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Fix the (i)Stallion driver's putchar() and break_ctl() ops

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Fix the Stallion driver's putchar() and break_ctl() ops and iStallion's
putchar() to return values.

Is it actually possible for putchar() or break_ctl() to be called with tty ==
NULL or can the check be discarded?

Should stl_write() be returning 0 if tty->driver_data is NULL or tx.buf is
NULL?  Is this even possible?

I've made Stallion's functions return -EINVAL as stli_breakctl() if the checks
fail.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2008-07-22 11:18:43 +01:00 committed by Linus Torvalds
parent 781cff5cb2
commit 4a56122297
1 changed files with 9 additions and 7 deletions
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16
drivers/char/stallion.c
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@ -1025,7 +1025,7 @@ static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count
/*****************************************************************************/
static void stl_putchar(struct tty_struct *tty, unsigned char ch)
static int stl_putchar(struct tty_struct *tty, unsigned char ch)
{
struct stlport *portp;
unsigned int len;
@ -1034,12 +1034,12 @@ static void stl_putchar(struct tty_struct *tty, unsigned char ch)
pr_debug("stl_putchar(tty=%p,ch=%x)\n", tty, ch);
if (tty == NULL)
return;
return -EINVAL;
portp = tty->driver_data;
if (portp == NULL)
return;
return -EINVAL;
if (portp->tx.buf == NULL)
return;
return -EINVAL;
head = portp->tx.head;
tail = portp->tx.tail;
@ -1053,6 +1053,7 @@ static void stl_putchar(struct tty_struct *tty, unsigned char ch)
head = portp->tx.buf;
}
portp->tx.head = head;
return 0;
}
/*****************************************************************************/
@ -1460,19 +1461,20 @@ static void stl_hangup(struct tty_struct *tty)
/*****************************************************************************/
static void stl_breakctl(struct tty_struct *tty, int state)
static int stl_breakctl(struct tty_struct *tty, int state)
{
struct stlport *portp;
pr_debug("stl_breakctl(tty=%p,state=%d)\n", tty, state);
if (tty == NULL)
return;
return -EINVAL;
portp = tty->driver_data;
if (portp == NULL)
return;
return -EINVAL;
stl_sendbreak(portp, ((state == -1) ? 1 : 2));
return 0;
}
/*****************************************************************************/