xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

irqdomain/treewide: Free firmware node after domain removal

Browse Source 
Commit 711419e504 ("irqdomain: Add the missing assignment of
domain->fwnode for named fwnode") unintentionally caused a dangling pointer
page fault issue on firmware nodes that were freed after IRQ domain
allocation. Commit e3beca48a4 fixed that dangling pointer issue by only
freeing the firmware node after an IRQ domain allocation failure. That fix
no longer frees the firmware node immediately, but leaves the firmware node
allocated after the domain is removed.

The firmware node must be kept around through irq_domain_remove, but should be
freed it afterwards.

Add the missing free operations after domain removal where where appropriate.

Fixes: e3beca48a4 ("irqdomain/treewide: Keep firmware node unconditionally allocated")
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>	# drivers/pci
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1595363169-7157-1-git-send-email-jonathan.derrick@intel.com
This commit is contained in:
Jon Derrick
2020-07-21 14:26:09 -06:00
committed by Thomas Gleixner
parent ba47d845d7
commit ec0160891e
5 changed files with 25 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/x86/kernel/apic/io_apic.c
View File

@@ -2335,8 +2335,13 @@ static int mp_irqdomain_create(int ioapic)
static void ioapic_destroy_irqdomain(int idx)
{
struct ioapic_domain_cfg *cfg = &ioapics[idx].irqdomain_cfg;
struct fwnode_handle *fn = ioapics[idx].irqdomain->fwnode;
if (ioapics[idx].irqdomain) {
irq_domain_remove(ioapics[idx].irqdomain);
if (!cfg->dev)
irq_domain_free_fwnode(fn);
ioapics[idx].irqdomain = NULL;
}
}