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TencentOS-kernel/drivers
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Jiri Kosina c4a04ef3af block/floppy: fix contended case in floppy_queue_rq() 
commit 263c61581a38d0a5ad1f5f4a9143b27d68caeffd upstream.

Since the switch of floppy driver to blk-mq, the contended (fdc_busy) case
in floppy_queue_rq() is not handled correctly.

In case we reach floppy_queue_rq() with fdc_busy set (i.e. with the floppy
locked due to another request still being in-flight), we put the request
on the list of requests and return BLK_STS_OK to the block core, without
actually scheduling delayed work / doing further processing of the
request. This means that processing of this request is postponed until
another request comes and passess uncontended.

Which in some cases might actually never happen and we keep waiting
indefinitely. The simple testcase is

	for i in `seq 1 2000`; do echo -en $i '\r'; blkid --info /dev/fd0 2> /dev/null; done

run in quemu. That reliably causes blkid eventually indefinitely hanging
in __floppy_read_block_0() waiting for completion, as the BIO callback
never happens, and no further IO is ever submitted on the (non-existent)
floppy device. This was observed reliably on qemu-emulated device.

Fix that by not queuing the request in the contended case, and return
BLK_STS_RESOURCE instead, so that blk core handles the request
rescheduling and let it pass properly non-contended later.

