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[SCSI] fix proc_scsi_write to return "length" on success with remove-single-device case 

Problem spotted by: Suzuki K P <suzuki@in.ibm.com>

A zero return on success isn't correct for filesystem write functions.
They should either return negative error or the length of bytes
consumed.  Add code to convert our zero on success error return to
return the length of bytes passed in.

This fixes the following:

$ echo "scsi remove-single-device 0 0 3 0" > /proc/scsi/scsi
bash: echo: write error: No such device or address"

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley 2006-04-27 14:07:49 -05:00 committed by James Bottomley
parent 665b44aee3
commit 2ca48a1321
1 changed files with 7 additions and 2 deletions
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9
drivers/scsi/scsi_proc.c
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@ -266,8 +266,6 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
lun = simple_strtoul(p + 1, &p, 0);
err = scsi_add_single_device(host, channel, id, lun);
if (err >= 0)
err = length;
/*
* Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
@ -284,6 +282,13 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
err = scsi_remove_single_device(host, channel, id, lun);
}
/*
* convert success returns so that we return the
* number of bytes consumed.
*/
if (!err)
err = length;
out:
free_page((unsigned long)buffer);
return err;