linux-kernel - [PATCH 3/9] MIPS: VPE: Exit vpe_release() early if vpe

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Date:	Sun, 12 Jul 2015 18:11:12 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Andrew Bresticker <abrestic@...omium.org>,
	linux-mips@...ux-mips.org, James Hogan <james.hogan@...tec.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/9] MIPS: VPE: Exit vpe_release() early if vpe_run() isn't
 defined

vpe_run() is a weak symbol.  If there's no definition of it, its value is
zero.

If vpe_run is zero, return failure early.  We're going to fail anyway, so
there's no point in getting a VPE and attempting to load it.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 arch/mips/kernel/vpe.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 11da314..72cae9f 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -821,13 +821,18 @@ static int vpe_release(struct inode *inode, struct file *filp)
 	Elf_Ehdr *hdr;
 	int ret = 0;
 
+	if (!vpe_run) {
+		pr_warn("VPE loader: ELF load failed.\n");
+		return -ENOEXEC;
+	}
+
 	v = get_vpe(aprp_cpu_index());
 	if (v == NULL)
 		return -ENODEV;
 
 	hdr = (Elf_Ehdr *) v->pbuffer;
 	if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
-		if ((vpe_elfload(v) >= 0) && vpe_run) {
+		if (vpe_elfload(v) >= 0) {
 			vpe_run(v);
 		} else {
 			pr_warn("VPE loader: ELF load failed.\n");

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