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staging: dgnc: remove dead code in dgnc_tty_write()

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Remove the dead code protected by in_user in dgnc_tty_write() because it
is set to 0 and never changed to 1 thus the code in ifs never gets
executed.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Giedrius Statkevičius 2015-04-10 17:48:54 +03:00 committed by Greg Kroah-Hartman
parent dc44f4e17c
commit a74d8e2167
1 changed files with 1 additions and 44 deletions
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45
drivers/staging/dgnc/dgnc_tty.c
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@ -42,16 +42,11 @@
#include "dgnc_sysfs.h"
#include "dgnc_utils.h"
#define init_MUTEX(sem) sema_init(sem, 1)
#define DECLARE_MUTEX(name) \
struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
/*
* internal variables
*/
static struct dgnc_board *dgnc_BoardsByMajor[256];
static unsigned char *dgnc_TmpWriteBuf;
static DECLARE_MUTEX(dgnc_TmpWriteSem);
/*
* Default transparent print information.
@ -1692,7 +1687,6 @@ static int dgnc_tty_write(struct tty_struct *tty,
ushort tail;
ushort tmask;
uint remain;
int from_user = 0;
if (tty == NULL || dgnc_TmpWriteBuf == NULL)
return 0;
@ -1772,38 +1766,6 @@ static int dgnc_tty_write(struct tty_struct *tty,
if (count <= 0)
goto exit_retry;
if (from_user) {
count = min(count, WRITEBUFLEN);
spin_unlock_irqrestore(&ch->ch_lock, flags);
/*
* If data is coming from user space, copy it into a temporary
* buffer so we don't get swapped out while doing the copy to
* the board.
*/
/* we're allowed to block if it's from_user */
if (down_interruptible(&dgnc_TmpWriteSem))
return -EINTR;
/*
* copy_from_user() returns the number
* of bytes that could *NOT* be copied.
*/
count -= copy_from_user(dgnc_TmpWriteBuf, (const unsigned char __user *) buf, count);
if (!count) {
up(&dgnc_TmpWriteSem);
return -EFAULT;
}
spin_lock_irqsave(&ch->ch_lock, flags);
buf = dgnc_TmpWriteBuf;
}
n = count;
/*
@ -1840,12 +1802,7 @@ static int dgnc_tty_write(struct tty_struct *tty,
ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps;
}
if (from_user) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
up(&dgnc_TmpWriteSem);
} else {
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (count) {
/*