From bc86cf7af2ebda88056538e8edff852ee627f76a Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Tue, 9 Oct 2012 23:26:06 -0700 Subject: mtd: nand: fix Samsung SLC NAND identification regression A combination of the following two commits caused a regression in 3.7-rc1 when identifying some Samsung NAND, so that some previously working NAND were no longer detected properly: commit e3b88bd604283ef83ae6e8f53622d5b1ffe9d43a mtd: nand: add generic READ ID length calculation functions commit e2d3a35ee427aaba99b6c68a56609ce276c51270 mtd: nand: detect Samsung K9GBG08U0A, K9GAG08U0F ID Particularly, a regression was seen on Samsung K9F2G08U0B, with the following full 8-byte READ ID string: ec da 10 95 44 00 ec da The basic problem is that Samsung manufactures both SLC and MLC NAND that use a non-standard decoding table for deriving information from their IDs. I have heuristically determined that all the chips that use the new table have ID strings which wrap around after the 6th byte. Unfortunately, I overlooked the fact that some older Samsung SLC (which use a different decoding table) have "5 byte ID strings" which also wrap around after the 6th byte. This patch re-introduces a distinction between these old and new Samsung NAND by checking that the 6th byte is non-zero, allowing both old and new Samsung NAND to be detected properly. Signed-off-by: Brian Norris Tested-by: Brian Norris Reported-by: Marek Vasut Tested-by: Marek Vasut Signed-off-by: David Woodhouse --- drivers/mtd/nand/nand_base.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index ec6841d8e956..d5ece6ea6f98 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2983,13 +2983,14 @@ static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip, /* * Field definitions are in the following datasheets: * Old style (4,5 byte ID): Samsung K9GAG08U0M (p.32) - * New style (6 byte ID): Samsung K9GAG08U0F (p.44) + * New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) * Hynix MLC (6 byte ID): Hynix H27UBG8T2B (p.22) * - * Check for ID length, cell type, and Hynix/Samsung ID to decide what - * to do. + * Check for ID length, non-zero 6th byte, cell type, and Hynix/Samsung + * ID to decide what to do. */ - if (id_len == 6 && id_data[0] == NAND_MFR_SAMSUNG) { + if (id_len == 6 && id_data[0] == NAND_MFR_SAMSUNG && + id_data[5] != 0x00) { /* Calc pagesize */ mtd->writesize = 2048 << (extid & 0x03); extid >>= 2; -- cgit v1.2.3-70-g09d2 From 5a6ea4af0907f995dc06df21a9c9ef764c7cd3bc Mon Sep 17 00:00:00 2001 From: Sachin Kamat Date: Tue, 25 Sep 2012 15:27:13 +0530 Subject: mtd: ofpart: Fix incorrect NULL check in parse_ofoldpart_partitions() The pointer returned by kzalloc should be tested for NULL to avoid potential NULL pointer dereference later. Incorrect pointer was being tested for NULL. Bug introduced by commit fbcf62a3 (mtd: physmap_of: move parse_obsolete_partitions to become separate parser). This patch fixes this bug. Cc: Dmitry Eremin-Solenikov Cc: Artem Bityutskiy Cc: stable@kernel.org Signed-off-by: Sachin Kamat Signed-off-by: David Woodhouse --- drivers/mtd/ofpart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/ofpart.c b/drivers/mtd/ofpart.c index 64be8f0848b0..d9127e2ed808 100644 --- a/drivers/mtd/ofpart.c +++ b/drivers/mtd/ofpart.c @@ -121,7 +121,7 @@ static int parse_ofoldpart_partitions(struct mtd_info *master, nr_parts = plen / sizeof(part[0]); *pparts = kzalloc(nr_parts * sizeof(*(*pparts)), GFP_KERNEL); - if (!pparts) + if (!*pparts) return -ENOMEM; names = of_get_property(dp, "partition-names", &plen); -- cgit v1.2.3-70-g09d2 From c36a7ff4578ab6294885aef5ef241aeec4cdb1f0 Mon Sep 17 00:00:00 2001 From: Jiri Engelthaler Date: Thu, 20 Sep 2012 16:49:50 +0200 Subject: mtd: slram: invalid checking of absolute end address Fixed parsing end absolute address. Signed-off-by: Jiri Engelthaler Cc: stable@vger.kernel.org Signed-off-by: Artem Bityutskiy --- drivers/mtd/devices/slram.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/devices/slram.c b/drivers/mtd/devices/slram.c index 8f52fc858e48..5a5cd2ace4a6 100644 --- a/drivers/mtd/devices/slram.c +++ b/drivers/mtd/devices/slram.c @@ -240,7 +240,7 @@ static int parse_cmdline(char *devname, char *szstart, char *szlength) if (*(szlength) != '+') { devlength = simple_strtoul(szlength, &buffer, 0); - devlength = handle_unit(devlength, buffer) - devstart; + devlength = handle_unit(devlength, buffer); if (devlength < devstart) goto err_out; -- cgit v1.2.3-70-g09d2 From 0131950ebd146b5e31508233352d6f4625af25b1 Mon Sep 17 00:00:00 2001 From: Sachin Kamat Date: Sat, 22 Sep 2012 11:42:31 +0530 Subject: mtd: onenand: Make flexonenand_set_boundary static