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Benjamin Gaignard 6662edcd32 media: videobuf2: Add min_reqbufs_allocation field to vb2_queue structure 
Add 'min_reqbufs_allocation' field in the vb2_queue structure so drivers
can specify the minimum number of buffers to allocate when calling
VIDIOC_REQBUFS.
When initializing the queue, v4l2 core makes sure that the following
constraints are respected:
- the minimum number of buffers to allocate must be at least 2 because
one buffer is used by the hardware while the other is being processed
by userspace.
-if the driver needs 'min_queued_buffers' in the queue before calling
start_streaming(), then the minimum requirement is 'min_queued_buffers + 1'
to keep at least one buffer available for userspace.

Simplify __vb2_init_fileio() by using 'min_reqbufs_allocation' directly
to avoid duplicating the minimum number of buffers to allocate computation.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
 		2024-03-25 12:00:44 +01:00
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accel
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accessibility Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
acpi RISC-V Patches for the 6.9 Merge Window 2024-03-22 10:41:13 -07:00
amba
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android Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
ata
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atm
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auxdisplay
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base Driver core changes for 6.9-rc1 2024-03-21 13:34:15 -07:00
bcma
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block block-6.9-20240322 2024-03-22 12:46:07 -07:00
bluetooth TTY/Serial driver update for 6.9-rc1 2024-03-21 12:44:10 -07:00
bus Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
cache
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cdrom
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cdx
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char Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
clk
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clocksource A set of updates for clocksource and clockevent drivers: 2024-03-23 14:42:45 -07:00
comedi Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
connector
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counter
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cpufreq RISC-V Patches for the 6.9 Merge Window 2024-03-22 10:41:13 -07:00
cpuidle RISC-V Patches for the 6.9 Merge Window 2024-03-22 10:41:13 -07:00
crypto
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cxl
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dax
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dca
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devfreq
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dio
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dma
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dma-buf
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dpll
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edac
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eisa
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extcon
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firewire firewire: core: add memo about the caller of show functions for device attributes 2024-03-21 21:20:18 +09:00
firmware EFI fixes for v6.9 #2 2024-03-24 13:54:06 -07:00
fpga Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
fsi
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gnss
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gpio
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gpu drm fixes for 6.9-rc1 2024-03-21 19:04:31 -07:00
greybus Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
hid
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hsi
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hte
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hv hyperv-next for v6.9 2024-03-21 10:01:02 -07:00
hwmon
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hwspinlock
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hwtracing
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i2c
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i3c
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idle
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iio Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
infiniband
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input TTY/Serial driver update for 6.9-rc1 2024-03-21 12:44:10 -07:00
interconnect
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iommu dma-mapping fixes for Linux 6.9 2024-03-24 10:45:31 -07:00
ipack
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irqchip
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isdn
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leds
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macintosh
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mailbox
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mcb
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md - Fix a memory leak in DM integrity recheck code that was added during 2024-03-22 12:34:26 -07:00
media media: videobuf2: Add min_reqbufs_allocation field to vb2_queue structure 2024-03-25 12:00:44 +01:00
memory Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
memstick
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message
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mfd TTY/Serial driver update for 6.9-rc1 2024-03-21 12:44:10 -07:00
misc hardening fixes for v6.9-rc1 2024-03-23 08:43:21 -07:00
mmc
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most
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mtd This pull request contains updates for UBI and UBIFS: 2024-03-21 15:09:29 -07:00
mux
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net hardening fixes for v6.9-rc1 2024-03-23 08:43:21 -07:00
nfc
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ntb
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nubus
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nvdimm
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nvme nvme updates for Linux 6.9 2024-03-21 13:23:07 -06:00
nvmem
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of Driver core changes for 6.9-rc1 2024-03-21 13:34:15 -07:00
opp
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parisc
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parport
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pci
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pcmcia
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peci
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perf RISC-V Patches for the 6.9 Merge Window 2024-03-22 10:41:13 -07:00
phy USB/Thunderbolt changes for 6.9-rc1 2024-03-21 12:35:20 -07:00
pinctrl
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platform Char/Misc and other driver subsystem updates for 6.9-rc1 2024-03-21 13:21:31 -07:00
pmdomain
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pnp
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power
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powercap
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pps
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ps3
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ptp
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pwm
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rapidio
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ras
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regulator regulator: Fix for v6.9 2024-03-22 09:52:37 -07:00
remoteproc remoteproc updates for v6.9 2024-03-21 10:37:39 -07:00
reset
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rpmsg
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rtc RTC for 6.9 2024-03-21 17:16:46 -07:00
s390
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sbus
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scsi SCSI misc on 20240322 2024-03-22 13:31:07 -07:00
sh
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siox SIOX changes for 6.9-rc1 2024-03-21 15:18:18 -07:00
slimbus
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soc Including fixes from CAN, netfilter, wireguard and IPsec. 2024-03-21 14:50:39 -07:00
soundwire
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spi spi: Fixes for v6.9 2024-03-22 09:57:00 -07:00
spmi
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ssb
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staging Staging driver cleanups for 6.9-rc1 2024-03-21 13:03:44 -07:00
target
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tc
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tee
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thermal
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thunderbolt USB/Thunderbolt changes for 6.9-rc1 2024-03-21 12:35:20 -07:00
tty TTY/Serial driver update for 6.9-rc1 2024-03-21 12:44:10 -07:00
ufs
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uio
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usb USB/Thunderbolt changes for 6.9-rc1 2024-03-21 12:35:20 -07:00
vdpa
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vfio
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vhost
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video fbdev fixes and cleanups for 6.9-rc1: 2024-03-22 10:09:08 -07:00
virt
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virtio
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w1
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watchdog
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xen
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zorro
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Kconfig
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Makefile
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