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authorVasant Hegde <hegdevasant@linux.vnet.ibm.com>2013-02-08 01:18:36 +0000
committerMichael Ellerman <michael@ellerman.id.au>2013-04-18 11:52:58 +1000
commitad18a364f186e085ea3194c1900d970d0cee8fad (patch)
tree4ce873d81d1e6f80405e102a0a7febf589b3e0f7
parentbb18b3a47d5998d0c94f12b8334e660a0d70b272 (diff)
powerpc/rtas_flash: Free kmem upon module exit
Memory allocated to rtas_firmware_flash_list in rtas_flash_write is not freed during module exit. We hit below call trace if we unload rtas_flash module after loading new firmware image and before rebooting the system. Call trace: ---------- Feb 6 08:42:10 eagle3 kernel: kmem_cache_destroy rtas_flash_cache: Slab cache still has objects Feb 6 08:42:10 eagle3 kernel: Call Trace: Feb 6 08:42:10 eagle3 kernel: [c00000001c303b40] [c000000000014940] .show_stack+0x70/0x1c0 (unreliable) Feb 6 08:42:10 eagle3 kernel: [c00000001c303bf0] [c000000000199bec] .kmem_cache_destroy+0x15c/0x170 Feb 6 08:42:10 eagle3 kernel: [c00000001c303c90] [d000000006fa1208] .rtas_flash_cleanup+0x3c/0x80 [rtas_flash] Feb 6 08:42:10 eagle3 kernel: [c00000001c303d20] [c0000000000f8970] .SyS_delete_module+0x1d0/0x2e0 Feb 6 08:42:10 eagle3 kernel: [c00000001c303e30] [c000000000009954] syscall_exit+0x0/0x94 This patch frees rtas_firmware_flash_list during module exit. Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
-rw-r--r--arch/powerpc/kernel/rtas_flash.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c
index c642f013298..a7020d2e368 100644
--- a/arch/powerpc/kernel/rtas_flash.c
+++ b/arch/powerpc/kernel/rtas_flash.c
@@ -790,6 +790,11 @@ static void __exit rtas_flash_cleanup(void)
{
rtas_flash_term_hook = NULL;
+ if (rtas_firmware_flash_list) {
+ free_flash_list(rtas_firmware_flash_list);
+ rtas_firmware_flash_list = NULL;
+ }
+
if (flash_block_cache)
kmem_cache_destroy(flash_block_cache);