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block: sed-opal: unify space check in add_token_* 

All add_token_* functions have a common set of conditions that have to
be checked. Use a common function for those checks in order to avoid
different behaviour as well as code duplication.

Acked-by: Jon Derrick <jonathan.derrick@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>
Co-authored-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jonas Rabenstein 2019-02-14 01:15:56 +01:00 committed by Jens Axboe
parent 1b6b75b013
commit e2821a50b1
1 changed files with 16 additions and 9 deletions
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25
block/sed-opal.c
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@ -510,15 +510,24 @@ static int opal_discovery0(struct opal_dev *dev, void *data)
return opal_discovery0_end(dev);
}
static void add_token_u8(int *err, struct opal_dev *cmd, u8 tok)
static bool can_add(int *err, struct opal_dev *cmd, size_t len)
{
if (*err)
return;
if (cmd->pos >= IO_BUFFER_LENGTH - 1) {
pr_debug("Error adding u8: end of buffer.\n");
return false;
if (len > IO_BUFFER_LENGTH || cmd->pos > IO_BUFFER_LENGTH - len) {
pr_debug("Error adding %zu bytes: end of buffer.\n", len);
*err = -ERANGE;
return;
return false;
}
return true;
}
static void add_token_u8(int *err, struct opal_dev *cmd, u8 tok)
{
if (!can_add(err, cmd, 1))
return;
cmd->cmd[cmd->pos++] = tok;
}
@ -562,9 +571,8 @@ static void add_token_u64(int *err, struct opal_dev *cmd, u64 number)
msb = fls64(number);
len = DIV_ROUND_UP(msb, 8);
if (cmd->pos >= IO_BUFFER_LENGTH - len - 1) {
if (!can_add(err, cmd, len + 1)) {
pr_debug("Error adding u64: end of buffer.\n");
*err = -ERANGE;
return;
}
add_short_atom_header(cmd, false, false, len);
@ -586,9 +594,8 @@ static void add_token_bytestring(int *err, struct opal_dev *cmd,
is_short_atom = false;
}
if (len >= IO_BUFFER_LENGTH - cmd->pos - header_len) {
if (!can_add(err, cmd, header_len + len)) {
pr_debug("Error adding bytestring: end of buffer.\n");
*err = -ERANGE;
return;
}