At the moment, most of the "store" functions that handle input from the
userspace via the sysfs objects commonly returns the -EINVAL error code
should the value provided fail validation and/or type conversion. This
error code is a clear message to the userspace that the provided value
is not a valid input.
However, some of the "show" functions return the error code as-is as
returned from the helper functions used to parse the input value, and in
which case the error code can be either -EINVAL or -ERANGE. The former
would often be a return from the kstrtobool() function and the latter
will most likely be originating from other kstr*() functions family such
as e.g., kstrtou8(), kstrtou32(), etc.
The -EINVAL is commonly returned as the error code to indicate that the
value provided is invalid, and the -ERANGE code is not very useful in
the userspace, thus normalize the return error code to be -EINVAL for
when the validation and/or type conversion fails.
Signed-off-by: Krzysztof Wilczyński <kw@xxxxxxxxx>
---
drivers/pci/endpoint/functions/pci-epf-ntb.c | 18 ++++------
drivers/pci/endpoint/pci-ep-cfs.c | 35 +++++++-------------
drivers/pci/iov.c | 10 +++---
3 files changed, 22 insertions(+), 41 deletions(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-ntb.c b/drivers/pci/endpoint/functions/pci-epf-ntb.c
index bce274d02dcf..c5a9cfa4c4a4 100644
--- a/drivers/pci/endpoint/functions/pci-epf-ntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-ntb.c
@@ -1928,11 +1928,9 @@ static ssize_t epf_ntb_##_name##_store(struct config_item *item, \
struct config_group *group = to_config_group(item); \
struct epf_ntb *ntb = to_epf_ntb(group); \
u32 val; \
- int ret; \
\
- ret = kstrtou32(page, 0, &val); \
- if (ret) \
- return ret; \
+ if (kstrtou32(page, 0, &val) < 0) \
+ return -EINVAL; \
\
ntb->_name = val; \
\
@@ -1961,11 +1959,9 @@ static ssize_t epf_ntb_##_name##_store(struct config_item *item, \
struct device *dev = &ntb->epf->dev; \
int win_no; \
u64 val; \
- int ret; \
\
- ret = kstrtou64(page, 0, &val); \
- if (ret) \
- return ret; \
+ if (kstrtou64(page, 0, &val) < 0) \
+ return -EINVAL; \
\
if (sscanf(#_name, "mw%d", &win_no) != 1) \
return -EINVAL; \
@@ -1986,11 +1982,9 @@ static ssize_t epf_ntb_num_mws_store(struct config_item *item,
struct config_group *group = to_config_group(item);
struct epf_ntb *ntb = to_epf_ntb(group);
u32 val;
- int ret;
- ret = kstrtou32(page, 0, &val);
- if (ret)
- return ret;
+ if (kstrtou32(page, 0, &val) < 0)
+ return -EINVAL;
if (val > MAX_MW)
return -EINVAL;
diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index f3a8b833b479..c77459048ef7 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -175,9 +175,8 @@ static ssize_t pci_epc_start_store(struct config_item *item, const char *page,
epc = epc_group->epc;
- ret = kstrtobool(page, &start);
- if (ret)
- return ret;
+ if (kstrtobool(page, &start) < 0)
+ return -EINVAL;
if (!start) {
pci_epc_stop(epc);
@@ -329,13 +328,11 @@ static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u32 val; \
- int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
- ret = kstrtou32(page, 0, &val); \
- if (ret) \
- return ret; \
+ if (kstrtou32(page, 0, &val) < 0) \
+ return -EINVAL; \
epf->header->_name = val; \
return len; \
}
@@ -345,13 +342,11 @@ static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u16 val; \
- int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
- ret = kstrtou16(page, 0, &val); \
- if (ret) \
- return ret; \
+ if (kstrtou16(page, 0, &val) < 0) \
+ return -EINVAL; \
epf->header->_name = val; \
return len; \
}
@@ -361,13 +356,11 @@ static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u8 val; \
- int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
- ret = kstrtou8(page, 0, &val); \
- if (ret) \
- return ret; \
+ if (kstrtou8(page, 0, &val) < 0) \
+ return -EINVAL; \
epf->header->_name = val; \
return len; \
}
@@ -376,11 +369,9 @@ static ssize_t pci_epf_msi_interrupts_store(struct config_item *item,
const char *page, size_t len)
{
u8 val;
- int ret;
- ret = kstrtou8(page, 0, &val);
- if (ret)
- return ret;
+ if (kstrtou8(page, 0, &val) < 0)
+ return -EINVAL;
to_pci_epf_group(item)->epf->msi_interrupts = val;
@@ -398,11 +389,9 @@ static ssize_t pci_epf_msix_interrupts_store(struct config_item *item,
const char *page, size_t len)
{
u16 val;
- int ret;
- ret = kstrtou16(page, 0, &val);
- if (ret)
- return ret;
+ if (kstrtou16(page, 0, &val) < 0)
+ return -EINVAL;
to_pci_epf_group(item)->epf->msix_interrupts = val;
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index afc06e6ce115..aa775c7b46fd 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -185,9 +185,8 @@ static ssize_t sriov_vf_msix_count_store(struct device *dev,
struct pci_dev *pdev = pci_physfn(vf_dev);
int val, ret;
- ret = kstrtoint(buf, 0, &val);
- if (ret)
- return ret;
+ if (kstrtoint(buf, 0, &val) < 0)
+ return -EINVAL;
if (val < 0)
return -EINVAL;
@@ -379,9 +378,8 @@ static ssize_t sriov_numvfs_store(struct device *dev,
int ret;
u16 num_vfs;
- ret = kstrtou16(buf, 0, &num_vfs);
- if (ret < 0)
- return ret;
+ if (kstrtou16(buf, 0, &num_vfs) < 0)
+ return -EINVAL;
if (num_vfs > pci_sriov_get_totalvfs(pdev))
return -ERANGE;
--
2.32.0
