CNSS prealloc maintains various prealloc pools of 8Kb, 16Kb, 32Kb
and so on, and allocates buffer from the pool for wlan driver. When
wlan driver requests to free the memory buffer then CNSS prealloc
needs to first find out mempool id from which this buffer was allocated.
Use slab_cache from slab struct to identify memory pool id. Until
kernel 5.16, slab_cache was part of page struct but in kernel 5.17,
slab_cache is moved out to mm/slab.h file.
Also change WCNSS_PRE_ALLOC_GET_THRESHOLD to 8Kb to match with
cnss_pool_alloc_threshold.
Change-Id: I4e34d8f0b855c210cc9af30c1f4a0d6c7e43ab00
CRs-Fixed: 3414037
Pointer for memory pool may be null if it fails to
create memory pool in cnss_pool_init().
Add null pointer check before accessing memory pool.
Change-Id: I8ae2b6a5193cffdcba3990b238178a1b93297925
CRs-Fixed: 3332360
CNSS prealloc maintains various prealloc pools of 8Kb, 16Kb, 32Kb
and so on, and allocates buffer from the pool for wlan driver. When
wlan driver requests to free the memory buffer then CNSS prealloc
derives slab_cache from virtual memory via page struct to identify
prealloc pool id to put memory buffer back into the pool.
In kernel 5.17, slab_cache is removed from the page struct. Add new
functions to store cache at the beginning of allocated buffer and
when wlan driver requests to free the memory then use that cache to
identify CNSS prealloc pool to put back memory.
Change-Id: I6b3a54d3f502d977c6a61cfa6aeae597df9c8e72
CRs-Fixed: 3309289
According to kernel comment for in_atomic(), it's
incorrect to use it outside core kernel code.
To follow this rule, replace
(irqs_disabled() || in_atomic()) with (!preemptible())
when getting GFP flags.
Change-Id: I7cdb28a7f12ffd60216c7bc1921a277de6113cb5
CRs-Fixed: 3273779
As per implementation of might_sleep(), rcu_read_lock()
nesting depth should be take into consideration too to
figure out whether sleeping is allowable or not.
To make align with it, allocate memory with GFP_ATOMIC
if rcu_read_lock() nesting depth is not zero.
Change-Id: Ib225a33b1a3f37b919e41daf064ce2de44428973
CRs-Fixed: 3271651
Use CONFIG_CNSS_OUT_OF_TREE to control if CNSS family drivers are
built from in-kernel-tree source or out-of-kernel-tree source since
the exposed header files will be in different paths. This is also
for backward compatibility.
Change-Id: I24111fdb76607bf911c29e415d42d25609f9b26c
Bring CNSS family drivers from msm-5.10 kernel as of commit
cc3bc4b888af (cnss2: Fix a few switch statement fallthrough
issues) to WLAN platform project. Fix SPDX-License format for
a few files as well.
drivers/net/wireless/cnss* -> .
include/net/cnss* -> inc/
Above shows how directories and header files are relocated.
Change-Id: If8fd40a35c9fdbeb1aa76a8aac5fdb1fc1c7e786
