linux-kernel - [PATCH] cxl/mem: Fix a double shift bug

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Message-ID: <a11b0c78-4717-4f4e-90be-f47f300d607c@moroto.mountain>
Date:   Mon, 3 Jul 2023 17:17:45 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Vishal Verma <vishal.l.verma@...el.com>
Cc:     Alison Schofield <alison.schofield@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Dave Jiang <dave.jiang@...el.com>, linux-cxl@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] cxl/mem: Fix a double shift bug

The CXL_FW_CANCEL macro is used with set/test_bit() so it should be a
bit number and not the shifted value.  The original code is the
equivalent of using BIT(BIT(0)) so it's 0x2 instead of 0x1.  This has
no effect on runtime because it's done consistently and nothing else
was using the 0x2 bit.

Fixes: 9521875bbe00 ("cxl: add a firmware update mechanism using the sysfs firmware loader")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/cxl/cxlmem.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 79e99c873ca2..499113328586 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -323,7 +323,7 @@ struct cxl_mbox_activate_fw {
 
 /* FW state bits */
 #define CXL_FW_STATE_BITS		32
-#define CXL_FW_CANCEL		BIT(0)
+#define CXL_FW_CANCEL			0
 
 /**
  * struct cxl_fw_state - Firmware upload / activation state
-- 
2.39.2