linux-stable.git/drivers/staging, branch v4.19.26

staging: erofs: unzip_vle_lz4.c,utils.c: rectify BUG_ONs

2019-02-27T09:09:02+00:00

commit b8e076a6ef253e763bfdb81e5c72bcc828b0fbeb upstream.

remove all redundant BUG_ONs, and turn the rest
useful usages to DBG_BUGONs.

Signed-off-by: Gao Xiang 
Reviewed-by: Chao Yu 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: unzip_{pagevec.h,vle.c}: rectify BUG_ONs

2019-02-27T09:09:02+00:00

commit 70b17991d89554cdd16f3e4fb0179bcc03c808d9 upstream.

remove all redundant BUG_ONs, and turn the rest
useful usages to DBG_BUGONs.

Signed-off-by: Gao Xiang 
Reviewed-by: Chao Yu 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: {dir,inode,super}.c: rectify BUG_ONs

2019-02-27T09:09:02+00:00

commit 8b987bca2d09649683cbe496419a011df8c08493 upstream.

remove all redundant BUG_ONs, and turn the rest
useful usages to DBG_BUGONs.

Signed-off-by: Gao Xiang 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: add a full barrier in erofs_workgroup_unfreeze

2019-02-27T09:09:02+00:00

commit 948bbdb1818b7ad6e539dad4fbd2dd4650793ea9 upstream.

Just like other generic locks, insert a full barrier
in case of memory reorder.

Reviewed-by: Chao Yu 
Signed-off-by: Gao Xiang 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: fix `erofs_workgroup_{try_to_freeze, unfreeze}'

2019-02-27T09:09:02+00:00

commit 73f5c66df3e26ab750cefcb9a3e08c71c9f79cad upstream.

There are two minor issues in the current freeze interface:

   1) Freeze interfaces have not related with CONFIG_DEBUG_SPINLOCK,
      therefore fix the incorrect conditions;

   2) For SMP platforms, it should also disable preemption before
      doing atomic_cmpxchg in case that some high priority tasks
      preempt between atomic_cmpxchg and disable_preempt, then spin
      on the locked refcount later.

Reviewed-by: Chao Yu 
Signed-off-by: Gao Xiang 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: atomic_cond_read_relaxed on ref-locked workgroup

2019-02-27T09:09:02+00:00

commit df134b8d17b90c1e7720e318d36416b57424ff7a upstream.

It's better to use atomic_cond_read_relaxed, which is implemented
in hardware instructions to monitor a variable changes currently
for ARM64, instead of open-coded busy waiting.

Reviewed-by: Chao Yu 
Signed-off-by: Gao Xiang 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: remove the redundant d_rehash() for the root dentry

2019-02-27T09:09:02+00:00

commit e9c892465583c8f42d61fafe30970d36580925df upstream.

There is actually no need at all to d_rehash() for the root dentry
as Al pointed out, fix it.

Reported-by: Al Viro 
Cc: Al Viro 
Signed-off-by: Gao Xiang 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: drop multiref support temporarily

2019-02-27T09:09:01+00:00

commit e5e3abbadf0dbd1068f64f8abe70401c5a178180 upstream.

Multiref support means that a compressed page could have
more than one reference, which is designed for on-disk data
deduplication. However, mkfs doesn't support this mode
at this moment, and the kernel implementation is also broken.

Let's drop multiref support. If it is fully implemented
in the future, it can be reverted later.

Signed-off-by: Gao Xiang 
Reviewed-by: Chao Yu 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: replace BUG_ON with DBG_BUGON in data.c

2019-02-27T09:09:01+00:00

commit 9141b60cf6a53c99f8a9309bf8e1c6650a6785c1 upstream.

This patch replace BUG_ON with DBG_BUGON in data.c, and add necessary
error handler.

Signed-off-by: Chen Gong 
Reviewed-by: Gao Xiang 
Reviewed-by: Chao Yu 
Signed-off-by: Gao Xiang 
Signed-off-by: Greg Kroah-Hartman

staging: erofs: complete error handing of z_erofs_do_read_page

2019-02-27T09:09:01+00:00

commit 1e05ff36e6921ca61bdbf779f81a602863569ee3 upstream.

This patch completes error handing code of z_erofs_do_read_page.
PG_error will be set when some read error happens, therefore
z_erofs_onlinepage_endio will unlock this page without setting
PG_uptodate.

Reviewed-by: Chao Yu 
Signed-off-by: Gao Xiang 
Signed-off-by: Greg Kroah-Hartman