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197267d035
linux/drivers/misc
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Frederic Barrat 197267d035 cxl: Fix driver use count 
cxl keeps a driver use count, which is used with the hash memory model
on p8 to know when to upgrade local TLBIs to global and to trigger
callbacks to manage the MMU for PSL8.

If a process opens a context and closes without attaching or fails the
attachment, the driver use count is never decremented. As a
consequence, TLB invalidations remain global, even if there are no
active cxl contexts.

We should increment the driver use count when the process is attaching
to the cxl adapter, and not on open. It's not needed before the
adapter starts using the context and the use count is decremented on
the detach path, so it makes more sense.

It affects only the user api. The kernel api is already doing The
Right Thing.

Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # v4.2+
Fixes: 7bb5d91a4d ("cxl: Rework context lifetimes")
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-08-31 14:26:49 +10:00
..
altera-stapl
c2port drivers/misc/c2port/c2port-duramar2150.c: checking for NULL instead of IS_ERR() 2017-05-08 17:15:10 -07:00
cb710
cxl cxl: Fix driver use count 2017-08-31 14:26:49 +10:00
echo
eeprom eeprom: idt_89hpesx: Add OF device ID table 2017-04-08 18:22:59 +02:00
genwqe sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
ibmasm sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
lis3lv02d sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
mei mei: drop unreachable code in mei_start 2017-06-13 15:46:18 +02:00
mic virtio: add context flag to find vqs 2017-05-02 23:41:43 +03:00
sgi-gru mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
sgi-xp sgi-xp: Use designated initializers 2017-05-28 10:22:42 -07:00
ti-st networking: introduce and use skb_put_data() 2017-06-16 11:48:37 -04:00
vmw_vmci drivers/misc/vmw_vmci/vmci_queue_pair.c: fix a couple integer overflow tests 2017-05-08 17:15:10 -07:00
ad525x_dpot-i2c.c
ad525x_dpot-spi.c
ad525x_dpot.c misc: ad525x_dpot: Fix the enabling of the "otpXen" attributes 2016-03-01 16:55:13 -08:00
ad525x_dpot.h
apds990x.c misc: apds990x: Use sysfs_match_string() helper 2017-06-13 16:03:22 +02:00
apds9802als.c
aspeed-lpc-ctrl.c drivers/misc: aspeed-lpc-ctrl: fix printk format warning again 2017-04-08 17:37:20 +02:00
aspeed-lpc-snoop.c drivers/misc: add Aspeed LPC snoop driver 2017-06-03 19:15:18 +09:00
atmel_tclib.c
atmel-ssc.c misc: atmel-ssc: register as sound DAI if #sound-dai-cells is present 2016-12-15 12:13:31 +00:00
bh1770glc.c misc: bh1770glc: move header file out of I2C realm 2017-05-25 18:25:00 +02:00
cs5535-mfgpt.c
ds1682.c misc: ds1682: Add OF device ID table 2017-04-08 18:22:59 +02:00
dummy-irq.c Annotate hardware config module parameters in drivers/misc/ 2017-04-20 12:02:32 +01:00
enclosure.c scsi: ses: do not add a device to an enclosure if enclosure_add_links() fails. 2017-07-01 16:52:38 -04:00
fsa9480.c
hmc6352.c
hpilo.c drivers/misc/hpilo: Changes to support new security states in iLO5 FW 2016-09-27 12:53:46 +02:00
hpilo.h
ics932s401.c
ioc4.c
isl29003.c
isl29020.c
Kconfig drivers/misc: add Aspeed LPC snoop driver 2017-06-03 19:15:18 +09:00
kgdbts.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h> 2017-03-02 08:42:35 +01:00
lattice-ecp3-config.c
lkdtm_bugs.c misc: lkdtm: Add volatile to intentional NULL pointer reference 2017-04-18 18:03:42 +02:00
lkdtm_core.c lkdtm: add bad USER_DS test 2017-04-08 17:56:02 +02:00
lkdtm_heap.c sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h> 2017-03-02 08:42:31 +01:00
lkdtm_perms.c lkdtm: Do not use flush_icache_range() on user addresses 2016-11-10 15:34:56 +01:00
lkdtm_rodata.c lkdtm: Mark lkdtm_rodata_do_nothing() notrace 2016-08-31 13:12:38 +02:00
lkdtm_usercopy.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
lkdtm.h lkdtm: add bad USER_DS test 2017-04-08 17:56:02 +02:00
Makefile drivers/misc: add Aspeed LPC snoop driver 2017-06-03 19:15:18 +09:00
pch_phub.c misc: pch_phub: Add UART_CLK quirk for Boston platform 2016-08-31 15:45:18 +02:00
pci_endpoint_test.c misc: Add host side PCI driver for PCI test function device 2017-04-28 10:23:19 -05:00
phantom.c
pti.c
qcom-coincell.c ARM: qcom: silence an uninitialized variable warning 2016-05-01 14:20:04 -07:00
spear13xx_pcie_gadget.c
sram-exec.c misc: sram-exec: Use aligned fncpy instead of memcpy 2017-05-18 17:37:52 +02:00
sram.c misc: sram: Integrate protect-exec reserved sram area type 2017-01-25 11:48:03 +01:00
sram.h misc: sram: Integrate protect-exec reserved sram area type 2017-01-25 11:48:03 +01:00
ti_dac7512.c
tifm_7xx1.c
tifm_core.c
tsl2550.c misc: tsl2550: Add OF device ID table 2017-04-08 18:22:59 +02:00
vexpress-syscfg.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
vmw_balloon.c