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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-05 11:08:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-05 11:08:17 -0700
commitbafb0762cb6a906eb4105cccfb3bcd90be7f40d2 (patch)
tree14ecb87c33bcf909e5b95c27cd694ded4ac1478c /fs
parent44b1671fae88ce95b8c7b53acbc6ba71ca67db00 (diff)
parent3a6430ce462172caac7c73f4afd550ab0f105737 (diff)
downloadlinux-bafb0762cb6a906eb4105cccfb3bcd90be7f40d2.tar.bz2
Merge tag 'char-misc-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver updates from Greg KH: "Here is the big char/misc driver update for 4.14-rc1. Lots of different stuff in here, it's been an active development cycle for some reason. Highlights are: - updated binder driver, this brings binder up to date with what shipped in the Android O release, plus some more changes that happened since then that are in the Android development trees. - coresight updates and fixes - mux driver file renames to be a bit "nicer" - intel_th driver updates - normal set of hyper-v updates and changes - small fpga subsystem and driver updates - lots of const code changes all over the driver trees - extcon driver updates - fmc driver subsystem upadates - w1 subsystem minor reworks and new features and drivers added - spmi driver updates Plus a smattering of other minor driver updates and fixes. All of these have been in linux-next with no reported issues for a while" * tag 'char-misc-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (244 commits) ANDROID: binder: don't queue async transactions to thread. ANDROID: binder: don't enqueue death notifications to thread todo. ANDROID: binder: Don't BUG_ON(!spin_is_locked()). ANDROID: binder: Add BINDER_GET_NODE_DEBUG_INFO ioctl ANDROID: binder: push new transactions to waiting threads. ANDROID: binder: remove proc waitqueue android: binder: Add page usage in binder stats android: binder: fixup crash introduced by moving buffer hdr drivers: w1: add hwmon temp support for w1_therm drivers: w1: refactor w1_slave_show to make the temp reading functionality separate drivers: w1: add hwmon support structures eeprom: idt_89hpesx: Support both ACPI and OF probing mcb: Fix an error handling path in 'chameleon_parse_cells()' MCB: add support for SC31 to mcb-lpc mux: make device_type const char: virtio: constify attribute_group structures. Documentation/ABI: document the nvmem sysfs files lkdtm: fix spelling mistake: "incremeted" -> "incremented" perf: cs-etm: Fix ETMv4 CONFIGR entry in perf.data file nvmem: include linux/err.h from header ...
Diffstat (limited to 'fs')
-rw-r--r--fs/char_dev.c58
-rw-r--r--fs/proc/devices.c8
2 files changed, 45 insertions, 21 deletions
diff --git a/fs/char_dev.c b/fs/char_dev.c
index fb8507f521b2..ebcc8fb3fa66 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -28,6 +28,8 @@ static struct kobj_map *cdev_map;
static DEFINE_MUTEX(chrdevs_lock);
+#define CHRDEV_MAJOR_HASH_SIZE 255
+
static struct char_device_struct {
struct char_device_struct *next;
unsigned int major;
@@ -49,16 +51,39 @@ void chrdev_show(struct seq_file *f, off_t offset)
{
struct char_device_struct *cd;
- if (offset < CHRDEV_MAJOR_HASH_SIZE) {
- mutex_lock(&chrdevs_lock);
- for (cd = chrdevs[offset]; cd; cd = cd->next)
+ mutex_lock(&chrdevs_lock);
+ for (cd = chrdevs[major_to_index(offset)]; cd; cd = cd->next) {
+ if (cd->major == offset)
seq_printf(f, "%3d %s\n", cd->major, cd->name);
- mutex_unlock(&chrdevs_lock);
}
+ mutex_unlock(&chrdevs_lock);
}
#endif /* CONFIG_PROC_FS */
+static int find_dynamic_major(void)
+{
+ int i;
+ struct char_device_struct *cd;
+
+ for (i = ARRAY_SIZE(chrdevs)-1; i > CHRDEV_MAJOR_DYN_END; i--) {
+ if (chrdevs[i] == NULL)
+ return i;
+ }
+
+ for (i = CHRDEV_MAJOR_DYN_EXT_START;
+ i > CHRDEV_MAJOR_DYN_EXT_END; i--) {
+ for (cd = chrdevs[major_to_index(i)]; cd; cd = cd->next)
+ if (cd->major == i)
+ break;
+
+ if (cd == NULL || cd->major != i)
+ return i;
+ }
+
+ return -EBUSY;
+}
+
/*
* Register a single major with a specified minor range.
*
@@ -84,22 +109,21 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
mutex_lock(&chrdevs_lock);
- /* temporary */
if (major == 0) {
- for (i = ARRAY_SIZE(chrdevs)-1; i > 0; i--) {
- if (chrdevs[i] == NULL)
- break;
- }
-
- if (i < CHRDEV_MAJOR_DYN_END)
- pr_warn("CHRDEV \"%s\" major number %d goes below the dynamic allocation range\n",
- name, i);
-
- if (i == 0) {
- ret = -EBUSY;
+ ret = find_dynamic_major();
+ if (ret < 0) {
+ pr_err("CHRDEV \"%s\" dynamic allocation region is full\n",
+ name);
goto out;
}
- major = i;
+ major = ret;
+ }
+
+ if (major >= CHRDEV_MAJOR_MAX) {
+ pr_err("CHRDEV \"%s\" major requested (%d) is greater than the maximum (%d)\n",
+ name, major, CHRDEV_MAJOR_MAX);
+ ret = -EINVAL;
+ goto out;
}
cd->major = major;
diff --git a/fs/proc/devices.c b/fs/proc/devices.c
index 50493edc30e5..e5709343feb7 100644
--- a/fs/proc/devices.c
+++ b/fs/proc/devices.c
@@ -7,14 +7,14 @@ static int devinfo_show(struct seq_file *f, void *v)
{
int i = *(loff_t *) v;
- if (i < CHRDEV_MAJOR_HASH_SIZE) {
+ if (i < CHRDEV_MAJOR_MAX) {
if (i == 0)
seq_puts(f, "Character devices:\n");
chrdev_show(f, i);
}
#ifdef CONFIG_BLOCK
else {
- i -= CHRDEV_MAJOR_HASH_SIZE;
+ i -= CHRDEV_MAJOR_MAX;
if (i == 0)
seq_puts(f, "\nBlock devices:\n");
blkdev_show(f, i);
@@ -25,7 +25,7 @@ static int devinfo_show(struct seq_file *f, void *v)
static void *devinfo_start(struct seq_file *f, loff_t *pos)
{
- if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
+ if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))
return pos;
return NULL;
}
@@ -33,7 +33,7 @@ static void *devinfo_start(struct seq_file *f, loff_t *pos)
static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
{
(*pos)++;
- if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
+ if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))
return NULL;
return pos;
}