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Xtensa fixes for v5.18:

Browse source 
- fix patching CPU selection in patch_text
 - fix potential deadlock in ISS platform serial driver
 - fix potential register clobbering in coprocessor exception handler
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Merge tag 'xtensa-20220416' of https://github.com/jcmvbkbc/linux-xtensa

Pull xtensa fixes from Max Filippov:

 - fix patching CPU selection in patch_text

 - fix potential deadlock in ISS platform serial driver

 - fix potential register clobbering in coprocessor exception handler

* tag 'xtensa-20220416' of https://github.com/jcmvbkbc/linux-xtensa:
  xtensa: fix a7 clobbering in coprocessor context load/store
  arch: xtensa: platforms: Fix deadlock in rs_close()
  xtensa: patch_text: Fixup last cpu should be master
This commit is contained in:
Linus Torvalds 2022-04-20 12:43:27 -07:00
commit b253435746
3 changed files with 3 additions and 11 deletions
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4
arch/xtensa/kernel/coprocessor.S
View file

@ -29,7 +29,7 @@
.if XTENSA_HAVE_COPROCESSOR(x); \
.align 4; \
.Lsave_cp_regs_cp##x: \
xchal_cp##x##_store a2 a4 a5 a6 a7; \
xchal_cp##x##_store a2 a3 a4 a5 a6; \
jx a0; \
.endif
@ -46,7 +46,7 @@
.if XTENSA_HAVE_COPROCESSOR(x); \
.align 4; \
.Lload_cp_regs_cp##x: \
xchal_cp##x##_load a2 a4 a5 a6 a7; \
xchal_cp##x##_load a2 a3 a4 a5 a6; \
jx a0; \
.endif

2
arch/xtensa/kernel/jump_label.c
View file

@ -40,7 +40,7 @@ static int patch_text_stop_machine(void *data)
{
struct patch *patch = data;
if (atomic_inc_return(&patch->cpu_count) == 1) {
if (atomic_inc_return(&patch->cpu_count) == num_online_cpus()) {
local_patch_text(patch->addr, patch->data, patch->sz);
atomic_inc(&patch->cpu_count);
} else {

8
arch/xtensa/platforms/iss/console.c
View file

@ -36,24 +36,19 @@ static void rs_poll(struct timer_list *);
static struct tty_driver *serial_driver;
static struct tty_port serial_port;
static DEFINE_TIMER(serial_timer, rs_poll);
static DEFINE_SPINLOCK(timer_lock);
static int rs_open(struct tty_struct *tty, struct file * filp)
{
spin_lock_bh(&timer_lock);
if (tty->count == 1)
mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
spin_unlock_bh(&timer_lock);
return 0;
}
static void rs_close(struct tty_struct *tty, struct file * filp)
{
spin_lock_bh(&timer_lock);
if (tty->count == 1)
del_timer_sync(&serial_timer);
spin_unlock_bh(&timer_lock);
}
@ -73,8 +68,6 @@ static void rs_poll(struct timer_list *unused)
int rd = 1;
unsigned char c;
spin_lock(&timer_lock);
while (simc_poll(0)) {
rd = simc_read(0, &c, 1);
if (rd <= 0)
@ -87,7 +80,6 @@ static void rs_poll(struct timer_list *unused)
tty_flip_buffer_push(port);
if (rd)
mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
spin_unlock(&timer_lock);
}