linux-kernel - Re: [SCSI] pmcraid: PMC-Sierra MaxRAID driver to support 6Gb/s SAS RAID controller

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Message-ID: <f512d8fa-e782-0679-8140-0a27dd3b9062@canonical.com>
Date:   Thu, 4 Oct 2018 09:28:19 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [SCSI] pmcraid: PMC-Sierra MaxRAID driver to support 6Gb/s SAS
 RAID controller

Hi,

Static analysis from CoverityScan (CID#114178 "Operands don't affect
result") detected an issue in drivers/scsi/pmcraid.c, function
pmcraid_init_res_table with the following check:

        if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
                pmcraid_err("IOA requires microcode download\n");


pinstance->cfg_table->flags is a u8, MICROCODE_UPDATE_REQUIRED is  1 <<
31, so the & operation always results in false and the error message is
never displayed.  From my understanding, flags should be a u8, so there
is something wrong here with the check.  Any ideas?

Colin