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firewire fixes for 6.9-rc1 

The previous PR includes some regressions in some device attributes exposed to
 sysfs. They are fixed now.
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Merge tag 'firewire-fixes-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394

Pull firewire fixes Takashi Sakamoto:
 "The previous pull includes some regressions in some device attributes
  exposed to sysfs. They are fixed now"

* tag 'firewire-fixes-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
  firewire: core: add memo about the caller of show functions for device attributes
  Revert "firewire: Kill unnecessary buf check in device_attribute.show"
This commit is contained in:
Linus Torvalds 2024-03-21 14:13:18 -07:00
parent 241590e5a1 bfb1ad3c6a
commit 88d92fb1c0
1 changed files with 14 additions and 4 deletions
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18
drivers/firewire/core-device.c
View File

@ -322,7 +322,8 @@ static ssize_t show_immediate(struct device *dev,
if (value < 0)
return -ENOENT;
return sysfs_emit(buf, "0x%06x\n", value);
// Note that this function is also called by init_fw_attribute_group() with NULL pointer.
return buf ? sysfs_emit(buf, "0x%06x\n", value) : 0;
}
#define IMMEDIATE_ATTR(name, key) \
@ -334,6 +335,8 @@ static ssize_t show_text_leaf(struct device *dev,
struct config_rom_attribute *attr =
container_of(dattr, struct config_rom_attribute, attr);
const u32 *directories[] = {NULL, NULL};
size_t bufsize;
char dummy_buf[2];
int i, ret = -ENOENT;
down_read(&fw_device_rwsem);
@ -355,9 +358,16 @@ static ssize_t show_text_leaf(struct device *dev,
}
}
// Note that this function is also called by init_fw_attribute_group() with NULL pointer.
if (buf) {
bufsize = PAGE_SIZE - 1;
} else {
buf = dummy_buf;
bufsize = 1;
}
for (i = 0; i < ARRAY_SIZE(directories) && !!directories[i]; ++i) {
int result = fw_csr_string(directories[i], attr->key, buf,
PAGE_SIZE - 1);
int result = fw_csr_string(directories[i], attr->key, buf, bufsize);
// Detected.
if (result >= 0) {
ret = result;
@ -366,7 +376,7 @@ static ssize_t show_text_leaf(struct device *dev,
// in the root directory follows to the directory entry for vendor ID
// instead of the immediate value for vendor ID.
result = fw_csr_string(directories[i], CSR_DIRECTORY | attr->key, buf,
PAGE_SIZE - 1);
bufsize);
if (result >= 0)
ret = result;
}