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hwmon (occ): Retry for checksum failure 

[ Upstream commit dbed963ed6 ]

Due to the OCC communication design with a shared SRAM area,
checkum errors are expected due to corrupted buffer from OCC
communications with other system components. Therefore, retry
the command twice in the event of a checksum failure.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220426154956.27205-3-eajames@linux.ibm.com
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eddie James 2022-04-26 10:49:56 -05:00 committed by Greg Kroah-Hartman
parent 63a681bcc3
commit fbcf76240a
1 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/hwmon/occ/p9_sbe.c
View File

@ -14,6 +14,8 @@
#include "common.h"
#define OCC_CHECKSUM_RETRIES 3
struct p9_sbe_occ {
struct occ occ;
bool sbe_error;
@ -81,18 +83,23 @@ done:
static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len,
void *resp, size_t resp_len)
{
size_t original_resp_len = resp_len;
struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
int rc;
int rc, i;
rc = fsi_occ_submit(ctx->sbe, cmd, len, resp, &resp_len);
if (rc < 0) {
for (i = 0; i < OCC_CHECKSUM_RETRIES; ++i) {
rc = fsi_occ_submit(ctx->sbe, cmd, len, resp, &resp_len);
if (rc >= 0)
break;
if (resp_len) {
if (p9_sbe_occ_save_ffdc(ctx, resp, resp_len))
sysfs_notify(&occ->bus_dev->kobj, NULL,
bin_attr_ffdc.attr.name);
return rc;
}
return rc;
if (rc != -EBADE)
return rc;
resp_len = original_resp_len;
}
switch (((struct occ_response *)resp)->return_status) {