From 287980e49ffc0f6d911601e7e352a812ed27768e Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 27 May 2016 23:23:25 +0200 Subject: remove lots of IS_ERR_VALUE abuses Most users of IS_ERR_VALUE() in the kernel are wrong, as they pass an 'int' into a function that takes an 'unsigned long' argument. This happens to work because the type is sign-extended on 64-bit architectures before it gets converted into an unsigned type. However, anything that passes an 'unsigned short' or 'unsigned int' argument into IS_ERR_VALUE() is guaranteed to be broken, as are 8-bit integers and types that are wider than 'unsigned long'. Andrzej Hajda has already fixed a lot of the worst abusers that were causing actual bugs, but it would be nice to prevent any users that are not passing 'unsigned long' arguments. This patch changes all users of IS_ERR_VALUE() that I could find on 32-bit ARM randconfig builds and x86 allmodconfig. For the moment, this doesn't change the definition of IS_ERR_VALUE() because there are probably still architecture specific users elsewhere. Almost all the warnings I got are for files that are better off using 'if (err)' or 'if (err < 0)'. The only legitimate user I could find that we get a warning for is the (32-bit only) freescale fman driver, so I did not remove the IS_ERR_VALUE() there but changed the type to 'unsigned long'. For 9pfs, I just worked around one user whose calling conventions are so obscure that I did not dare change the behavior. I was using this definition for testing: #define IS_ERR_VALUE(x) ((unsigned long*)NULL == (typeof (x)*)NULL && \ unlikely((unsigned long long)(x) >= (unsigned long long)(typeof(x))-MAX_ERRNO)) which ends up making all 16-bit or wider types work correctly with the most plausible interpretation of what IS_ERR_VALUE() was supposed to return according to its users, but also causes a compile-time warning for any users that do not pass an 'unsigned long' argument. I suggested this approach earlier this year, but back then we ended up deciding to just fix the users that are obviously broken. After the initial warning that caused me to get involved in the discussion (fs/gfs2/dir.c) showed up again in the mainline kernel, Linus asked me to send the whole thing again. [ Updated the 9p parts as per Al Viro - Linus ] Signed-off-by: Arnd Bergmann Cc: Andrzej Hajda Cc: Andrew Morton Link: https://lkml.org/lkml/2016/1/7/363 Link: https://lkml.org/lkml/2016/5/27/486 Acked-by: Srinivas Kandagatla # For nvmem part Signed-off-by: Linus Torvalds --- drivers/nvmem/core.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) (limited to 'drivers/nvmem') diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index bb4ea123547f..965911d9b36a 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -113,7 +113,7 @@ static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj, rc = nvmem_reg_read(nvmem, pos, buf, count); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; return count; @@ -147,7 +147,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, rc = nvmem_reg_write(nvmem, pos, buf, count); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; return count; @@ -366,7 +366,7 @@ static int nvmem_add_cells(struct nvmem_device *nvmem, } rval = nvmem_cell_info_to_nvmem_cell(nvmem, &info[i], cells[i]); - if (IS_ERR_VALUE(rval)) { + if (rval) { kfree(cells[i]); goto err; } @@ -963,7 +963,7 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem, rc = nvmem_reg_read(nvmem, cell->offset, buf, cell->bytes); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; /* shift bits in-place */ @@ -998,7 +998,7 @@ void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len) return ERR_PTR(-ENOMEM); rc = __nvmem_cell_read(nvmem, cell, buf, len); - if (IS_ERR_VALUE(rc)) { + if (rc) { kfree(buf); return ERR_PTR(rc); } @@ -1083,7 +1083,7 @@ int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len) if (cell->bit_offset || cell->nbits) kfree(buf); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; return len; @@ -1111,11 +1111,11 @@ ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem, return -EINVAL; rc = nvmem_cell_info_to_nvmem_cell(nvmem, info, &cell); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; rc = __nvmem_cell_read(nvmem, &cell, buf, &len); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; return len; @@ -1141,7 +1141,7 @@ int nvmem_device_cell_write(struct nvmem_device *nvmem, return -EINVAL; rc = nvmem_cell_info_to_nvmem_cell(nvmem, info, &cell); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; return nvmem_cell_write(&cell, buf, cell.bytes); @@ -1170,7 +1170,7 @@ int nvmem_device_read(struct nvmem_device *nvmem, rc = nvmem_reg_read(nvmem, offset, buf, bytes); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; return bytes; @@ -1198,7 +1198,7 @@ int nvmem_device_write(struct nvmem_device *nvmem, rc = nvmem_reg_write(nvmem, offset, buf, bytes); - if (IS_ERR_VALUE(rc)) + if (rc) return rc; -- cgit v1.2.3