On 11/24/2014 02:40 PM, Christoph Hellwig wrote:
> Can someone review this trivial patch for me? Thanks!
>
The compiler complains because when asd_find_flash_de fails, the offs is not
initialized.
When that happens this code is invoked :
if (err) {
ASD_DPRINTK("couldn't find CTRL-A user settings section\n");
ASD_DPRINTK("Creating default CTRL-A user settings section\n");
dflt_ps.id0 = 'h';
dflt_ps.num_phys = 8;
for (i =0; i < ASD_MAX_PHYS; i++) {
memcpy(dflt_ps.phy_ent[i].sas_addr,
asd_ha->hw_prof.sas_addr, SAS_ADDR_SIZE);
dflt_ps.phy_ent[i].sas_link_rates = 0x98;
dflt_ps.phy_ent[i].flags = 0x0;
dflt_ps.phy_ent[i].sata_link_rates = 0x0;
}
size = sizeof(struct asd_ctrla_phy_settings);
ps = &dflt_ps;
the dflt_ps is initialized and the address assigned to 'ps', but none of them
is used later
}
if (size == 0)
goto out;
err = -ENOMEM;
el = kmalloc(size, GFP_KERNEL);
if (!el) {
ASD_DPRINTK("no mem for ctrla user settings section\n");
goto out;
}
err = asd_read_flash_seg(asd_ha, (void *)el, offs, size);
if (err) {
ASD_DPRINTK("couldn't read ctrla phy settings section\n");
goto out2;
}
err = -ENOENT;
ps = asd_find_ll_by_id(el, 'h', 0xFF);
here^ a new value is assigned to 'ps'
I have no idea what was intended in the originally so - it looks likely, but
how do we know that
the '0' is a correct value for offs?
Probably the error path is never used, this patch should fix the gcc warning
too -
@@ -990,20 +990,7 @@ static int asd_process_ctrl_a_user(struct asd_ha_struct
*asd_ha,
err = asd_find_flash_de(flash_dir, FLASH_DE_CTRL_A_USER, &offs, &size);
if (err) {
ASD_DPRINTK("couldn't find CTRL-A user settings section\n");
- ASD_DPRINTK("Creating default CTRL-A user settings section\n");
-
- dflt_ps.id0 = 'h';
- dflt_ps.num_phys = 8;
- for (i =0; i < ASD_MAX_PHYS; i++) {
- memcpy(dflt_ps.phy_ent[i].sas_addr,
- asd_ha->hw_prof.sas_addr, SAS_ADDR_SIZE);
- dflt_ps.phy_ent[i].sas_link_rates = 0x98;
- dflt_ps.phy_ent[i].flags = 0x0;
- dflt_ps.phy_ent[i].sata_link_rates = 0x0;
- }
-
- size = sizeof(struct asd_ctrla_phy_settings);
- ps = &dflt_ps;
+ goto out;
}
if (size == 0)
................
Somebody with access to this hw might help and test "offs = 0;".
It's a question whether we should touch old drivers at all.
Tomas
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