linux-kernel - [PATCH] platform/x86: drop unneeded assignment in host_control

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Message-Id: <1619523119-112342-1-git-send-email-yang.lee@linux.alibaba.com>
Date:   Tue, 27 Apr 2021 19:31:59 +0800
From:   Yang Li <yang.lee@...ux.alibaba.com>
To:     stuart.w.hayes@...il.com
Cc:     hdegoede@...hat.com, mgross@...ux.intel.com,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yang Li <yang.lee@...ux.alibaba.com>
Subject: [PATCH] platform/x86: drop unneeded assignment in host_control_smi()

Making '==' operation with ESM_STATUS_CMD_UNSUCCESSFUL directly
after calling the function inb() is more efficient, so assignment
to 'cmd_status' is redundant.

Eliminate the following clang_analyzer warning:
drivers/platform/x86/dell/dcdbas.c:397:11: warning: Although the value
stored to 'cmd_status' is used in the enclosing expression, the value is
never actually read from 'cmd_status'

No functional change.

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
---
 drivers/platform/x86/dell/dcdbas.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell/dcdbas.c b/drivers/platform/x86/dell/dcdbas.c
index d513a59..a9e8a88 100644
--- a/drivers/platform/x86/dell/dcdbas.c
+++ b/drivers/platform/x86/dell/dcdbas.c
@@ -394,7 +394,7 @@ static int host_control_smi(void)
 
 		/* wait a few to see if it executed */
 		num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
-		while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
+		while (inb(PCAT_APM_STATUS_PORT)
 		       == ESM_STATUS_CMD_UNSUCCESSFUL) {
 			num_ticks--;
 			if (num_ticks == EXPIRED_TIMER)
-- 
1.8.3.1