diff options
| author | Alexander Sverdlin <alexander.sverdlin@nokia.com> | 2021-02-17 22:18:45 +0100 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2021-03-11 09:37:49 +0100 |
| commit | 1ad55288829c78e85bfe7d0c86d75415adf5f305 (patch) | |
| tree | e68905b4eb37887cb6902ea671db393be2034f41 | |
| parent | ecd400ce5f97e03aed6bef9bc4efb1befdbf779b (diff) | |
| download | linux-1ad55288829c78e85bfe7d0c86d75415adf5f305.tar.bz2 | |
mtd: char: Get rid of Big MTD Lock
Get rid of central chrdev MTD lock, which prevents simultaneous operations
on completely independent physical MTD chips. Replace it with newly
introduced per-master mutex.
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210217211845.43364-2-alexander.sverdlin@nokia.com
| -rw-r--r-- | drivers/mtd/mtdchar.c | 14 | ||||
| -rw-r--r-- | drivers/mtd/mtdcore.c | 1 | ||||
| -rw-r--r-- | include/linux/mtd/mtd.h | 1 |
3 files changed, 10 insertions, 6 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index f31390d186ca..57c4a2f0b703 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -27,8 +27,6 @@ #include "mtdcore.h" -static DEFINE_MUTEX(mtd_mutex); - /* * Data structure to hold the pointer to the mtd device as well * as mode information of various use cases. @@ -1020,11 +1018,14 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) { + struct mtd_file_info *mfi = file->private_data; + struct mtd_info *mtd = mfi->mtd; + struct mtd_info *master = mtd_get_master(mtd); int ret; - mutex_lock(&mtd_mutex); + mutex_lock(&master->master.chrdev_lock); ret = mtdchar_ioctl(file, cmd, arg); - mutex_unlock(&mtd_mutex); + mutex_unlock(&master->master.chrdev_lock); return ret; } @@ -1045,10 +1046,11 @@ static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, { struct mtd_file_info *mfi = file->private_data; struct mtd_info *mtd = mfi->mtd; + struct mtd_info *master = mtd_get_master(mtd); void __user *argp = compat_ptr(arg); int ret = 0; - mutex_lock(&mtd_mutex); + mutex_lock(&master->master.chrdev_lock); switch (cmd) { case MEMWRITEOOB32: @@ -1111,7 +1113,7 @@ static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); } - mutex_unlock(&mtd_mutex); + mutex_unlock(&master->master.chrdev_lock); return ret; } diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 2d6423d89a17..0b095975895e 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -773,6 +773,7 @@ static void mtd_set_dev_defaults(struct mtd_info *mtd) INIT_LIST_HEAD(&mtd->partitions); mutex_init(&mtd->master.partitions_lock); + mutex_init(&mtd->master.chrdev_lock); } /** diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 157357ec1441..ceabc2cae8a4 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -229,6 +229,7 @@ struct mtd_part { */ struct mtd_master { struct mutex partitions_lock; + struct mutex chrdev_lock; unsigned int suspended : 1; }; |