Fixes: a9f38e1dec107a ("floppy: convert to blk-mq")
Cc: stable@vger.kernel.org
Tested-by: Libor Pechacek <lpechacek@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-03-16 16:29:13 +08:00
..
accessibility Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
acpi ACPI: PM: Avoid using power resources if there are none for D0 2021-03-16 16:29:03 +08:00
amba Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
android Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ata libata: Return correct status in sata_pmp_eh_recover_pm() when ATA_DFLAG_DETACH is set 2021-03-16 16:26:16 +08:00
atm Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
auxdisplay Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
base x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation 2021-03-16 16:28:53 +08:00
bcma Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
block block/floppy: fix contended case in floppy_queue_rq() 2021-03-16 16:29:13 +08:00
bluetooth Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
bus bus: sunxi-rsb: Return correct data when mixing 16-bit and 8-bit reads 2021-03-16 16:25:52 +08:00
cdrom Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
char agp/intel: Reinforce the barrier after GTT updates 2021-03-16 16:29:12 +08:00
clk PM: runtime: clk: Fix clk_pm_runtime_get() error path 2021-03-16 16:29:05 +08:00
clocksource Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
connector Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
counter counter: 104-quad-8: Add lock guards - generic interface 2021-03-16 16:27:07 +08:00
cpufreq cpufreq: Fix up cpufreq_boost_set_sw() 2021-03-16 16:29:08 +08:00
cpuidle Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
crypto crypto: virtio: Fix dest length calculation in __virtio_crypto_skcipher_do_req() 2021-03-16 16:29:07 +08:00
dax device-dax: don't leak kernel memory to user space after unloading kmem 2021-03-16 16:28:19 +08:00
dca Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
devfreq PM / devfreq: Add missing locking while setting suspend_freq 2021-03-16 16:27:31 +08:00
dio Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
dma dmaengine: owl: Use correct lock in owl_dma_get_pchan() 2021-03-16 16:28:16 +08:00
dma-buf dma-buf: Fix SET_NAME ioctl uapi 2021-03-16 16:27:16 +08:00
edac EDAC/skx: Use the mcmtr register to retrieve close_pg/bank_xor_enable 2021-03-16 16:29:08 +08:00
eisa Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
extcon Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
firewire Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
firmware firmware: imx: scu: Fix corruption of header 2021-03-16 16:29:06 +08:00
fpga fpga: dfl: pci: fix return value of cci_pci_sriov_configure 2021-03-16 16:27:02 +08:00
fsi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
gnss Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
gpio gpio: fix locking open drain IRQ lines 2021-03-16 16:28:37 +08:00
gpu drm/vkms: Hold gem object while still in-use 2021-03-16 16:29:11 +08:00
greybus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
hid HID: i2c-hid: add Schneider SCL142ALM to descriptor override 2021-03-16 16:28:43 +08:00
hsi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
hv Drivers: hv: vmbus: Fix Suspend-to-Idle for Generation-2 VM 2021-03-16 16:27:20 +08:00
hwmon hwmon: (nct7904) Fix incorrect range of temperature limit registers 2021-03-16 16:28:30 +08:00
hwspinlock Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
hwtracing Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
i2c i2c: altera: Fix race between xfer_msg and isr thread 2021-03-16 16:28:47 +08:00
i3c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ide Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
idle Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
iio iio: adc: stm32-adc: fix a wrong error message when probing interrupts 2021-03-16 16:28:51 +08:00
infiniband RDMA/uverbs: Make the event_queue fds return POLLERR when disassociated 2021-03-16 16:28:57 +08:00
input Input: synaptics - add a second working PNP_ID for Lenovo T470s 2021-03-16 16:28:56 +08:00
interconnect Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
iommu iommu: Fix reference count leak in iommu_group_alloc. 2021-03-16 16:28:37 +08:00
ipack ipack: tpci200: fix error return code in tpci200_register() 2021-03-16 16:28:19 +08:00
irqchip irqchip/mbigen: Free msi_desc on device teardown 2021-03-16 16:26:29 +08:00
isdn Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
leds leds: core: Fix warning message when init_data 2021-03-16 16:26:37 +08:00
lightnvm Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
macintosh Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mailbox Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mcb Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
md dm multipath: use updated MPATHF_QUEUE_IO on mapping for bio-based mpath 2021-03-16 16:27:21 +08:00
media media: fdp1: Fix R-Car M3-N naming in debug message 2021-03-16 16:28:17 +08:00
memory Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
memstick Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
message Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mfd mfd: intel-lpss: Use devm_ioremap_uc for MMIO 2021-03-16 16:27:29 +08:00
misc mei: release me_cl object reference 2021-03-16 16:28:19 +08:00
mmc mmc: sdio: Fix several potential memory leaks in mmc_sdio_init_card() 2021-03-16 16:29:13 +08:00
mtd mtd: Fix mtd not registered due to nvmem name collision 2021-03-16 16:28:08 +08:00
mux Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
net ath9k: Fix general protection fault in ath9k_hif_usb_rx_cb 2021-03-16 16:29:11 +08:00
nfc NFC: st21nfca: add missed kfree_skb() in an error path 2021-03-16 16:28:49 +08:00
ntb Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
nubus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
nvdimm libnvdimm: Out of bounds read in __nd_ioctl() 2021-03-16 16:26:40 +08:00
nvme nvme: fix possible hang when ns scanning fails during error recovery 2021-03-16 16:27:31 +08:00
nvmem nvmem: qfprom: remove incorrect write support 2021-03-16 16:28:52 +08:00
of of: overlay: kmemleak in dup_and_fixup_symbol_prop() 2021-03-16 16:26:30 +08:00
opp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
oprofile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
parisc Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
parport Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pci PCI/PM: Adjust pcie_wait_for_link_delay() for caller delay 2021-03-16 16:28:57 +08:00
pcmcia Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
perf Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
phy phy: uniphier-usb3ss: Add Pro5 support 2021-03-16 16:26:34 +08:00
pinctrl pinctrl: cherryview: Add missing spinlock usage in chv_gpio_irq_handler 2021-03-16 16:27:52 +08:00
platform platform/x86: asus-nb-wmi: Do not load on Asus T100TA and T200TA 2021-03-16 16:28:12 +08:00
pnp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
power power: supply: axp288_fuel_gauge: Broaden vendor check for Intel Compute Sticks. 2021-03-16 16:26:40 +08:00
powercap Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pps Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ps3 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ptp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pwm pwm: bcm2835: Dynamically allocate base 2021-03-16 16:26:47 +08:00
rapidio rapidio: fix an error in get_user_pages_fast() error handling 2021-03-16 16:28:19 +08:00
ras Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
regulator Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
remoteproc remoteproc: Fix and restore the parenting hierarchy for vdev 2021-03-16 16:29:08 +08:00
reset Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
rpmsg Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
rtc rtc: 88pm860x: fix possible race condition 2021-03-16 16:26:33 +08:00
s390 s390/ism: fix error return code in ism_probe() 2021-03-16 16:27:57 +08:00
sbus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
scsi scsi: lpfc: Fix negation of else clause in lpfc_prep_node_fc4type 2021-03-16 16:29:10 +08:00
sfi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sh Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
siox Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
slimbus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
soc soc: mediatek: cmdq: return send msg error code 2021-03-16 16:28:33 +08:00
soundwire Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
spi spi: bcm-qspi: when tx/rx buffer is NULL set to 0 2021-03-16 16:29:05 +08:00
spmi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ssb Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
staging staging: rtl8712: Fix IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 2021-03-16 16:28:52 +08:00
target scsi: target: Put lun_ref at end of tmr processing 2021-03-16 16:28:15 +08:00
tc Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tee Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
thermal Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
thunderbolt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tty tty: hvc_console, fix crashes on parallel open/close 2021-03-16 16:28:52 +08:00
uio Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
usb CDC-ACM: heed quirk also in error handling 2021-03-16 16:28:52 +08:00
vfio vfio/type1: Fix VA->PA translation for PFNMAP VMAs in vaddr_get_pfn() 2021-03-16 16:27:23 +08:00
vhost vhost/vsock: fix packet delivery order to monitoring devices 2021-03-16 16:28:09 +08:00
video video: fbdev: w100fb: Fix a potential double free. 2021-03-16 16:29:09 +08:00
virt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virtio Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
visorbus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vlynq Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vme Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
w1 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
watchdog watchdog: imx_sc_wdt: Fix reboot on crash 2021-03-16 16:29:01 +08:00
xen xen/xenbus: ensure xenbus_map_ring_valloc() returns proper grant status 2021-03-16 16:27:14 +08:00
zorro Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00