Fixes the following sparse warning: drivers/mtd/onenand/onenand_base.c:3697:5: warning: symbol 'flexonenand_set_boundary' was not declared. Should it be static? Signed-off-by: Sachin Kamat Acked-by: Kyungmin Park Signed-off-by: Artem Bityutskiy --- drivers/mtd/onenand/onenand_base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c index 7153e0d27101..b3f41f200622 100644 --- a/drivers/mtd/onenand/onenand_base.c +++ b/drivers/mtd/onenand/onenand_base.c @@ -3694,7 +3694,7 @@ static int flexonenand_check_blocks_erased(struct mtd_info *mtd, int start, int * flexonenand_set_boundary - Writes the SLC boundary * @param mtd - mtd info structure */ -int flexonenand_set_boundary(struct mtd_info *mtd, int die, +static int flexonenand_set_boundary(struct mtd_info *mtd, int die, int boundary, int lock) { struct onenand_chip *this = mtd->priv; -- cgit v1.2.3-70-g09d2 From 5ffd3412ae5536a4c57469cb8ea31887121dcb2e Mon Sep 17 00:00:00 2001 From: Thomas Betker Date: Wed, 17 Oct 2012 22:59:30 +0200 Subject: jffs2: Fix lock acquisition order bug in jffs2_write_begin jffs2_write_begin() first acquires the page lock, then f->sem. This causes an AB-BA deadlock with jffs2_garbage_collect_live(), which first acquires f->sem, then the page lock: jffs2_garbage_collect_live mutex_lock(&f->sem) (A) jffs2_garbage_collect_dnode jffs2_gc_fetch_page read_cache_page_async do_read_cache_page lock_page(page) (B) jffs2_write_begin grab_cache_page_write_begin find_lock_page lock_page(page) (B) mutex_lock(&f->sem) (A) We fix this by restructuring jffs2_write_begin() to take f->sem before the page lock. However, we make sure that f->sem is not held when calling jffs2_reserve_space(), as this is not permitted by the locking rules. The deadlock above was observed multiple times on an SoC with a dual ARMv7 (Cortex-A9), running the long-term 3.4.11 kernel; it occurred when using scp to copy files from a host system to the ARM target system. The fix was heavily tested on the same target system. Cc: stable@vger.kernel.org Signed-off-by: Thomas Betker Acked-by: Joakim Tjernlund Signed-off-by: Artem Bityutskiy --- fs/jffs2/file.c | 39 +++++++++++++++++++++------------------ 1 file changed, 21 insertions(+), 18 deletions(-) diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c index 60ef3fb707ff..1506673c087e 100644 --- a/fs/jffs2/file.c +++ b/fs/jffs2/file.c @@ -138,33 +138,39 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping, struct page *pg; struct inode *inode = mapping->host; struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); + struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); + struct jffs2_raw_inode ri; + uint32_t alloc_len = 0; pgoff_t index = pos >> PAGE_CACHE_SHIFT; uint32_t pageofs = index << PAGE_CACHE_SHIFT; int ret = 0; + jffs2_dbg(1, "%s()\n", __func__); + + if (pageofs > inode->i_size) { + ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, + ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); + if (ret) + return ret; + } + + mutex_lock(&f->sem); pg = grab_cache_page_write_begin(mapping, index, flags); - if (!pg) + if (!pg) { + if (alloc_len) + jffs2_complete_reservation(c); + mutex_unlock(&f->sem); return -ENOMEM; + } *pagep = pg; - jffs2_dbg(1, "%s()\n", __func__); - - if (pageofs > inode->i_size) { + if (alloc_len) { /* Make new hole frag from old EOF to new page */ - struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); - struct jffs2_raw_inode ri; struct jffs2_full_dnode *fn; - uint32_t alloc_len; jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", (unsigned int)inode->i_size, pageofs); - ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, - ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); - if (ret) - goto out_page; - - mutex_lock(&f->sem); memset(&ri, 0, sizeof(ri)); ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); @@ -191,7 +197,6 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping, if (IS_ERR(fn)) { ret = PTR_ERR(fn); jffs2_complete_reservation(c); - mutex_unlock(&f->sem); goto out_page; } ret = jffs2_add_full_dnode_to_inode(c, f, fn); @@ -206,12 +211,10 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping, jffs2_mark_node_obsolete(c, fn->raw); jffs2_free_full_dnode(fn); jffs2_complete_reservation(c); - mutex_unlock(&f->sem); goto out_page; } jffs2_complete_reservation(c); inode->i_size = pageofs; - mutex_unlock(&f->sem); } /* @@ -220,18 +223,18 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping, * case of a short-copy. */ if (!PageUptodate(pg)) { - mutex_lock(&f->sem); ret = jffs2_do_readpage_nolock(inode, pg); - mutex_unlock(&f->sem); if (ret) goto