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70b565bbdb
This patch prevents resetting the cxl adapter via sysfs in presence of
one or more active cxl_context on it. This protects against an
unrecoverable error caused by PSL owning a dirty cache line even after
reset and host tries to touch the same cache line. In case a force reset
of the card is required irrespective of any active contexts, the int
value -1 can be stored in the 'reset' sysfs attribute of the card.
The patch introduces a new atomic_t member named contexts_num inside
struct cxl that holds the number of active context attached to the card
, which is checked against '0' before proceeding with the reset. To
prevent against a race condition where a context is activated just after
reset check is performed, the contexts_num is atomically set to '-1'
after reset-check to indicate that no more contexts can be activated on
the card anymore.
Before activating a context we atomically test if contexts_num is
non-negative and if so, increment its value by one. In case the value of
contexts_num is negative then it indicates that the card is about to be
reset and context activation is error-ed out at that point.
Fixes:
|
||
|---|---|---|
| .. | ||
| altera-stapl | ||
| c2port | ||
| cb710 | ||
| cxl | ||
| echo | ||
| eeprom | ||
| genwqe | ||
| ibmasm | ||
| lis3lv02d | ||
| mei | ||
| mic | ||
| sgi-gru | ||
| sgi-xp | ||
| ti-st | ||
| vmw_vmci | ||
| ad525x_dpot-i2c.c | ||
| ad525x_dpot-spi.c | ||
| ad525x_dpot.c | ||
| ad525x_dpot.h | ||
| apds990x.c | ||
| apds9802als.c | ||
| arm-charlcd.c | ||
| atmel_tclib.c | ||
| atmel-ssc.c | ||
| bh1770glc.c | ||
| cs5535-mfgpt.c | ||
| ds1682.c | ||
| dummy-irq.c | ||
| enclosure.c | ||
| fsa9480.c | ||
| hmc6352.c | ||
| hpilo.c | ||
| hpilo.h | ||
| ics932s401.c | ||
| ioc4.c | ||
| isl29003.c | ||
| isl29020.c | ||
| Kconfig | ||
| kgdbts.c | ||
| lattice-ecp3-config.c | ||
| lkdtm_bugs.c | ||
| lkdtm_core.c | ||
| lkdtm_heap.c | ||
| lkdtm_perms.c | ||
| lkdtm_rodata.c | ||
| lkdtm_usercopy.c | ||
| lkdtm.h | ||
| Makefile | ||
| panel.c | ||
| pch_phub.c | ||
| phantom.c | ||
| pti.c | ||
| qcom-coincell.c | ||
| spear13xx_pcie_gadget.c | ||
| sram.c | ||
| ti_dac7512.c | ||
| tifm_7xx1.c | ||
| tifm_core.c | ||
| tsl2550.c | ||
| vexpress-syscfg.c | ||
| vmw_balloon.c | ||