[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240613212542.403-1-ben@jubnut.com>
Date: Thu, 13 Jun 2024 22:25:42 +0100
From: Ben Walsh <ben@...nut.com>
To: Dan Carpenter <dan.carpenter@...aro.org>,
Benson Leung <bleung@...omium.org>,
Tzung-Bi Shih <tzungbi@...nel.org>,
Guenter Roeck <groeck@...omium.org>,
chrome-platform@...ts.linux.dev,
linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org
Cc: Ben Walsh <ben@...nut.com>
Subject: [PATCH] platform/chrome: cros_ec_lpc: Handle zero length read/write
cros_ec_lpc_mec_read_bytes and cros_ec_lpc_mec_write_bytes call
cros_ec_lpc_mec_in_range, which checks if addresses are in the MEC
address range, and returns -EINVAL if the range given is not sensible.
However cros_ec_lpc_mec_in_range was also returning -EINVAL for a zero
length range.
A zero length range should not be an error condition.
cros_ec_lpc_mec_in_range now returns 1 in this case.
cros_ec_lpc_io_bytes_mec checks for zero length, and returns
immediately without beginning a transfer.
Signed-off-by: Ben Walsh <ben@...nut.com>
---
drivers/platform/chrome/cros_ec_lpc_mec.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/chrome/cros_ec_lpc_mec.c b/drivers/platform/chrome/cros_ec_lpc_mec.c
index dfad934e65ca..a56584171168 100644
--- a/drivers/platform/chrome/cros_ec_lpc_mec.c
+++ b/drivers/platform/chrome/cros_ec_lpc_mec.c
@@ -93,9 +93,6 @@ static void cros_ec_lpc_mec_emi_write_address(u16 addr,
*/
int cros_ec_lpc_mec_in_range(unsigned int offset, unsigned int length)
{
- if (length == 0)
- return -EINVAL;
-
if (WARN_ON(mec_emi_base == 0 || mec_emi_end == 0))
return -EINVAL;
@@ -132,6 +129,9 @@ int cros_ec_lpc_io_bytes_mec(enum cros_ec_lpc_mec_io_type io_type,
enum cros_ec_lpc_mec_emi_access_mode access, new_access;
int ret;
+ if (length == 0)
+ return 0;
+
/* Return checksum of 0 if window is not initialized */
WARN_ON(mec_emi_base == 0 || mec_emi_end == 0);
if (mec_emi_base == 0 || mec_emi_end == 0)
base-commit: 77a714325d09e1527d865dc011ef91c4972ffedd
--
2.45.1
Powered by blists - more mailing lists