summaryrefslogtreecommitdiff
path: root/drivers/parport/procfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/parport/procfs.c')
-rw-r--r--drivers/parport/procfs.c185
1 files changed, 100 insertions, 85 deletions
diff --git a/drivers/parport/procfs.c b/drivers/parport/procfs.c
index d740eba3c099..4e5b972c3e26 100644
--- a/drivers/parport/procfs.c
+++ b/drivers/parport/procfs.c
@@ -32,6 +32,13 @@
#define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
#define PARPORT_MIN_SPINTIME_VALUE 1
#define PARPORT_MAX_SPINTIME_VALUE 1000
+/*
+ * PARPORT_BASE_* is the size of the known parts of the sysctl path
+ * in dev/partport/%s/devices/%s. "dev/parport/"(12), "/devices/"(9
+ * and null char(1).
+ */
+#define PARPORT_BASE_PATH_SIZE 13
+#define PARPORT_BASE_DEVICES_PATH_SIZE 22
static int do_active_device(struct ctl_table *table, int write,
void *result, size_t *lenp, loff_t *ppos)
@@ -236,13 +243,6 @@ do { \
return 0;
}
-#define PARPORT_PORT_DIR(CHILD) { .procname = NULL, .mode = 0555, .child = CHILD }
-#define PARPORT_PARPORT_DIR(CHILD) { .procname = "parport", \
- .mode = 0555, .child = CHILD }
-#define PARPORT_DEV_DIR(CHILD) { .procname = "dev", .mode = 0555, .child = CHILD }
-#define PARPORT_DEVICES_ROOT_DIR { .procname = "devices", \
- .mode = 0555, .child = NULL }
-
static const unsigned long parport_min_timeslice_value =
PARPORT_MIN_TIMESLICE_VALUE;
@@ -257,17 +257,16 @@ PARPORT_MAX_SPINTIME_VALUE;
struct parport_sysctl_table {
- struct ctl_table_header *sysctl_header;
+ struct ctl_table_header *port_header;
+ struct ctl_table_header *devices_header;
struct ctl_table vars[12];
struct ctl_table device_dir[2];
- struct ctl_table port_dir[2];
- struct ctl_table parport_dir[2];
- struct ctl_table dev_dir[2];
};
static const struct parport_sysctl_table parport_sysctl_template = {
- .sysctl_header = NULL,
- {
+ .port_header = NULL,
+ .devices_header = NULL,
+ {
{
.procname = "spintime",
.data = NULL,
@@ -305,7 +304,6 @@ static const struct parport_sysctl_table parport_sysctl_template = {
.mode = 0444,
.proc_handler = do_hardware_modes
},
- PARPORT_DEVICES_ROOT_DIR,
#ifdef CONFIG_PARPORT_1284
{
.procname = "autoprobe",
@@ -355,18 +353,6 @@ static const struct parport_sysctl_table parport_sysctl_template = {
},
{}
},
- {
- PARPORT_PORT_DIR(NULL),
- {}
- },
- {
- PARPORT_PARPORT_DIR(NULL),
- {}
- },
- {
- PARPORT_DEV_DIR(NULL),
- {}
- }
};
struct parport_device_sysctl_table
@@ -393,6 +379,7 @@ parport_device_sysctl_template = {
.extra1 = (void*) &parport_min_timeslice_value,
.extra2 = (void*) &parport_max_timeslice_value
},
+ {}
},
{
{
@@ -400,25 +387,8 @@ parport_device_sysctl_template = {
.data = NULL,
.maxlen = 0,
.mode = 0555,
- .child = NULL
},
{}
- },
- {
- PARPORT_DEVICES_ROOT_DIR,
- {}
- },
- {
- PARPORT_PORT_DIR(NULL),
- {}
- },
- {
- PARPORT_PARPORT_DIR(NULL),
- {}
- },
- {
- PARPORT_DEV_DIR(NULL),
- {}
}
};
@@ -454,30 +424,15 @@ parport_default_sysctl_table = {
.extra2 = (void*) &parport_max_spintime_value
},
{}
- },
- {
- {
- .procname = "default",
- .mode = 0555,
- .child = parport_default_sysctl_table.vars
- },
- {}
- },
- {
- PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
- {}
- },
- {
- PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir),
- {}
}
};
-
int parport_proc_register(struct parport *port)
{
struct parport_sysctl_table *t;
- int i;
+ char *tmp_dir_path;
+ size_t tmp_path_len, port_name_len;
+ int bytes_written, i, err = 0;
t = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
if (t == NULL)
@@ -485,28 +440,64 @@ int parport_proc_register(struct parport *port)
t->device_dir[0].extra1 = port;
- for (i = 0; i < 5; i++)
+ t->vars[0].data = &port->spintime;
+ for (i = 0; i < 5; i++) {
t->vars[i].extra1 = port;
+ t->vars[5 + i].extra2 = &port->probe_info[i];
+ }
- t->vars[0].data = &port->spintime;
- t->vars[5].child = t->device_dir;
-
- for (i = 0; i < 5; i++)
- t->vars[6 + i].extra2 = &port->probe_info[i];
+ port_name_len = strnlen(port->name, PARPORT_NAME_MAX_LEN);
+ /*
+ * Allocate a buffer for two paths: dev/parport/PORT and dev/parport/PORT/devices.
