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| author | Kees Cook <keescook@chromium.org> | 2018-11-30 23:36:58 +0100 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2018-12-04 02:11:02 +0100 |
| commit | ea84b580b95521644429cc6748b6c2bf27c8b0f3 (patch) | |
| tree | 85cffd2d9d61cd2ee0fe379384f9f2fe12292598 /drivers/acpi | |
| parent | pstore: Fix bool initialization/comparison (diff) | |
| download | linux-ea84b580b95521644429cc6748b6c2bf27c8b0f3.tar.xz linux-ea84b580b95521644429cc6748b6c2bf27c8b0f3.zip | |
pstore: Convert buf_lock to semaphore
Instead of running with interrupts disabled, use a semaphore. This should
make it easier for backends that may need to sleep (e.g. EFI) when
performing a write:
|BUG: sleeping function called from invalid context at kernel/sched/completion.c:99
|in_atomic(): 1, irqs_disabled(): 1, pid: 2236, name: sig-xstate-bum
|Preemption disabled at:
|[<ffffffff99d60512>] pstore_dump+0x72/0x330
|CPU: 26 PID: 2236 Comm: sig-xstate-bum Tainted: G D 4.20.0-rc3 #45
|Call Trace:
| dump_stack+0x4f/0x6a
| ___might_sleep.cold.91+0xd3/0xe4
| __might_sleep+0x50/0x90
| wait_for_completion+0x32/0x130
| virt_efi_query_variable_info+0x14e/0x160
| efi_query_variable_store+0x51/0x1a0
| efivar_entry_set_safe+0xa3/0x1b0
| efi_pstore_write+0x109/0x140
| pstore_dump+0x11c/0x330
| kmsg_dump+0xa4/0xd0
| oops_exit+0x22/0x30
...
Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Fixes: 21b3ddd39fee ("efi: Don't use spinlocks for efi vars")
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/apei/erst.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c index a5e1d963208e..9953e50667ec 100644 --- a/drivers/acpi/apei/erst.c +++ b/drivers/acpi/apei/erst.c @@ -1176,7 +1176,6 @@ static int __init erst_init(void) "Error Record Serialization Table (ERST) support is initialized.\n"); buf = kmalloc(erst_erange.size, GFP_KERNEL); - spin_lock_init(&erst_info.buf_lock); if (buf) { erst_info.buf = buf + sizeof(struct cper_pstore_record); erst_info.bufsize = erst_erange.size - |