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authorAlan Cox <alan@redhat.com>2008-10-13 10:41:16 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-13 09:51:42 -0700
commitbf7a06bcce205705ea5c7675cbb8ea9239ea30a0 (patch)
tree98decd6b145bb9e42350190bb32178584e4caca6
parent15582d36a15978355d2168eaa018a3736db7281f (diff)
vt: remove bogus lock dropping
For hysterical raisins the vt layer drops and retakes locks in the write method. This is a left over from the days when user/kernel data was passed directly to the tty not pre-buffered. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/char/vt.c18
1 files changed, 0 insertions, 18 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 05ca1c5dcb1..ec94521c311 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2136,27 +2136,9 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
release_console_sem();
return 0;
}
- release_console_sem();
-
orig_buf = buf;
orig_count = count;
- /* At this point 'buf' is guaranteed to be a kernel buffer
- * and therefore no access to userspace (and therefore sleeping)
- * will be needed. The con_buf_mtx serializes all tty based
- * console rendering and vcs write/read operations. We hold
- * the console spinlock during the entire write.
- */
-
- acquire_console_sem();
-
- vc = tty->driver_data;
- if (vc == NULL) {
- printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
- release_console_sem();
- goto out;
- }
-
himask = vc->vc_hi_font_mask;
charmask = himask ? 0x1ff : 0xff;