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scsi: tcmu: Simplify tcmu_update_uio_info()

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Use 'kasprintf()' instead of:
   - snprintf(NULL, 0...
   - kmalloc(...
   - snprintf(...

This is less verbose and saves 7 bytes (i.e. the space for '/(null)') if
'udev->dev_config' is NULL.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christophe JAILLET 2019-06-16 09:02:20 +02:00 committed by Martin K. Petersen
parent adfbd028e1
commit 22c2f35f49
1 changed files with 7 additions and 9 deletions
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16
drivers/target/target_core_user.c
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@ -1836,21 +1836,19 @@ static int tcmu_update_uio_info(struct tcmu_dev *udev)
{
struct tcmu_hba *hba = udev->hba->hba_ptr;
struct uio_info *info;
size_t size, used;
char *str;
info = &udev->uio_info;
size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name,
udev->dev_config);
size += 1; /* for \0 */
str = kmalloc(size, GFP_KERNEL);
if (udev->dev_config[0])
str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s/%s", hba->host_id,
udev->name, udev->dev_config);
else
str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s", hba->host_id,
udev->name);
if (!str)
return -ENOMEM;
used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name);
if (udev->dev_config[0])
snprintf(str + used, size - used, "/%s", udev->dev_config);
/* If the old string exists, free it */
kfree(info->name);
info->name = str;