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Diffstat (limited to 'arch/um/drivers/chan_kern.c')
-rw-r--r--arch/um/drivers/chan_kern.c103
1 files changed, 43 insertions, 60 deletions
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 7d4190e5565..7b8baf146ac 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -19,44 +19,11 @@
#include "line.h"
#include "os.h"
-/* XXX: could well be moved to somewhere else, if needed. */
-static int my_printf(const char * fmt, ...)
- __attribute__ ((format (printf, 1, 2)));
-
-static int my_printf(const char * fmt, ...)
-{
- /* Yes, can be called on atomic context.*/
- char *buf = kmalloc(4096, GFP_ATOMIC);
- va_list args;
- int r;
-
- if (!buf) {
- /* We print directly fmt.
- * Yes, yes, yes, feel free to complain. */
- r = strlen(fmt);
- } else {
- va_start(args, fmt);
- r = vsprintf(buf, fmt, args);
- va_end(args);
- fmt = buf;
- }
-
- if (r)
- r = os_write_file(1, fmt, r);
- return r;
-
-}
-
#ifdef CONFIG_NOCONFIG_CHAN
-/* Despite its name, there's no added trailing newline. */
-static int my_puts(const char * buf)
-{
- return os_write_file(1, buf, strlen(buf));
-}
-
-static void *not_configged_init(char *str, int device, struct chan_opts *opts)
+static void *not_configged_init(char *str, int device,
+ const struct chan_opts *opts)
{
- my_puts("Using a channel type which is configured out of "
+ printk("Using a channel type which is configured out of "
"UML\n");
return NULL;
}
@@ -64,34 +31,34 @@ static void *not_configged_init(char *str, int device, struct chan_opts *opts)
static int not_configged_open(int input, int output, int primary, void *data,
char **dev_out)
{
- my_puts("Using a channel type which is configured out of "
+ printk("Using a channel type which is configured out of "
"UML\n");
return -ENODEV;
}
static void not_configged_close(int fd, void *data)
{
- my_puts("Using a channel type which is configured out of "
+ printk("Using a channel type which is configured out of "
"UML\n");
}
static int not_configged_read(int fd, char *c_out, void *data)
{
- my_puts("Using a channel type which is configured out of "
+ printk("Using a channel type which is configured out of "
"UML\n");
return -EIO;
}
static int not_configged_write(int fd, const char *buf, int len, void *data)
{
- my_puts("Using a channel type which is configured out of "
+ printk("Using a channel type which is configured out of "
"UML\n");
return -EIO;
}
static int not_configged_console_write(int fd, const char *buf, int len)
{
- my_puts("Using a channel type which is configured out of "
+ printk("Using a channel type which is configured out of "
"UML\n");
return -EIO;
}
@@ -99,14 +66,14 @@ static int not_configged_console_write(int fd, const char *buf, int len)
static int not_configged_window_size(int fd, void *data, unsigned short *rows,
unsigned short *cols)
{
- my_puts("Using a channel type which is configured out of "
+ printk("Using a channel type which is configured out of "
"UML\n");
return -ENODEV;
}
static void not_configged_free(void *data)
{
- my_puts("Using a channel type which is configured out of "
+ printk("Using a channel type which is configured out of "
"UML\n");
}
@@ -255,15 +222,28 @@ void enable_chan(struct line *line)
}
}
+/* Items are added in IRQ context, when free_irq can't be called, and
+ * removed in process context, when it can.
+ * This handles interrupt sources which disappear, and which need to
+ * be permanently disabled. This is discovered in IRQ context, but
+ * the freeing of the IRQ must be done later.
+ */
+static DEFINE_SPINLOCK(irqs_to_free_lock);
static LIST_HEAD(irqs_to_free);
void free_irqs(void)
{
struct chan *chan;
+ LIST_HEAD(list);
+ struct list_head *ele;
- while(!list_empty(&irqs_to_free)){
- chan = list_entry(irqs_to_free.next, struct chan, free_list);
- list_del(&chan->free_list);
+ spin_lock_irq(&irqs_to_free_lock);
+ list_splice_init(&irqs_to_free, &list);
+ INIT_LIST_HEAD(&irqs_to_free);
+ spin_unlock_irq(&irqs_to_free_lock);
+
+ list_for_each(ele, &list){
+ chan = list_entry(ele, struct chan, free_list);
if(chan->input)
free_irq(chan->line->driver->read_irq, chan);
@@ -279,7 +259,9 @@ static void close_one_chan(struct chan *chan, int delay_free_irq)
return;
if(delay_free_irq){
+ spin_lock_irq(&irqs_to_free_lock);
list_add(&chan->free_list, &irqs_to_free);
+ spin_unlock_irq(&irqs_to_free_lock);
}
else {
if(chan->input)
@@ -372,8 +354,7 @@ int console_write_chan(struct list_head *chans, const char *buf, int len)
return ret;
}
-int console_open_chan(struct line *line, struct console *co,
- const struct chan_opts *opts)
+int console_open_chan(struct line *line, struct console *co)
{
int err;
@@ -381,7 +362,7 @@ int console_open_chan(struct line *line, struct console *co,
if(err)
return err;
- printk("Console initialized on /dev/%s%d\n",co->name,co->index);
+ printk("Console initialized on /dev/%s%d\n", co->name, co->index);
return 0;
}
@@ -534,7 +515,7 @@ static const struct chan_type chan_table[] = {
};
static struct chan *parse_chan(struct line *line, char *str, int device,
- const struct chan_opts *opts)
+ const struct chan_opts *opts, char **error_out)
{
const struct chan_type *entry;
const struct chan_ops *ops;
@@ -553,19 +534,21 @@ static struct chan *parse_chan(struct line *line, char *str, int device,
}
}
if(ops == NULL){
- my_printf("parse_chan couldn't parse \"%s\"\n",
- str);
+ *error_out = "No match for configured backends";
return NULL;
}
- if(ops->init == NULL)
- return NULL;
+
data = (*ops->init)(str, device, opts);
- if(data == NULL)
+ if(data == NULL){
+ *error_out = "Configuration failed";
return NULL;
+ }
chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
- if(chan == NULL)
+ if(chan == NULL){
+ *error_out = "Memory allocation failed";
return NULL;
+ }
*chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
.free_list =
LIST_HEAD_INIT(chan->free_list),
@@ -582,7 +565,7 @@ static struct chan *parse_chan(struct line *line, char *str, int device,
}
int parse_chan_pair(char *str, struct line *line, int device,
- const struct chan_opts *opts)
+ const struct chan_opts *opts, char **error_out)
{
struct list_head *chans = &line->chan_list;
struct chan *new, *chan;
@@ -599,14 +582,14 @@ int parse_chan_pair(char *str, struct line *line, int device,
in = str;
*out = '\0';
out++;
- new = parse_chan(line, in, device, opts);
+ new = parse_chan(line, in, device, opts, error_out);
if(new == NULL)
return -1;
new->input = 1;
list_add(&new->list, chans);
- new = parse_chan(line, out, device, opts);
+ new = parse_chan(line, out, device, opts, error_out);
if(new == NULL)
return -1;
@@ -614,7 +597,7 @@ int parse_chan_pair(char *str, struct line *line, int device,
new->output = 1;
}
else {
- new = parse_chan(line, str, device, opts);
+ new = parse_chan(line, str, device, opts, error_out);
if(new == NULL)
return -1;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-04 07:25:29 +0000