"Matthew R. Ochs" <mro...@linux.vnet.ibm.com> writes:
> The AFU version is stored as a non-terminated string of bytes within
> a 64-bit little-endian register. Presently the value is read directly
> (no MMIO accessor) and is stored in a buffer that is not big enough
> to contain a NULL terminator. Additionally the version obtained is not
> evaluated against a known value to prevent usage with unsupported AFUs.
> All of these deficiencies can lead to a variety of problems.
>
> + if ((afu->interface_version + 1) == 0) {
> + pr_err("Back level AFU, please upgrade. AFU version %s "
> + "interface version 0x%llx\n", afu->version,
> + afu->interface_version);
> + rc = -EINVAL;
> + goto err1;
I'm confused by this if statement. If afu->interface_version + 1 == 0,
and interface_version is a 64bit unsigned int, that would mean that
afu->interface_version was 0xFFFF FFFF FFFF FFFF.
Are you trying to check against all Fs? Is that value significant in the
hardware?
Regards,
Daniel
> + } else
> + pr_debug("%s: afu version %s, interface version 0x%llX\n",
> + __func__, afu->version, afu->interface_version);
>
> rc = start_afu(cfg);
> if (rc) {
> diff --git a/drivers/scsi/cxlflash/sislite.h b/drivers/scsi/cxlflash/sislite.h
> index 63bf394..8425d1a 100644
> --- a/drivers/scsi/cxlflash/sislite.h
> +++ b/drivers/scsi/cxlflash/sislite.h
> @@ -340,7 +340,7 @@ struct sisl_global_regs {
> #define SISL_AFUCONF_MBOX_CLR_READ 0x0010ULL
> __be64 afu_config;
> __be64 rsvd[0xf8];
> - __be64 afu_version;
> + __le64 afu_version;
> __be64 interface_version;
> };
>
> --
> 2.1.0
>
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