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sh: Fix up spurious syscall restarting.

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The T-bit manipulation for syscall error checking had the side effect of
spuriously returning ERESTART* errno values over EINTR. So, we simplify
the error checking a bit and leave the T-bit alone.

Reported-by: Kaz Kojima <kkojima@rr.iij4u.or.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-01-29 11:21:38 +09:00
parent 0f6dee232f
commit 03f07876df
4 changed files with 8 additions and 44 deletions
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22
arch/sh/include/asm/syscall_32.h
View file

@ -21,23 +21,10 @@ static inline void syscall_rollback(struct task_struct *task,
*/
}
static inline bool syscall_has_error(struct pt_regs *regs)
{
return (regs->sr & 0x1) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
regs->sr |= 0x1;
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
regs->sr &= ~0x1;
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
return syscall_has_error(regs) ? regs->regs[0] : 0;
return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0;
}
static inline long syscall_get_return_value(struct task_struct *task,
@ -50,13 +37,10 @@ static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
if (error) {
syscall_set_error(regs);
if (error)
regs->regs[0] = -error;
} else {
syscall_clear_error(regs);
else
regs->regs[0] = val;
}
}
static inline void syscall_get_arguments(struct task_struct *task,

22
arch/sh/include/asm/syscall_64.h
View file

@ -21,23 +21,10 @@ static inline void syscall_rollback(struct task_struct *task,
*/
}
static inline bool syscall_has_error(struct pt_regs *regs)
{
return (regs->sr & 0x1) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
regs->sr |= 0x1;
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
regs->sr &= ~0x1;
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
return syscall_has_error(regs) ? regs->regs[9] : 0;
return IS_ERR_VALUE(regs->regs[9]) ? regs->regs[9] : 0;
}
static inline long syscall_get_return_value(struct task_struct *task,
@ -50,13 +37,10 @@ static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
if (error) {
syscall_set_error(regs);
if (error)
regs->regs[9] = -error;
} else {
syscall_clear_error(regs);
else
regs->regs[9] = val;
}
}
static inline void syscall_get_arguments(struct task_struct *task,

4
arch/sh/kernel/signal_32.c
View file

@ -510,7 +510,6 @@ handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs,
case -ERESTARTNOHAND:
no_system_call_restart:
regs->regs[0] = -EINTR;
regs->sr |= 1;
break;
case -ERESTARTSYS:
@ -589,8 +588,7 @@ static void do_signal(struct pt_regs *regs, unsigned int save_r0)
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
if (regs->sr & 1)
handle_syscall_restart(save_r0, regs, &ka.sa);
handle_syscall_restart(save_r0, regs, &ka.sa);
/* Whee! Actually deliver the signal. */
if (handle_signal(signr, &ka, &info, oldset,

4
arch/sh/kernel/signal_64.c
View file

@ -60,7 +60,6 @@ handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa)
case -ERESTARTNOHAND:
no_system_call_restart:
regs->regs[REG_RET] = -EINTR;
regs->sr |= 1;
break;
case -ERESTARTSYS:
@ -109,8 +108,7 @@ static int do_signal(struct pt_regs *regs, sigset_t *oldset)
signr = get_signal_to_deliver(&info, &ka, regs, 0);
if (signr > 0) {
if (regs->sr & 1)
handle_syscall_restart(regs, &ka.sa);
handle_syscall_restart(regs, &ka.sa);
/* Whee! Actually deliver the signal. */
if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {