[+cc Lukas, author of the TODO you refer to]
On Wed, Aug 18, 2021 at 11:57:51AM -0500, Vishal Aslot wrote:
> ebda_rsrc_controller() calls iounmap(io_mem) on the error path. It's
> caller, ibmphp_access_ebda() also calls iounmap(io_mem) on good and
> error paths. Removing the iounmap(io_mem) invocation inside
> ebda_rsrc_controller().
>
> Signed-off-by: Vishal Aslot <os.vaslot@xxxxxxxxx>
Applied to pci/hotplug for v5.15, thanks!
I also removed the item from the TODO list, so the patch looks like
this:
commit faa2e05ad0dc ("PCI: ibmphp: Fix double unmap of io_mem")
Author: Vishal Aslot <os.vaslot@xxxxxxxxx>
Date: Wed Aug 18 11:57:51 2021 -0500
PCI: ibmphp: Fix double unmap of io_mem
ebda_rsrc_controller() calls iounmap(io_mem) on the error path. Its caller,
ibmphp_access_ebda(), also calls iounmap(io_mem) on good and error paths.
Remove the iounmap(io_mem) invocation from ebda_rsrc_controller().
[bhelgaas: remove item from TODO]
Link: https://lore.kernel.org/r/20210818165751.591185-1-os.vaslot@xxxxxxxxx
Signed-off-by: Vishal Aslot <os.vaslot@xxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
diff --git a/drivers/pci/hotplug/TODO b/drivers/pci/hotplug/TODO
index a32070be5adf..cc6194aa24c1 100644
--- a/drivers/pci/hotplug/TODO
+++ b/drivers/pci/hotplug/TODO
@@ -40,9 +40,6 @@ ibmphp:
* The return value of pci_hp_register() is not checked.
-* iounmap(io_mem) is called in the error path of ebda_rsrc_controller()
- and once more in the error path of its caller ibmphp_access_ebda().
-
* The various slot data structures are difficult to follow and need to be
simplified. A lot of functions are too large and too complex, they need
to be broken up into smaller, manageable pieces. Negative examples are
diff --git a/drivers/pci/hotplug/ibmphp_ebda.c b/drivers/pci/hotplug/ibmphp_ebda.c
index 11a2661dc062..7fb75401ad8a 100644
--- a/drivers/pci/hotplug/ibmphp_ebda.c
+++ b/drivers/pci/hotplug/ibmphp_ebda.c
@@ -714,8 +714,7 @@ static int __init ebda_rsrc_controller(void)
/* init hpc structure */
hpc_ptr = alloc_ebda_hpc(slot_num, bus_num);
if (!hpc_ptr) {
- rc = -ENOMEM;
- goto error_no_hpc;
+ return -ENOMEM;
}
hpc_ptr->ctlr_id = ctlr_id;
hpc_ptr->ctlr_relative_id = ctlr;
@@ -910,8 +909,6 @@ static int __init ebda_rsrc_controller(void)
kfree(tmp_slot);
error_no_slot:
free_ebda_hpc(hpc_ptr);
-error_no_hpc:
- iounmap(io_mem);
return rc;
}
> ---
>
> Why am I fixing this?
> I found this clean up item in drivers/pci/hotplug/TODO [lines 43-44]
> and decided to fix it. This is my 2nd patch ever in linux so my
> apologies for any style issues. I am very teachable. :)
>
> drivers/pci/hotplug/ibmphp_ebda.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/pci/hotplug/ibmphp_ebda.c b/drivers/pci/hotplug/ibmphp_ebda.c
> index 11a2661dc062..7fb75401ad8a 100644
> --- a/drivers/pci/hotplug/ibmphp_ebda.c
> +++ b/drivers/pci/hotplug/ibmphp_ebda.c
> @@ -714,8 +714,7 @@ static int __init ebda_rsrc_controller(void)
> /* init hpc structure */
> hpc_ptr = alloc_ebda_hpc(slot_num, bus_num);
> if (!hpc_ptr) {
> - rc = -ENOMEM;
> - goto error_no_hpc;
> + return -ENOMEM;
> }
> hpc_ptr->ctlr_id = ctlr_id;
> hpc_ptr->ctlr_relative_id = ctlr;
> @@ -910,8 +909,6 @@ static int __init ebda_rsrc_controller(void)
> kfree(tmp_slot);
> error_no_slot:
> free_ebda_hpc(hpc_ptr);
> -error_no_hpc:
> - iounmap(io_mem);
> return rc;
> }
>
> --
> 2.27.0
>
