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authorEric W. Biederman <ebiederm@xmission.com>2007-02-10 01:44:34 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:24 -0800
commit8b6312f4dcc1efe7975731b6c47dd134282bd9ac (patch)
tree71c94b01bda940c5610d448d0f4a2aa3c7665b4c /drivers/char/sysrq.c
parent0a7b35cb18c52d651f6ed9cd59edc979200ab880 (diff)
downloadop-kernel-dev-8b6312f4dcc1efe7975731b6c47dd134282bd9ac.zip
op-kernel-dev-8b6312f4dcc1efe7975731b6c47dd134282bd9ac.tar.gz
[PATCH] vt: refactor console SAK processing
This does several things. - It moves looking up of the current foreground console into process context where we can safely take the semaphore that protects this operation. - It uses the new flavor of work queue processing. - This generates a factor of do_SAK, __do_SAK that runs immediately. - This calls __do_SAK with the console semaphore held ensuring nothing else happens to the console while we process the SAK operation. - With the console SAK processing moved into process context this patch removes the xchg operations that I used to attempt to attomically update struct pid, because of the strange locking used in the SAK processing. With SAK using the normal console semaphore nothing special is needed. Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/sysrq.c')
-rw-r--r--drivers/char/sysrq.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 7fd3cd5..3757610 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -88,9 +88,9 @@ static struct sysrq_key_op sysrq_loglevel_op = {
#ifdef CONFIG_VT
static void sysrq_handle_SAK(int key, struct tty_struct *tty)
{
- if (tty)
- do_SAK(tty);
- reset_vc(vc_cons[fg_console].d);
+ struct work_struct *SAK_work = &vc_cons[fg_console].SAK_work;
+ PREPARE_WORK(SAK_work, vc_SAK);
+ schedule_work(SAK_work);
}
static struct sysrq_key_op sysrq_SAK_op = {
.handler = sysrq_handle_SAK,
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