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SubjectRe: [PATCH v3] qla2xxx: silence two GCC warnings

Acked-by: Saurav Kashyap <saurav.kashyap@qlogic.com>

Thanks,
~Saurav

>Compiling qla_gs.o (part of the qla2xxx module) triggers two GCC
>warnings:
> drivers/scsi/qla2xxx/qla_gs.c: In function Œqla2x00_fdmi_rhba¹:
> drivers/scsi/qla2xxx/qla_gs.c:1339:7: warning: array subscript is
>above array bounds [-Warray-bounds]
> drivers/scsi/qla2xxx/qla_gs.c: In function Œqla2x00_fdmi_register¹:
> drivers/scsi/qla2xxx/qla_gs.c:1663:15: warning: array subscript is
>above array bounds [-Warray-bounds]
>
>It seems that the sequence of a strcpy followed by a strlen confuses GCC
>when it is keeping track of array bounds here. (It is not clear to me
>which array triggers this warning and by how much GCC thinks the
>subscript is above its bounds. Neither is it clear to me why comparable
>code in these two functions doesn't trigger this warning.)
>
>An easy way to silence these warnings is to use preprocessor macros and
>strncpy, as that apparently gives GCC enough information to keep track
>of array bounds.
>
>Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
>---
>0) Updated for Saurav's request to use strncpy().
>
>1) Still only compile tested.
>
> drivers/scsi/qla2xxx/qla_def.h | 1 +
> drivers/scsi/qla2xxx/qla_gs.c | 8 ++++----
> 2 files changed, 5 insertions(+), 4 deletions(-)
>
>diff --git a/drivers/scsi/qla2xxx/qla_def.h
>b/drivers/scsi/qla2xxx/qla_def.h
>index 39007f5..8895038 100644
>--- a/drivers/scsi/qla2xxx/qla_def.h
>+++ b/drivers/scsi/qla2xxx/qla_def.h
>@@ -37,6 +37,7 @@
> #include "qla_nx.h"
> #define QLA2XXX_DRIVER_NAME "qla2xxx"
> #define QLA2XXX_APIDEV "ql2xapidev"
>+#define QLA2XXX_MANUFACTURER "QLogic Corporation"
>
> /*
> * We have MAILBOX_REGISTER_COUNT sized arrays in a few places,
>diff --git a/drivers/scsi/qla2xxx/qla_gs.c b/drivers/scsi/qla2xxx/qla_gs.c
>index 05260d2..824cbcf 100644
>--- a/drivers/scsi/qla2xxx/qla_gs.c
>+++ b/drivers/scsi/qla2xxx/qla_gs.c
>@@ -1325,8 +1325,8 @@ qla2x00_fdmi_rhba(scsi_qla_host_t *vha)
> /* Manufacturer. */
> eiter = (struct ct_fdmi_hba_attr *) (entries + size);
> eiter->type = __constant_cpu_to_be16(FDMI_HBA_MANUFACTURER);
>- strcpy(eiter->a.manufacturer, "QLogic Corporation");
>- alen = strlen(eiter->a.manufacturer);
>+ alen = strlen(QLA2XXX_MANUFACTURER);
>+ strncpy(eiter->a.manufacturer, QLA2XXX_MANUFACTURER, alen + 1);
> alen += (alen & 3) ? (4 - (alen & 3)) : 4;
> eiter->len = cpu_to_be16(4 + alen);
> size += 4 + alen;
>@@ -1646,8 +1646,8 @@ qla2x00_fdmi_rpa(scsi_qla_host_t *vha)
> /* OS device name. */
> eiter = (struct ct_fdmi_port_attr *) (entries + size);
> eiter->type = __constant_cpu_to_be16(FDMI_PORT_OS_DEVICE_NAME);
>- strcpy(eiter->a.os_dev_name, QLA2XXX_DRIVER_NAME);
>- alen = strlen(eiter->a.os_dev_name);
>+ alen = strlen(QLA2XXX_DRIVER_NAME);
>+ strncpy(eiter->a.os_dev_name, QLA2XXX_DRIVER_NAME, alen + 1);
> alen += (alen & 3) ? (4 - (alen & 3)) : 4;
> eiter->len = cpu_to_be16(4 + alen);
> size += 4 + alen;
>--
>1.7.11.4
>
>


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