diff options
| author | adam radford <aradford@gmail.com> | 2012-01-11 03:07:56 +0100 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-01-16 09:28:03 +0100 |
| commit | 124dd90f6525ee785b47b59aebadd4a35f797dc1 (patch) | |
| tree | de46f5d335a05c198567ae3d7b2a9a212fd04006 /drivers/scsi | |
| parent | [SCSI] sg: convert to kstrtoul_from_user() (diff) | |
| download | linux-124dd90f6525ee785b47b59aebadd4a35f797dc1.tar.xz linux-124dd90f6525ee785b47b59aebadd4a35f797dc1.zip | |
[SCSI] megaraid: fix sparse warnings
There's a zero day mistake in the megaraid driver in that the code that
obtains the version number does a >> 8 on a char quantity. This >>8 causes a
sparse warning because it always produces zero. Al Viro suggested these
shifts should be >> 4 thus treating the firmware version as a BCD quantity.
However, in the interests of safety we've elected to replace the >> 8
quantities with an explicit zero, thus quieting the sparse warning while
preserving the same (albeit incorrect) version number as had previously been
seen.
Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/megaraid.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c index 5c1776406c96..15eefa1d61fd 100644 --- a/drivers/scsi/megaraid.c +++ b/drivers/scsi/megaraid.c @@ -306,19 +306,22 @@ mega_query_adapter(adapter_t *adapter) adapter->host->sg_tablesize = adapter->sglen; - /* use HP firmware and bios version encoding */ + /* use HP firmware and bios version encoding + Note: fw_version[0|1] and bios_version[0|1] were originally shifted + right 8 bits making them zero. This 0 value was hardcoded to fix + sparse warnings. */ if (adapter->product_info.subsysvid == HP_SUBSYS_VID) { sprintf (adapter->fw_version, "%c%d%d.%d%d", adapter->product_info.fw_version[2], - adapter->product_info.fw_version[1] >> 8, + 0, adapter->product_info.fw_version[1] & 0x0f, - adapter->product_info.fw_version[0] >> 8, + 0, adapter->product_info.fw_version[0] & 0x0f); sprintf (adapter->bios_version, "%c%d%d.%d%d", adapter->product_info.bios_version[2], - adapter->product_info.bios_version[1] >> 8, + 0, adapter->product_info.bios_version[1] & 0x0f, - adapter->product_info.bios_version[0] >> 8, + 0, adapter->product_info.bios_version[0] & 0x0f); } else { memcpy(adapter->fw_version, |