linux-kernel - [PATCH 02/10] via-cuda: Remove redundant temporary variable

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Message-Id: <8154339c81046fb70b2b55fc65d8a1ad9d23f0d6.1480572271.git.fthain@telegraphics.com.au>
Date:   Thu,  1 Dec 2016 01:09:33 -0500 (EST)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-m68k@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 02/10] via-cuda: Remove redundant temporary variable

There is no possibility that current_req can change during execution of
cuda_start(). This can be confirmed by inspection: cuda_lock is always
held whenever cuda_start() is called or current_req is modified.

Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
---
 drivers/macintosh/via-cuda.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/macintosh/via-cuda.c b/drivers/macintosh/via-cuda.c
index 98ced65..4eb8a884 100644
--- a/drivers/macintosh/via-cuda.c
+++ b/drivers/macintosh/via-cuda.c
@@ -414,19 +414,15 @@ cuda_write(struct adb_request *req)
 static void
 cuda_start(void)
 {
-    struct adb_request *req;
-
     /* assert cuda_state == idle */
-    /* get the packet to send */
-    req = current_req;
-    if (req == 0)
+    if (current_req == NULL)
 	return;
     if ((in_8(&via[B]) & TREQ) == 0)
 	return;			/* a byte is coming in from the CUDA */
 
     /* set the shift register to shift out and send a byte */
     out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT);
-    out_8(&via[SR], req->data[0]);
+    out_8(&via[SR], current_req->data[0]);
     out_8(&via[B], in_8(&via[B]) & ~TIP);
     cuda_state = sent_first_byte;
 }
-- 
2.7.3