linux-kernel - [PATCH -next] ocxl: Fix missing unlock on error in afu_ioctl_enable_p9

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Date:   Tue, 5 Jun 2018 09:16:21 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Frederic Barrat <fbarrat@...ux.vnet.ibm.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Alastair D'Silva <alastair@...ilva.org>
CC:     Wei Yongjun <weiyongjun1@...wei.com>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next] ocxl: Fix missing unlock on error in afu_ioctl_enable_p9_wait()

Add the missing unlock before return from function
afu_ioctl_enable_p9_wait() in the error handling case.

Fixes: e948e06fc63a ("ocxl: Expose the thread_id needed for wait on POWER9")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 drivers/misc/ocxl/file.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
index 33ae46c..e6a6074 100644
--- a/drivers/misc/ocxl/file.c
+++ b/drivers/misc/ocxl/file.c
@@ -139,8 +139,10 @@ static long afu_ioctl_enable_p9_wait(struct ocxl_context *ctx,
 		// Locks both status & tidr
 		mutex_lock(&ctx->status_mutex);
 		if (!ctx->tidr) {
-			if (set_thread_tidr(current))
+			if (set_thread_tidr(current)) {
+				mutex_unlock(&ctx->status_mutex);
 				return -ENOENT;
+			}
 
 			ctx->tidr = current->thread.tidr;
 		}