems
pointless -- don't do this...

Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.

Signed-off-by: Sergey Shtylyov <s.shtylyov at omp.ru>

---
This patch is against the 'for-next/core' branch of the ARM64 repo...

 arch/arm64/kernel/ptrace.c |   16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

Index: linux/arch/arm64/kernel/ptrace.c
===================================================================
--- linux.orig/arch/arm64/kernel/ptrace.c
+++ linux/arch/arm64/kernel/ptrace.c
@@ -514,9 +514,7 @@ static int hw_break_set(struct task_stru
 
 	/* Resource info and pad */
 	offset = offsetof(struct user_hwdebug_state, dbg_regs);
-	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
-	if (ret)
-		return ret;
+	user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
 
 	/* (address, ctrl) registers */
 	limit = regset->n * regset->size;
@@ -543,11 +541,8 @@ static int hw_break_set(struct task_stru
 			return ret;
 		offset += PTRACE_HBP_CTRL_SZ;
 
-		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
-						offset,
-						offset + PTRACE_HBP_PAD_SZ);
-		if (ret)
-			return ret;
+		user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+					  offset, offset + PTRACE_HBP_PAD_SZ);
 		offset += PTRACE_HBP_PAD_SZ;
 		idx++;
 	}
@@ -939,10 +934,7 @@ static int sve_set_common(struct task_st
 
 	start = end;
 	end = SVE_PT_SVE_FPSR_OFFSET(vq);
-	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
-					start, end);
-	if (ret)
-		goto out;
+	user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, start, end);
 
 	/*
 	 * Copy fpsr, and fpcr which must follow contiguously in