From: David Kozub <zub@linux.fjfi.cvut.cz>
To: Jens Axboe <axboe@kernel.dk>,
Jonathan Derrick <jonathan.derrick@intel.com>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>,
David Kozub <zub@linux.fjfi.cvut.cz>
Subject: [PATCH v2 03/16] block: sed-opal: unify space check in add_token_*
Date: Thu, 17 Jan 2019 22:31:43 +0100 [thread overview]
Message-ID: <1547760716-7304-4-git-send-email-zub@linux.fjfi.cvut.cz> (raw)
In-Reply-To: <1547760716-7304-1-git-send-email-zub@linux.fjfi.cvut.cz>
From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
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.
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>
---
block/sed-opal.c | 30 +++++++++++++++++++++---------
1 file changed, 21 insertions(+), 9 deletions(-)
diff --git a/block/sed-opal.c b/block/sed-opal.c
index 5c123a5b4ab1..980705681806 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -510,15 +510,29 @@ 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 size_t remaining_size(struct opal_dev *cmd)
+{
+ return IO_BUFFER_LENGTH - cmd->pos;
+}
+
+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 (remaining_size(cmd) < 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;
}
@@ -563,9 +577,8 @@ 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);
@@ -587,9 +600,8 @@ 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;
}
--
2.20.1
next prev parent reply other threads:[~2019-01-17 21:33 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-17 21:31 [PATCH v2 00/16] block: sed-opal: support shadow MBR done flag and write David Kozub
2019-01-17 21:31 ` [PATCH v2 01/16] block: sed-opal: fix typos and formatting David Kozub
2019-01-17 21:31 ` [PATCH v2 02/16] block: sed-opal: use correct macro for method length David Kozub
2019-01-17 21:31 ` David Kozub [this message]
2019-01-17 21:31 ` [PATCH v2 04/16] block: sed-opal: close parameter list in cmd_finalize David Kozub
2019-01-17 21:31 ` [PATCH v2 05/16] block: sed-opal: unify cmd start David Kozub
2019-01-17 21:31 ` [PATCH v2 06/16] block: sed-opal: unify error handling of responses David Kozub
2019-01-17 21:31 ` [PATCH v2 07/16] block: sed-opal: reuse response_get_token to decrease code duplication David Kozub
2019-01-17 21:31 ` [PATCH v2 08/16] block: sed-opal: print failed function address David Kozub
2019-01-17 21:31 ` [PATCH v2 09/16] block: sed-opal: split generation of bytestring header and content David Kozub
2019-01-17 21:31 ` [PATCH v2 10/16] block: sed-opal: add ioctl for done-mark of shadow mbr David Kozub
2019-01-17 21:31 ` [PATCH v2 11/16] block: sed-opal: ioctl for writing to " David Kozub
2019-01-19 17:15 ` Scott Bauer
2019-01-20 10:27 ` David Kozub
2019-01-20 21:20 ` Scott Bauer
2019-01-17 21:31 ` [PATCH v2 12/16] block: sed-opal: unify retrieval of table columns David Kozub
2019-01-17 21:31 ` [PATCH v2 13/16] block: sed-opal: check size of shadow mbr David Kozub
2019-01-19 17:29 ` Scott Bauer
2019-01-17 21:31 ` [PATCH v2 14/16] block: sed-opal: pass steps via argument rather than via opal_dev David Kozub
2019-01-17 21:31 ` [PATCH v2 15/16] block: sed-opal: don't repeat opal_discovery0 in each steps array David Kozub
2019-01-19 17:46 ` Scott Bauer
2019-01-20 20:23 ` David Kozub
2019-01-17 21:31 ` [PATCH v2 16/16] block: sed-opal: rename next to execute_steps David Kozub
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