[PATCH v5 3/4] mtd: core: protect access to MTD devices while in suspend

From: Sean Nyekjaer
Date: Tue Nov 02 2021 - 07:02:33 EST

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Prevent MTD access while in a suspended state. Also
prevent suspending a device which is still currently in use.

Commit 013e6292aaf5 ("mtd: rawnand: Simplify the locking") allows the
rawnand layer to return errors rather than waiting in a blocking wait.

Tested on a iMX6ULL.

Suggested-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Signed-off-by: Sean Nyekjaer <sean@xxxxxxxxxx>
---
drivers/mtd/mtdcore.c | 115 +++++++++++++++++++++++++++++++++++-----
include/linux/mtd/mtd.h | 81 +++++++++++++++++++++++-----
2 files changed, 169 insertions(+), 27 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 153229198947..f02b602b3fa9 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -777,6 +777,8 @@ 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);
+ init_waitqueue_head(&mtd->master.resume_wq);
+ init_rwsem(&mtd->master.suspend_lock);
}

static ssize_t mtd_otp_size(struct mtd_info *mtd, bool is_user)
@@ -1267,7 +1269,9 @@ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)

adjinstr.addr += mst_ofs;

+ mtd_start_access(master);
ret = master->_erase(master, &adjinstr);
+ mtd_end_access(master);

if (adjinstr.fail_addr != MTD_FAIL_ADDR_UNKNOWN) {
instr->fail_addr = adjinstr.fail_addr - mst_ofs;
@@ -1289,6 +1293,7 @@ int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
void **virt, resource_size_t *phys)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

*retlen = 0;
*virt = NULL;
@@ -1301,8 +1306,12 @@ int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
if (!len)
return 0;

+ mtd_start_access(master);
from = mtd_get_master_ofs(mtd, from);
- return master->_point(master, from, len, retlen, virt, phys);
+ ret = master->_point(master, from, len, retlen, virt, phys);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_point);

@@ -1310,6 +1319,7 @@ EXPORT_SYMBOL_GPL(mtd_point);
int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_unpoint)
return -EOPNOTSUPP;
@@ -1317,7 +1327,12 @@ int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
return -EINVAL;
if (!len)
return 0;
- return master->_unpoint(master, mtd_get_master_ofs(mtd, from), len);
+
+ mtd_start_access(master);
+ ret = master->_unpoint(master, mtd_get_master_ofs(mtd, from), len);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_unpoint);

@@ -1372,6 +1387,7 @@ int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
};
int ret;

+ /* mtd_read_oob_std handles mtd access protection */
ret = mtd_read_oob(mtd, from, &ops);
*retlen = ops.retlen;

@@ -1388,6 +1404,7 @@ int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
};
int ret;

+ /* mtd_write_oob_std handles mtd access protection */
ret = mtd_write_oob(mtd, to, &ops);
*retlen = ops.retlen;

@@ -1464,11 +1481,13 @@ static int mtd_read_oob_std(struct mtd_info *mtd, loff_t from,
int ret;

from = mtd_get_master_ofs(mtd, from);
+ mtd_start_access(master);
if (master->_read_oob)
ret = master->_read_oob(master, from, ops);
else
ret = master->_read(master, from, ops->len, &ops->retlen,
ops->datbuf);
+ mtd_end_access(master);

return ret;
}
@@ -1480,11 +1499,13 @@ static int mtd_write_oob_std(struct mtd_info *mtd, loff_t to,
int ret;

to = mtd_get_master_ofs(mtd, to);
+ mtd_start_access(master);
if (master->_write_oob)
ret = master->_write_oob(master, to, ops);
else
ret = master->_write(master, to, ops->len, &ops->retlen,
ops->datbuf);
+ mtd_end_access(master);

return ret;
}
@@ -1992,12 +2013,18 @@ int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
struct otp_info *buf)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_get_fact_prot_info)
return -EOPNOTSUPP;
if (!len)
return 0;
- return master->_get_fact_prot_info(master, len, retlen, buf);
+
+ mtd_start_access(master);
+ ret = master->_get_fact_prot_info(master, len, retlen, buf);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info);

