From: Subhash Jadavani <subhashj@codeaurora.org> To: vinholikatti@gmail.com, jejb@linux.vnet.ibm.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, Subhash Jadavani <subhashj@codeaurora.org>, linux-kernel@vger.kernel.org (open list) Subject: [PATCH v1 1/1] scsi: ufs-qcom: remove redundant condition check Date: Fri, 17 Feb 2017 13:53:41 -0800 [thread overview] Message-ID: <1487368421-22903-1-git-send-email-subhashj@codeaurora.org> (raw) Dan Carpenter <dan.carpenter@oracle.com> reported this: --- The patch 9c46b8676271: "scsi: ufs-qcom: dump additional testbus registers" from Feb 3, 2017, leads to the following static checker warning: drivers/scsi/ufs/ufs-qcom.c:1531 ufs_qcom_testbus_cfg_is_ok() warn: impossible condition '(host->testbus.select_minor > 255) => (0-255 > 255)' drivers/scsi/ufs/ufs-qcom.c 1517 static bool ufs_qcom_testbus_cfg_is_ok(struct ufs_qcom_host *host) 1518 { 1519 if (host->testbus.select_major >= TSTBUS_MAX) { 1520 dev_err(host->hba->dev, 1521 "%s: UFS_CFG1[TEST_BUS_SEL} may not equal 0x%05X\n", 1522 __func__, host->testbus.select_major); 1523 return false; 1524 } 1525 1526 /* 1527 * Not performing check for each individual select_major 1528 * mappings of select_minor, since there is no harm in 1529 * configuring a non-existent select_minor 1530 */ 1531 if (host->testbus.select_minor > 0xFF) { ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ It might make sense to keep this check. I don't know. But it's confusing that 0xFF is a magic number. Better to make it a define. 1532 dev_err(host->hba->dev, 1533 "%s: 0x%05X is not a legal testbus option\n", 1534 __func__, host->testbus.select_minor); 1535 return false; 1536 } 1537 1538 return true; 1539 } --- As data type of "select_minor" is u8, above check is redundant. This change removes it. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> --- drivers/scsi/ufs/ufs-qcom.c | 12 ------------ 1 file changed, 12 deletions(-) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index ce5d023..c87d770 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1523,18 +1523,6 @@ static bool ufs_qcom_testbus_cfg_is_ok(struct ufs_qcom_host *host) return false; } - /* - * Not performing check for each individual select_major - * mappings of select_minor, since there is no harm in - * configuring a non-existent select_minor - */ - if (host->testbus.select_minor > 0xFF) { - dev_err(host->hba->dev, - "%s: 0x%05X is not a legal testbus option\n", - __func__, host->testbus.select_minor); - return false; - } - return true; } -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
WARNING: multiple messages have this Message-ID (diff)
From: Subhash Jadavani <subhashj@codeaurora.org> To: vinholikatti@gmail.com, jejb@linux.vnet.ibm.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, Subhash Jadavani <subhashj@codeaurora.org>, open list <linux-kernel@vger.kernel.org> Subject: [PATCH v1 1/1] scsi: ufs-qcom: remove redundant condition check Date: Fri, 17 Feb 2017 13:53:41 -0800 [thread overview] Message-ID: <1487368421-22903-1-git-send-email-subhashj@codeaurora.org> (raw) Dan Carpenter <dan.carpenter@oracle.com> reported this: --- The patch 9c46b8676271: "scsi: ufs-qcom: dump additional testbus registers" from Feb 3, 2017, leads to the following static checker warning: drivers/scsi/ufs/ufs-qcom.c:1531 ufs_qcom_testbus_cfg_is_ok() warn: impossible condition '(host->testbus.select_minor > 255) => (0-255 > 255)' drivers/scsi/ufs/ufs-qcom.c 1517 static bool ufs_qcom_testbus_cfg_is_ok(struct ufs_qcom_host *host) 1518 { 1519 if (host->testbus.select_major >= TSTBUS_MAX) { 1520 dev_err(host->hba->dev, 1521 "%s: UFS_CFG1[TEST_BUS_SEL} may not equal 0x%05X\n", 1522 __func__, host->testbus.select_major); 1523 return false; 1524 } 1525 1526 /* 1527 * Not performing check for each individual select_major 1528 * mappings of select_minor, since there is no harm in 1529 * configuring a non-existent select_minor 1530 */ 1531 if (host->testbus.select_minor > 0xFF) { ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ It might make sense to keep this check. I don't know. But it's confusing that 0xFF is a magic number. Better to make it a define. 1532 dev_err(host->hba->dev, 1533 "%s: 0x%05X is not a legal testbus option\n", 1534 __func__, host->testbus.select_minor); 1535 return false; 1536 } 1537 1538 return true; 1539 } --- As data type of "select_minor" is u8, above check is redundant. This change removes it. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> --- drivers/scsi/ufs/ufs-qcom.c | 12 ------------ 1 file changed, 12 deletions(-) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index ce5d023..c87d770 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1523,18 +1523,6 @@ static bool ufs_qcom_testbus_cfg_is_ok(struct ufs_qcom_host *host) return false; } - /* - * Not performing check for each individual select_major - * mappings of select_minor, since there is no harm in - * configuring a non-existent select_minor - */ - if (host->testbus.select_minor > 0xFF) { - dev_err(host->hba->dev, - "%s: 0x%05X is not a legal testbus option\n", - __func__, host->testbus.select_minor); - return false; - } - return true; } -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
next reply other threads:[~2017-02-17 22:04 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-02-17 21:53 Subhash Jadavani [this message] 2017-02-17 21:53 ` [PATCH v1 1/1] scsi: ufs-qcom: remove redundant condition check Subhash Jadavani 2017-02-21 3:06 ` Martin K. Petersen 2017-02-21 3:06 ` Martin K. Petersen 2017-02-22 23:24 ` Subhash Jadavani
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