linux-kernel - [PATCH 4.9 010/101] staging: rts5208: fix gcc-8 logic error warning

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Message-Id: <20181206143012.168547454@linuxfoundation.org>
Date:   Thu,  6 Dec 2018 15:38:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 4.9 010/101] staging: rts5208: fix gcc-8 logic error warning

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit 58930cced012adb01bc78b3687049b17ef44d0a3 upstream.

As gcc-8 points out, the bit mask check makes no sense here:

drivers/staging/rts5208/sd.c: In function 'ext_sd_send_cmd_get_rsp':
drivers/staging/rts5208/sd.c:4130:25: error: bitwise comparison always evaluates to true [-Werror=tautological-compare]

However, the code is even more bogus, as we have already
checked for the SD_RSP_TYPE_R0 case earlier in the function
and returned success. As seen in the mmc/sd driver core,
SD_RSP_TYPE_R0 means "no response" anyway, so checking for
a particular response would not help either.

This just removes the nonsensical code to get rid of the
warning.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/rts5208/sd.c |    6 ------
 1 file changed, 6 deletions(-)

--- a/drivers/staging/rts5208/sd.c
+++ b/drivers/staging/rts5208/sd.c
@@ -4110,12 +4110,6 @@ RTY_SEND_CMD:
 					rtsx_trace(chip);
 					return STATUS_FAIL;
 				}
-
-			} else if (rsp_type == SD_RSP_TYPE_R0) {
-				if ((ptr[3] & 0x1E) != 0x03) {
-					rtsx_trace(chip);
-					return STATUS_FAIL;
-				}
 			}
 		}
 	}