+ * We calculate for the second as that will give us enough for the first.
+ */
+ tmp_path_len = PARPORT_BASE_DEVICES_PATH_SIZE + port_name_len;
+ tmp_dir_path = kzalloc(tmp_path_len, GFP_KERNEL);
+ if (!tmp_dir_path) {
+ err = -ENOMEM;
+ goto exit_free_t;
+ }
- t->port_dir[0].procname = port->name;
+ bytes_written = snprintf(tmp_dir_path, tmp_path_len,
+ "dev/parport/%s/devices", port->name);
+ if (tmp_path_len <= bytes_written) {
+ err = -ENOENT;
+ goto exit_free_tmp_dir_path;
+ }
+ t->devices_header = register_sysctl(tmp_dir_path, t->device_dir);
+ if (t->devices_header == NULL) {
+ err = -ENOENT;
+ goto exit_free_tmp_dir_path;
+ }
- t->port_dir[0].child = t->vars;
- t->parport_dir[0].child = t->port_dir;
- t->dev_dir[0].child = t->parport_dir;
+ tmp_path_len = PARPORT_BASE_PATH_SIZE + port_name_len;
+ bytes_written = snprintf(tmp_dir_path, tmp_path_len,
+ "dev/parport/%s", port->name);
+ if (tmp_path_len <= bytes_written) {
+ err = -ENOENT;
+ goto unregister_devices_h;
+ }
- t->sysctl_header = register_sysctl_table(t->dev_dir);
- if (t->sysctl_header == NULL) {
- kfree(t);
- t = NULL;
+ t->port_header = register_sysctl(tmp_dir_path, t->vars);
+ if (t->port_header == NULL) {
+ err = -ENOENT;
+ goto unregister_devices_h;
}
+
port->sysctl_table = t;
+
+ kfree(tmp_dir_path);
return 0;
+
+unregister_devices_h:
+ unregister_sysctl_table(t->devices_header);
+
+exit_free_tmp_dir_path:
+ kfree(tmp_dir_path);
+
+exit_free_t:
+ kfree(t);
+ return err;
}
int parport_proc_unregister(struct parport *port)
@@ -514,7 +505,8 @@ int parport_proc_unregister(struct parport *port)
if (port->sysctl_table) {
struct parport_sysctl_table *t = port->sysctl_table;
port->sysctl_table = NULL;
- unregister_sysctl_table(t->sysctl_header);
+ unregister_sysctl_table(t->devices_header);
+ unregister_sysctl_table(t->port_header);
kfree(t);
}
return 0;
@@ -522,30 +514,53 @@ int parport_proc_unregister(struct parport *port)
int parport_device_proc_register(struct pardevice *device)
{
+ int bytes_written, err = 0;
struct parport_device_sysctl_table *t;
struct parport * port = device->port;
+ size_t port_name_len, device_name_len, tmp_dir_path_len;
+ char *tmp_dir_path;
t = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
if (t == NULL)
return -ENOMEM;
- t->dev_dir[0].child = t->parport_dir;
- t->parport_dir[0].child = t->port_dir;
- t->port_dir[0].procname = port->name;
- t->port_dir[0].child = t->devices_root_dir;
- t->devices_root_dir[0].child = t->device_dir;
+ port_name_len = strnlen(port->name, PARPORT_NAME_MAX_LEN);
+ device_name_len = strnlen(device->name, PATH_MAX);
+
+ /* Allocate a buffer for two paths: dev/parport/PORT/devices/DEVICE. */
+ tmp_dir_path_len = PARPORT_BASE_DEVICES_PATH_SIZE + port_name_len + device_name_len;
+ tmp_dir_path = kzalloc(tmp_dir_path_len, GFP_KERNEL);
+ if (!tmp_dir_path) {
+ err = -ENOMEM;
+ goto exit_free_t;
+ }
+
+ bytes_written = snprintf(tmp_dir_path, tmp_dir_path_len, "dev/parport/%s/devices/%s",
+ port->name, device->name);
+ if (tmp_dir_path_len <= bytes_written) {
+ err = -ENOENT;
+ goto exit_free_path;
+ }
- t->device_dir[0].procname = device->name;
- t->device_dir[0].child = t->vars;
t->vars[0].data = &device->timeslice;
- t->sysctl_header = register_sysctl_table(t->dev_dir);
+ t->sysctl_header = register_sysctl(tmp_dir_path, t->vars);
if (t->sysctl_header == NULL) {
kfree(t);
t = NULL;
}
device->sysctl_table = t;
+
+ kfree(tmp_dir_path);
return 0;
+
+exit_free_path:
+ kfree(tmp_dir_path);
+
+exit_free_t:
+ kfree(t);
+
+ return err;
}
int parport_device_proc_unregister(struct pardevice *device)
@@ -564,7 +579,7 @@ static int __init parport_default_proc_register(void)
int ret;
parport_default_sysctl_table.sysctl_header =
- register_sysctl_table(parport_default_sysctl_table.dev_dir);
+ register_sysctl("dev/parport/default", parport_default_sysctl_table.vars);
if (!parport_default_sysctl_table.sysctl_header)
return -ENOMEM;
ret = parport_bus_init();
generated by cgit (git 2.34.1) at 2024-05-26 11:52:47 +0000