Takashi Iwai 1ea3e18e53 fbdev: Fix incorrect page mapping clearance at fb_deferred_io_release() ... commit fe9ae05cfb upstream. The recent fix for the deferred I/O by the commit 3efc61d952 ("fbdev: Fix invalid page access after closing deferred I/O devices") caused a regression when the same fb device is opened/closed while it's being used. It resulted in a frozen screen even if something is redrawn there after the close. The breakage is because the patch was made under a wrong assumption of a single open; in the current code, fb_deferred_io_release() cleans up the page mapping of the pageref list and it calls cancel_delayed_work_sync() unconditionally, where both are no correct behavior for multiple opens. This patch adds a refcount for the opens of the device, and applies the cleanup only when all files get closed. As both fb_deferred_io_open() and _close() are called always in the fb_info lock (mutex), it's safe to use the normal int for the refcounting. Also, a useless BUG_ON() is dropped. Fixes: 3efc61d952 ("fbdev: Fix invalid page access after closing deferred I/O devices") Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de> Reviewed-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20230308105012.1845-1-tiwai@suse.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-03-22 13:34:04 +01:00
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acpi	PCI/ACPI: Account for _S0W of the target bridge in acpi_pci_bridge_d3()	2023-03-11 13:55:33 +01:00
asm-generic	arch: fix broken BuildID for arm64 and riscv	2023-02-25 11:25:42 +01:00
clocksource	…
crypto	…
drm	drm/bridge: Fix returned array size name for atomic_get_input_bus_fmts kdoc	2023-03-22 13:33:47 +01:00
dt-bindings	…
keys	…
kunit	kunit: fix kunit_test_init_section_suites(...)	2023-02-09 11:28:08 +01:00
kvm	…
linux	fbdev: Fix incorrect page mapping clearance at fb_deferred_io_release()	2023-03-22 13:34:04 +01:00
math-emu	…
media	media: uvcvideo: Add GUID for BGRA/X 8:8:8:8	2023-03-11 13:55:35 +01:00
memory	memory: renesas-rpc-if: Split-off private data from struct rpcif	2023-03-11 13:55:17 +01:00
misc	…
net	netfilter: tproxy: fix deadlock due to missing BH disable	2023-03-17 08:50:25 +01:00
pcmcia	…
ras	…
rdma	…
rv	…
scsi	scsi: core: Add BLIST_NO_VPD_SIZE for some VDASD	2023-03-22 13:33:43 +01:00
soc	…
sound	ASoC: soc-dapm.h: fixup warning struct snd_pcm_substream not declared	2023-03-10 09:33:23 +01:00
target	…
trace	fd: dlm: trace send/recv of dlm message and rcom	2023-03-17 08:50:18 +01:00
uapi	usb: uvc: Enumerate valid values for color matching	2023-03-11 13:55:38 +01:00
ufs	scsi: ufs: exynos: Fix DMA alignment for PAGE_SIZE != 4096	2023-03-10 09:33:15 +01:00
vdso	…
video	…
xen	…