out_page; } + mutex_unlock(&f->sem); jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags); return ret; out_page: unlock_page(pg); page_cache_release(pg); + mutex_unlock(&f->sem); return ret; } -- cgit v1.2.3-70-g09d2 From af451af4e0a3a4cd7536843f585c96a9b095a4e8 Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Tue, 9 Oct 2012 23:26:06 -0700 Subject: mtd: nand: fix Samsung SLC NAND identification regression A combination of the following two commits caused a regression in 3.7-rc1 when identifying some Samsung NAND, so that some previously working NAND were no longer detected properly: commit e3b88bd604283ef83ae6e8f53622d5b1ffe9d43a mtd: nand: add generic READ ID length calculation functions commit e2d3a35ee427aaba99b6c68a56609ce276c51270 mtd: nand: detect Samsung K9GBG08U0A, K9GAG08U0F ID Particularly, a regression was seen on Samsung K9F2G08U0B, with the following full 8-byte READ ID string: ec da 10 95 44 00 ec da The basic problem is that Samsung manufactures both SLC and MLC NAND that use a non-standard decoding table for deriving information from their IDs. I have heuristically determined that all the chips that use the new table have ID strings which wrap around after the 6th byte. Unfortunately, I overlooked the fact that some older Samsung SLC (which use a different decoding table) have "5 byte ID strings" which also wrap around after the 6th byte. This patch re-introduces a distinction between these old and new Samsung NAND by checking that the 6th byte is non-zero, allowing both old and new Samsung NAND to be detected properly. Signed-off-by: Brian Norris Tested-by: Brian Norris Reported-by: Marek Vasut Tested-by: Marek Vasut Signed-off-by: Artem Bityutskiy --- drivers/mtd/nand/nand_base.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index ec6841d8e956..d5ece6ea6f98 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2983,13 +2983,14 @@ static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip, /* * Field definitions are in the following datasheets: * Old style (4,5 byte ID): Samsung K9GAG08U0M (p.32) - * New style (6 byte ID): Samsung K9GAG08U0F (p.44) + * New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) * Hynix MLC (6 byte ID): Hynix H27UBG8T2B (p.22) * - * Check for ID length, cell type, and Hynix/Samsung ID to decide what - * to do. + * Check for ID length, non-zero 6th byte, cell type, and Hynix/Samsung + * ID to decide what to do. */ - if (id_len == 6 && id_data[0] == NAND_MFR_SAMSUNG) { + if (id_len == 6 && id_data[0] == NAND_MFR_SAMSUNG && + id_data[5] != 0x00) { /* Calc pagesize */ mtd->writesize = 2048 << (extid & 0x03); extid >>= 2; -- cgit v1.2.3-70-g09d2 From 6924d99fcdf1a688538a3cdebd1f135c22eec191 Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Wed, 14 Nov 2012 21:46:30 -0800 Subject: mtd: nand: fix Samsung SLC detection regression This patch fixes errors seen in identifying old Samsung SLC, due to the following commits: commit e2d3a35ee427aaba99b6c68a56609ce276c51270 mtd: nand: detect Samsung K9GBG08U0A, K9GAG08U0F ID commit e3b88bd604283ef83ae6e8f53622d5b1ffe9d43a mtd: nand: add generic READ ID length calculation functions Some Samsung NAND with "5-byte" ID really appear to have 6-byte IDs, with wraparound like: Samsung K9K8G08U0D ec d3 51 95 58 ec ec d3 Samsung K9F1G08U0C ec f1 00 95 40 ec ec f1 Samsung K9F2G08U0B ec da 10 95 44 00 ec da This bad wraparound makes it hard to reliably detect the difference between Samsung SLC with 5-byte ID and Samsung SLC with 6-byte ID. The fix is to, for now, only use the new Samsung table for MLC. We cannot support the new SLC (K9FAG08U0M) until Samsung gives better ID decode information. Note that this applies in addition to the previous regression fix: commit bc86cf7af2ebda88056538e8edff852ee627f76a mtd: nand: fix Samsung SLC NAND identification regression Together, these patches completely restore the previous detection behavior so that we cannot see any more regressions in Samsung SLC NAND (finger crossed). With luck, I can get a hold of a Samsung representative and stop having to cross my fingers eventually. Reported-by: Sylwester Nawrocki Tested-by: Sylwester Nawrocki Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy --- drivers/mtd/nand/nand_base.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index d5ece6ea6f98..1a03b7f673ce 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2990,6 +2990,7 @@ static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip, * ID to decide what to do. */ if (id_len == 6 && id_data[0] == NAND_MFR_SAMSUNG && + (chip->cellinfo & NAND_CI_CELLTYPE_MSK) && id_data[5] != 0x00) { /* Calc pagesize */ mtd->writesize = 2048 << (extid & 0x03); -- cgit v1.2.3-70-g09d2