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| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2015-12-22 17:25:19 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-07 22:43:17 -0800 |
| commit | c74f7e8281add80bdfa0ad2998b8df287b13df73 (patch) | |
| tree | fa35e258056567f402ab9fc457c80ef9a03bbf29 /drivers/hwtracing/stm/stm.h | |
| parent | 4c127fd16e6b33ecb7badc091480c84ea9aebeb6 (diff) | |
| download | linux-stable-c74f7e8281add80bdfa0ad2998b8df287b13df73.tar.gz linux-stable-c74f7e8281add80bdfa0ad2998b8df287b13df73.tar.bz2 linux-stable-c74f7e8281add80bdfa0ad2998b8df287b13df73.zip | |
stm class: Fix link list locking
Currently, the list of stm_sources linked to an stm device is protected by
a spinlock, which also means that sources' .unlink() method is called under
this spinlock. However, this method may (and does) sleep, which means
trouble.
This patch slightly reworks locking around stm::link_list so that bits that
might_sleep() are called with a mutex held instead. Modification of this
list requires both mutex and spinlock to be held, while looking at the list
can be done under either mutex or spinlock.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/stm/stm.h')
| -rw-r--r-- | drivers/hwtracing/stm/stm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/hwtracing/stm/stm.h b/drivers/hwtracing/stm/stm.h index 95ece0292c99..97ee02241440 100644 --- a/drivers/hwtracing/stm/stm.h +++ b/drivers/hwtracing/stm/stm.h @@ -45,6 +45,7 @@ struct stm_device { int major; unsigned int sw_nmasters; struct stm_data *data; + struct mutex link_mutex; spinlock_t link_lock; struct list_head link_list; /* master allocation */ |