@@ -2005,13 +2032,19 @@ int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

*retlen = 0;
if (!master->_read_fact_prot_reg)
return -EOPNOTSUPP;
if (!len)
return 0;
- return master->_read_fact_prot_reg(master, from, len, retlen, buf);
+
+ mtd_start_access(master);
+ ret = master->_read_fact_prot_reg(master, from, len, retlen, buf);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg);

@@ -2019,12 +2052,18 @@ int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
struct otp_info *buf)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_get_user_prot_info)
return -EOPNOTSUPP;
if (!len)
return 0;
- return master->_get_user_prot_info(master, len, retlen, buf);
+
+ mtd_start_access(master);
+ ret = master->_get_user_prot_info(master, len, retlen, buf);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_get_user_prot_info);

@@ -2032,13 +2071,19 @@ int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

*retlen = 0;
if (!master->_read_user_prot_reg)
return -EOPNOTSUPP;
if (!len)
return 0;
- return master->_read_user_prot_reg(master, from, len, retlen, buf);
+
+ mtd_start_access(master);
+ ret = master->_read_user_prot_reg(master, from, len, retlen, buf);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg);

@@ -2053,7 +2098,11 @@ int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
return -EOPNOTSUPP;
if (!len)
return 0;
+
+ mtd_start_access(master);
ret = master->_write_user_prot_reg(master, to, len, retlen, buf);
+ mtd_end_access(master);
+
if (ret)
return ret;

@@ -2068,24 +2117,36 @@ EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg);
int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_lock_user_prot_reg)
return -EOPNOTSUPP;
if (!len)
return 0;
- return master->_lock_user_prot_reg(master, from, len);
+
+ mtd_start_access(master);
+ ret = master->_lock_user_prot_reg(master, from, len);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg);

int mtd_erase_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_erase_user_prot_reg)
return -EOPNOTSUPP;
if (!len)
return 0;
- return master->_erase_user_prot_reg(master, from, len);
+
+ mtd_start_access(master);
+ ret = master->_erase_user_prot_reg(master, from, len);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_erase_user_prot_reg);

@@ -2093,6 +2154,7 @@ EXPORT_SYMBOL_GPL(mtd_erase_user_prot_reg);
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_lock)
return -EOPNOTSUPP;
@@ -2106,13 +2168,18 @@ int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize;
}

- return master->_lock(master, mtd_get_master_ofs(mtd, ofs), len);
+ mtd_start_access(master);
+ ret = master->_lock(master, mtd_get_master_ofs(mtd, ofs), len);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_lock);

int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_unlock)
return -EOPNOTSUPP;
@@ -2126,13 +2193,18 @@ int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize;
}

- return master->_unlock(master, mtd_get_master_ofs(mtd, ofs), len);
+ mtd_start_access(master);
+ ret = master->_unlock(master, mtd_get_master_ofs(mtd, ofs), len);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_unlock);

int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_is_locked)
return -EOPNOTSUPP;
@@ -2146,13 +2218,18 @@ int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize;
}

- return master->_is_locked(master, mtd_get_master_ofs(mtd, ofs), len);
+ mtd_start_access(master);
+ ret = master->_is_locked(master, mtd_get_master_ofs(mtd, ofs), len);
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_is_locked);

int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (ofs < 0 || ofs >= mtd->size)
return -EINVAL;
@@ -2162,13 +2239,18 @@ int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs)
if (mtd->flags & MTD_SLC_ON_MLC_EMULATION)
ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;

- return master->_block_isreserved(master, mtd_get_master_ofs(mtd, ofs));
+ mtd_start_access(master);
+ ret = master->_block_isreserved(master, mtd_get_master_ofs(mtd, ofs));
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_block_isreserved);

int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (ofs < 0 || ofs >= mtd->size)
return -EINVAL;
@@ -2178,7 +2260,11 @@ int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
if (mtd->flags & MTD_SLC_ON_MLC_EMULATION)
ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;

