From ad18a364f186e085ea3194c1900d970d0cee8fad Mon Sep 17 00:00:00 2001 From: Vasant Hegde Date: Fri, 8 Feb 2013 01:18:36 +0000 Subject: [PATCH] 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 Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/rtas_flash.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c index c642f0132988..a7020d2e368e 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); -- 2.34.1