Mark Rutland c2e90800ae virtio_mmio: fix devm cleanup ... Recent rework of the virtio_mmio probe/remove paths balanced a devm_ioremap() with an iounmap() rather than its devm variant. This ends up corrupting the devm datastructures, and results in the following boot-time splat on arm64 under QEMU 2.9.0: [ 3.450397] ------------[ cut here ]------------ [ 3.453822] Trying to vfree() nonexistent vm area (00000000c05b4844) [ 3.460534] WARNING: CPU: 1 PID: 1 at mm/vmalloc.c:1525 __vunmap+0x1b8/0x220 [ 3.475898] Kernel panic - not syncing: panic_on_warn set ... [ 3.475898] [ 3.493933] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.15.0-rc3 #1 [ 3.513109] Hardware name: linux,dummy-virt (DT) [ 3.525382] Call trace: [ 3.531683] dump_backtrace+0x0/0x368 [ 3.543921] show_stack+0x20/0x30 [ 3.547767] dump_stack+0x108/0x164 [ 3.559584] panic+0x25c/0x51c [ 3.569184] __warn+0x29c/0x31c [ 3.576023] report_bug+0x1d4/0x290 [ 3.586069] bug_handler.part.2+0x40/0x100 [ 3.597820] bug_handler+0x4c/0x88 [ 3.608400] brk_handler+0x11c/0x218 [ 3.613430] do_debug_exception+0xe8/0x318 [ 3.627370] el1_dbg+0x18/0x78 [ 3.634037] __vunmap+0x1b8/0x220 [ 3.648747] vunmap+0x6c/0xc0 [ 3.653864] __iounmap+0x44/0x58 [ 3.659771] devm_ioremap_release+0x34/0x68 [ 3.672983] release_nodes+0x404/0x880 [ 3.683543] devres_release_all+0x6c/0xe8 [ 3.695692] driver_probe_device+0x250/0x828 [ 3.706187] __driver_attach+0x190/0x210 [ 3.717645] bus_for_each_dev+0x14c/0x1f0 [ 3.728633] driver_attach+0x48/0x78 [ 3.740249] bus_add_driver+0x26c/0x5b8 [ 3.752248] driver_register+0x16c/0x398 [ 3.757211] __platform_driver_register+0xd8/0x128 [ 3.770860] virtio_mmio_init+0x1c/0x24 [ 3.782671] do_one_initcall+0xe0/0x398 [ 3.791890] kernel_init_freeable+0x594/0x660 [ 3.798514] kernel_init+0x18/0x190 [ 3.810220] ret_from_fork+0x10/0x18 To fix this, we can simply rip out the explicit cleanup that the devm infrastructure will do for us when our probe function returns an error code, or when our remove function returns. We only need to ensure that we call put_device() if a call to register_virtio_device() fails in the probe path. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Fixes: 7eb781b1bb ("virtio_mmio: add cleanup for virtio_mmio_probe") Fixes: 25f32223bc ("virtio_mmio: add cleanup for virtio_mmio_remove") Cc: Cornelia Huck <cohuck@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: weiping zhang <zhangweiping@didichuxing.com> Cc: virtualization@lists.linux-foundation.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com>		2017-12-14 21:01:40 +02:00
..
Kconfig
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
virtio_balloon.c	virtio_balloon: fix increment of vb->num_pfns in fill_balloon()	2017-12-01 16:55:45 +02:00
virtio_input.c
virtio_mmio.c	virtio_mmio: fix devm cleanup	2017-12-14 21:01:40 +02:00
virtio_pci_common.c
virtio_pci_common.h
virtio_pci_legacy.c
virtio_pci_modern.c
virtio_ring.c
virtio.c	virtio: release virtio index when fail to device_register	2017-12-01 16:55:32 +02:00