- return master->_block_isbad(master, mtd_get_master_ofs(mtd, ofs));
+ mtd_start_access(master);
+ ret = master->_block_isbad(master, mtd_get_master_ofs(mtd, ofs));
+ mtd_end_access(master);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(mtd_block_isbad);

@@ -2197,7 +2283,10 @@ int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
if (mtd->flags & MTD_SLC_ON_MLC_EMULATION)
ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize;

+ mtd_start_access(master);
ret = master->_block_markbad(master, mtd_get_master_ofs(mtd, ofs));
+ mtd_end_access(master);
+
if (ret)
return ret;

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 88227044fc86..b074106e2d8e 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -231,6 +231,8 @@ struct mtd_master {
struct mutex partitions_lock;
struct mutex chrdev_lock;
unsigned int suspended : 1;
+ wait_queue_head_t resume_wq;
+ struct rw_semaphore suspend_lock;
};

struct mtd_info {
@@ -476,10 +478,47 @@ static inline u32 mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
}

+static inline void mtd_start_access(struct mtd_info *master)
+{
+ WARN_ON_ONCE(master != mtd_get_master(master));
+
+ /*
+ * Don't take the suspend_lock on devices that don't
+ * implement the suspend hook. Otherwise, lockdep will
+ * complain about nested locks when trying to suspend MTD
+ * partitions or MTD devices created by gluebi which are
+ * backed by real devices.
+ */
+ if (!master->_suspend)
+ return;
+
+ /*
+ * Wait until the device is resumed. Should we have a
+ * non-blocking mode here?
+ */
+ while (1) {
+ down_read(&master->master.suspend_lock);
+ if (!master->master.suspended)
+ return;
+
+ up_read(&master->master.suspend_lock);
+ wait_event(master->master.resume_wq, !master->master.suspended);
+ }
+}
+
+static inline void mtd_end_access(struct mtd_info *master)
+{
+ if (!master->_suspend)
+ return;
+
+ up_read(&master->master.suspend_lock);
+}
+
static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
loff_t ofs, size_t len)
{
struct mtd_info *master = mtd_get_master(mtd);
+ int ret;

if (!master->_max_bad_blocks)
return -ENOTSUPP;
@@ -487,8 +526,12 @@ static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
if (mtd->size < (len + ofs) || ofs < 0)
return -EINVAL;

- return master->_max_bad_blocks(master, mtd_get_master_ofs(mtd, ofs),
- len);
+ mtd_start_access(master);
+ ret = master->_max_bad_blocks(master, mtd_get_master_ofs(mtd, ofs),
+ len);
+ mtd_end_access(master);
+
+ return ret;
}

int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
@@ -546,30 +589,40 @@ int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
static inline int mtd_suspend(struct mtd_info *mtd)
{
struct mtd_info *master = mtd_get_master(mtd);
- int ret;
-
- if (master->master.suspended)
- return 0;
+ int ret = 0;

- ret = master->_suspend ? master->_suspend(master) : 0;
- if (ret)
+ if (!master->_suspend)
return ret;

- master->master.suspended = 1;
- return 0;
+ down_write(&master->master.suspend_lock);
+ if (!master->master.suspended) {
+ ret = master->_suspend(master);
+ if (!ret)
+ master->master.suspended = 1;
+ }
+ up_write(&master->master.suspend_lock);
+
+ return ret;
}

static inline void mtd_resume(struct mtd_info *mtd)
{
struct mtd_info *master = mtd_get_master(mtd);

- if (!master->master.suspended)
+ if (!master->_suspend)
return;

- if (master->_resume)
- master->_resume(master);
+ down_write(&master->master.suspend_lock);
+ if (master->master.suspended) {
+ if (master->_resume)
+ master->_resume(master);
+
+ master->master.suspended = 0;

- master->master.suspended = 0;
+ /* The MTD dev has been resumed, wake up all waiters. */
+ wake_up_all(&master->master.resume_wq);
+ }
+ up_write(&master->master.suspend_lock);
}

static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
--
2.33.0

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